forked from Minki/linux
1525 lines
37 KiB
C
1525 lines
37 KiB
C
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/*
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* Samsung SoC MIPI DSI Master driver.
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*
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* Copyright (c) 2014 Samsung Electronics Co., Ltd
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*
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* Contacts: Tomasz Figa <t.figa@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_mipi_dsi.h>
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#include <drm/drm_panel.h>
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#include <linux/clk.h>
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#include <linux/irq.h>
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#include <linux/phy/phy.h>
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#include <linux/regulator/consumer.h>
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#include <video/mipi_display.h>
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#include <video/videomode.h>
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#include "exynos_drm_drv.h"
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/* returns true iff both arguments logically differs */
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#define NEQV(a, b) (!(a) ^ !(b))
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#define DSIM_STATUS_REG 0x0 /* Status register */
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#define DSIM_SWRST_REG 0x4 /* Software reset register */
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#define DSIM_CLKCTRL_REG 0x8 /* Clock control register */
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#define DSIM_TIMEOUT_REG 0xc /* Time out register */
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#define DSIM_CONFIG_REG 0x10 /* Configuration register */
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#define DSIM_ESCMODE_REG 0x14 /* Escape mode register */
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/* Main display image resolution register */
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#define DSIM_MDRESOL_REG 0x18
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#define DSIM_MVPORCH_REG 0x1c /* Main display Vporch register */
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#define DSIM_MHPORCH_REG 0x20 /* Main display Hporch register */
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#define DSIM_MSYNC_REG 0x24 /* Main display sync area register */
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/* Sub display image resolution register */
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#define DSIM_SDRESOL_REG 0x28
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#define DSIM_INTSRC_REG 0x2c /* Interrupt source register */
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#define DSIM_INTMSK_REG 0x30 /* Interrupt mask register */
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#define DSIM_PKTHDR_REG 0x34 /* Packet Header FIFO register */
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#define DSIM_PAYLOAD_REG 0x38 /* Payload FIFO register */
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#define DSIM_RXFIFO_REG 0x3c /* Read FIFO register */
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#define DSIM_FIFOTHLD_REG 0x40 /* FIFO threshold level register */
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#define DSIM_FIFOCTRL_REG 0x44 /* FIFO status and control register */
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/* FIFO memory AC characteristic register */
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#define DSIM_PLLCTRL_REG 0x4c /* PLL control register */
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#define DSIM_PLLTMR_REG 0x50 /* PLL timer register */
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#define DSIM_PHYACCHR_REG 0x54 /* D-PHY AC characteristic register */
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#define DSIM_PHYACCHR1_REG 0x58 /* D-PHY AC characteristic register1 */
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/* DSIM_STATUS */
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#define DSIM_STOP_STATE_DAT(x) (((x) & 0xf) << 0)
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#define DSIM_STOP_STATE_CLK (1 << 8)
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#define DSIM_TX_READY_HS_CLK (1 << 10)
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#define DSIM_PLL_STABLE (1 << 31)
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/* DSIM_SWRST */
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#define DSIM_FUNCRST (1 << 16)
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#define DSIM_SWRST (1 << 0)
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/* DSIM_TIMEOUT */
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#define DSIM_LPDR_TIMEOUT(x) ((x) << 0)
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#define DSIM_BTA_TIMEOUT(x) ((x) << 16)
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/* DSIM_CLKCTRL */
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#define DSIM_ESC_PRESCALER(x) (((x) & 0xffff) << 0)
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#define DSIM_ESC_PRESCALER_MASK (0xffff << 0)
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#define DSIM_LANE_ESC_CLK_EN_CLK (1 << 19)
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#define DSIM_LANE_ESC_CLK_EN_DATA(x) (((x) & 0xf) << 20)
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#define DSIM_LANE_ESC_CLK_EN_DATA_MASK (0xf << 20)
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#define DSIM_BYTE_CLKEN (1 << 24)
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#define DSIM_BYTE_CLK_SRC(x) (((x) & 0x3) << 25)
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#define DSIM_BYTE_CLK_SRC_MASK (0x3 << 25)
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#define DSIM_PLL_BYPASS (1 << 27)
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#define DSIM_ESC_CLKEN (1 << 28)
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#define DSIM_TX_REQUEST_HSCLK (1 << 31)
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/* DSIM_CONFIG */
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#define DSIM_LANE_EN_CLK (1 << 0)
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#define DSIM_LANE_EN(x) (((x) & 0xf) << 1)
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#define DSIM_NUM_OF_DATA_LANE(x) (((x) & 0x3) << 5)
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#define DSIM_SUB_PIX_FORMAT(x) (((x) & 0x7) << 8)
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#define DSIM_MAIN_PIX_FORMAT_MASK (0x7 << 12)
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#define DSIM_MAIN_PIX_FORMAT_RGB888 (0x7 << 12)
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#define DSIM_MAIN_PIX_FORMAT_RGB666 (0x6 << 12)
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#define DSIM_MAIN_PIX_FORMAT_RGB666_P (0x5 << 12)
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#define DSIM_MAIN_PIX_FORMAT_RGB565 (0x4 << 12)
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#define DSIM_SUB_VC (((x) & 0x3) << 16)
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#define DSIM_MAIN_VC (((x) & 0x3) << 18)
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#define DSIM_HSA_MODE (1 << 20)
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#define DSIM_HBP_MODE (1 << 21)
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#define DSIM_HFP_MODE (1 << 22)
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#define DSIM_HSE_MODE (1 << 23)
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#define DSIM_AUTO_MODE (1 << 24)
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#define DSIM_VIDEO_MODE (1 << 25)
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#define DSIM_BURST_MODE (1 << 26)
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#define DSIM_SYNC_INFORM (1 << 27)
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#define DSIM_EOT_DISABLE (1 << 28)
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#define DSIM_MFLUSH_VS (1 << 29)
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/* DSIM_ESCMODE */
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#define DSIM_TX_TRIGGER_RST (1 << 4)
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#define DSIM_TX_LPDT_LP (1 << 6)
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#define DSIM_CMD_LPDT_LP (1 << 7)
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#define DSIM_FORCE_BTA (1 << 16)
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#define DSIM_FORCE_STOP_STATE (1 << 20)
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#define DSIM_STOP_STATE_CNT(x) (((x) & 0x7ff) << 21)
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#define DSIM_STOP_STATE_CNT_MASK (0x7ff << 21)
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/* DSIM_MDRESOL */
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#define DSIM_MAIN_STAND_BY (1 << 31)
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#define DSIM_MAIN_VRESOL(x) (((x) & 0x7ff) << 16)
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#define DSIM_MAIN_HRESOL(x) (((x) & 0X7ff) << 0)
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/* DSIM_MVPORCH */
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#define DSIM_CMD_ALLOW(x) ((x) << 28)
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#define DSIM_STABLE_VFP(x) ((x) << 16)
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#define DSIM_MAIN_VBP(x) ((x) << 0)
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#define DSIM_CMD_ALLOW_MASK (0xf << 28)
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#define DSIM_STABLE_VFP_MASK (0x7ff << 16)
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#define DSIM_MAIN_VBP_MASK (0x7ff << 0)
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/* DSIM_MHPORCH */
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#define DSIM_MAIN_HFP(x) ((x) << 16)
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#define DSIM_MAIN_HBP(x) ((x) << 0)
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#define DSIM_MAIN_HFP_MASK ((0xffff) << 16)
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#define DSIM_MAIN_HBP_MASK ((0xffff) << 0)
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/* DSIM_MSYNC */
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#define DSIM_MAIN_VSA(x) ((x) << 22)
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#define DSIM_MAIN_HSA(x) ((x) << 0)
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#define DSIM_MAIN_VSA_MASK ((0x3ff) << 22)
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#define DSIM_MAIN_HSA_MASK ((0xffff) << 0)
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/* DSIM_SDRESOL */
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#define DSIM_SUB_STANDY(x) ((x) << 31)
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#define DSIM_SUB_VRESOL(x) ((x) << 16)
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#define DSIM_SUB_HRESOL(x) ((x) << 0)
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#define DSIM_SUB_STANDY_MASK ((0x1) << 31)
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#define DSIM_SUB_VRESOL_MASK ((0x7ff) << 16)
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#define DSIM_SUB_HRESOL_MASK ((0x7ff) << 0)
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/* DSIM_INTSRC */
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#define DSIM_INT_PLL_STABLE (1 << 31)
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#define DSIM_INT_SW_RST_RELEASE (1 << 30)
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#define DSIM_INT_SFR_FIFO_EMPTY (1 << 29)
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#define DSIM_INT_BTA (1 << 25)
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#define DSIM_INT_FRAME_DONE (1 << 24)
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#define DSIM_INT_RX_TIMEOUT (1 << 21)
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#define DSIM_INT_BTA_TIMEOUT (1 << 20)
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#define DSIM_INT_RX_DONE (1 << 18)
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#define DSIM_INT_RX_TE (1 << 17)
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#define DSIM_INT_RX_ACK (1 << 16)
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#define DSIM_INT_RX_ECC_ERR (1 << 15)
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#define DSIM_INT_RX_CRC_ERR (1 << 14)
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/* DSIM_FIFOCTRL */
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#define DSIM_RX_DATA_FULL (1 << 25)
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#define DSIM_RX_DATA_EMPTY (1 << 24)
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#define DSIM_SFR_HEADER_FULL (1 << 23)
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#define DSIM_SFR_HEADER_EMPTY (1 << 22)
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#define DSIM_SFR_PAYLOAD_FULL (1 << 21)
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#define DSIM_SFR_PAYLOAD_EMPTY (1 << 20)
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#define DSIM_I80_HEADER_FULL (1 << 19)
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#define DSIM_I80_HEADER_EMPTY (1 << 18)
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#define DSIM_I80_PAYLOAD_FULL (1 << 17)
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#define DSIM_I80_PAYLOAD_EMPTY (1 << 16)
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#define DSIM_SD_HEADER_FULL (1 << 15)
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#define DSIM_SD_HEADER_EMPTY (1 << 14)
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#define DSIM_SD_PAYLOAD_FULL (1 << 13)
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#define DSIM_SD_PAYLOAD_EMPTY (1 << 12)
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#define DSIM_MD_HEADER_FULL (1 << 11)
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#define DSIM_MD_HEADER_EMPTY (1 << 10)
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#define DSIM_MD_PAYLOAD_FULL (1 << 9)
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#define DSIM_MD_PAYLOAD_EMPTY (1 << 8)
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#define DSIM_RX_FIFO (1 << 4)
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#define DSIM_SFR_FIFO (1 << 3)
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#define DSIM_I80_FIFO (1 << 2)
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#define DSIM_SD_FIFO (1 << 1)
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#define DSIM_MD_FIFO (1 << 0)
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/* DSIM_PHYACCHR */
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#define DSIM_AFC_EN (1 << 14)
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#define DSIM_AFC_CTL(x) (((x) & 0x7) << 5)
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/* DSIM_PLLCTRL */
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#define DSIM_FREQ_BAND(x) ((x) << 24)
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#define DSIM_PLL_EN (1 << 23)
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#define DSIM_PLL_P(x) ((x) << 13)
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#define DSIM_PLL_M(x) ((x) << 4)
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#define DSIM_PLL_S(x) ((x) << 1)
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#define DSI_MAX_BUS_WIDTH 4
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#define DSI_NUM_VIRTUAL_CHANNELS 4
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#define DSI_TX_FIFO_SIZE 2048
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#define DSI_RX_FIFO_SIZE 256
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#define DSI_XFER_TIMEOUT_MS 100
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#define DSI_RX_FIFO_EMPTY 0x30800002
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enum exynos_dsi_transfer_type {
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EXYNOS_DSI_TX,
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EXYNOS_DSI_RX,
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};
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struct exynos_dsi_transfer {
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struct list_head list;
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struct completion completed;
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int result;
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u8 data_id;
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u8 data[2];
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u16 flags;
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const u8 *tx_payload;
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u16 tx_len;
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u16 tx_done;
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u8 *rx_payload;
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u16 rx_len;
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u16 rx_done;
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};
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#define DSIM_STATE_ENABLED BIT(0)
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#define DSIM_STATE_INITIALIZED BIT(1)
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#define DSIM_STATE_CMD_LPM BIT(2)
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struct exynos_dsi {
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struct mipi_dsi_host dsi_host;
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struct drm_connector connector;
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struct drm_encoder *encoder;
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struct device_node *panel_node;
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struct drm_panel *panel;
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struct device *dev;
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void __iomem *reg_base;
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struct phy *phy;
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struct clk *pll_clk;
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struct clk *bus_clk;
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struct regulator_bulk_data supplies[2];
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int irq;
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u32 pll_clk_rate;
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u32 burst_clk_rate;
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u32 esc_clk_rate;
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u32 lanes;
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u32 mode_flags;
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u32 format;
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struct videomode vm;
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int state;
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struct drm_property *brightness;
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struct completion completed;
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spinlock_t transfer_lock; /* protects transfer_list */
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struct list_head transfer_list;
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};
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#define host_to_dsi(host) container_of(host, struct exynos_dsi, dsi_host)
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#define connector_to_dsi(c) container_of(c, struct exynos_dsi, connector)
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static void exynos_dsi_wait_for_reset(struct exynos_dsi *dsi)
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{
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if (wait_for_completion_timeout(&dsi->completed, msecs_to_jiffies(300)))
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return;
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dev_err(dsi->dev, "timeout waiting for reset\n");
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}
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static void exynos_dsi_reset(struct exynos_dsi *dsi)
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{
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reinit_completion(&dsi->completed);
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writel(DSIM_SWRST, dsi->reg_base + DSIM_SWRST_REG);
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}
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#ifndef MHZ
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#define MHZ (1000*1000)
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#endif
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static unsigned long exynos_dsi_pll_find_pms(struct exynos_dsi *dsi,
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unsigned long fin, unsigned long fout, u8 *p, u16 *m, u8 *s)
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{
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unsigned long best_freq = 0;
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u32 min_delta = 0xffffffff;
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u8 p_min, p_max;
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u8 _p, uninitialized_var(best_p);
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u16 _m, uninitialized_var(best_m);
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u8 _s, uninitialized_var(best_s);
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p_min = DIV_ROUND_UP(fin, (12 * MHZ));
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p_max = fin / (6 * MHZ);
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for (_p = p_min; _p <= p_max; ++_p) {
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for (_s = 0; _s <= 5; ++_s) {
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u64 tmp;
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u32 delta;
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tmp = (u64)fout * (_p << _s);
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do_div(tmp, fin);
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_m = tmp;
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if (_m < 41 || _m > 125)
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continue;
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tmp = (u64)_m * fin;
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do_div(tmp, _p);
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if (tmp < 500 * MHZ || tmp > 1000 * MHZ)
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continue;
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tmp = (u64)_m * fin;
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do_div(tmp, _p << _s);
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delta = abs(fout - tmp);
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if (delta < min_delta) {
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best_p = _p;
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best_m = _m;
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best_s = _s;
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min_delta = delta;
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best_freq = tmp;
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}
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}
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}
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if (best_freq) {
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*p = best_p;
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*m = best_m;
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*s = best_s;
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}
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return best_freq;
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}
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static unsigned long exynos_dsi_set_pll(struct exynos_dsi *dsi,
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unsigned long freq)
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{
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static const unsigned long freq_bands[] = {
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100 * MHZ, 120 * MHZ, 160 * MHZ, 200 * MHZ,
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270 * MHZ, 320 * MHZ, 390 * MHZ, 450 * MHZ,
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510 * MHZ, 560 * MHZ, 640 * MHZ, 690 * MHZ,
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770 * MHZ, 870 * MHZ, 950 * MHZ,
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};
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unsigned long fin, fout;
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int timeout, band;
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u8 p, s;
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u16 m;
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u32 reg;
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clk_set_rate(dsi->pll_clk, dsi->pll_clk_rate);
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fin = clk_get_rate(dsi->pll_clk);
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if (!fin) {
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dev_err(dsi->dev, "failed to get PLL clock frequency\n");
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return 0;
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}
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dev_dbg(dsi->dev, "PLL input frequency: %lu\n", fin);
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fout = exynos_dsi_pll_find_pms(dsi, fin, freq, &p, &m, &s);
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if (!fout) {
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dev_err(dsi->dev,
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"failed to find PLL PMS for requested frequency\n");
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return -EFAULT;
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}
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for (band = 0; band < ARRAY_SIZE(freq_bands); ++band)
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if (fout < freq_bands[band])
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break;
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||
|
dev_dbg(dsi->dev, "PLL freq %lu, (p %d, m %d, s %d), band %d\n", fout,
|
||
|
p, m, s, band);
|
||
|
|
||
|
writel(500, dsi->reg_base + DSIM_PLLTMR_REG);
|
||
|
|
||
|
reg = DSIM_FREQ_BAND(band) | DSIM_PLL_EN
|
||
|
| DSIM_PLL_P(p) | DSIM_PLL_M(m) | DSIM_PLL_S(s);
|
||
|
writel(reg, dsi->reg_base + DSIM_PLLCTRL_REG);
|
||
|
|
||
|
timeout = 1000;
|
||
|
do {
|
||
|
if (timeout-- == 0) {
|
||
|
dev_err(dsi->dev, "PLL failed to stabilize\n");
|
||
|
return -EFAULT;
|
||
|
}
|
||
|
reg = readl(dsi->reg_base + DSIM_STATUS_REG);
|
||
|
} while ((reg & DSIM_PLL_STABLE) == 0);
|
||
|
|
||
|
return fout;
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_enable_clock(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
unsigned long hs_clk, byte_clk, esc_clk;
|
||
|
unsigned long esc_div;
|
||
|
u32 reg;
|
||
|
|
||
|
hs_clk = exynos_dsi_set_pll(dsi, dsi->burst_clk_rate);
|
||
|
if (!hs_clk) {
|
||
|
dev_err(dsi->dev, "failed to configure DSI PLL\n");
|
||
|
return -EFAULT;
|
||
|
}
|
||
|
|
||
|
byte_clk = hs_clk / 8;
|
||
|
esc_div = DIV_ROUND_UP(byte_clk, dsi->esc_clk_rate);
|
||
|
esc_clk = byte_clk / esc_div;
|
||
|
|
||
|
if (esc_clk > 20 * MHZ) {
|
||
|
++esc_div;
|
||
|
esc_clk = byte_clk / esc_div;
|
||
|
}
|
||
|
|
||
|
dev_dbg(dsi->dev, "hs_clk = %lu, byte_clk = %lu, esc_clk = %lu\n",
|
||
|
hs_clk, byte_clk, esc_clk);
|
||
|
|
||
|
reg = readl(dsi->reg_base + DSIM_CLKCTRL_REG);
|
||
|
reg &= ~(DSIM_ESC_PRESCALER_MASK | DSIM_LANE_ESC_CLK_EN_CLK
|
||
|
| DSIM_LANE_ESC_CLK_EN_DATA_MASK | DSIM_PLL_BYPASS
|
||
|
| DSIM_BYTE_CLK_SRC_MASK);
|
||
|
reg |= DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN
|
||
|
| DSIM_ESC_PRESCALER(esc_div)
|
||
|
| DSIM_LANE_ESC_CLK_EN_CLK
|
||
|
| DSIM_LANE_ESC_CLK_EN_DATA(BIT(dsi->lanes) - 1)
|
||
|
| DSIM_BYTE_CLK_SRC(0)
|
||
|
| DSIM_TX_REQUEST_HSCLK;
|
||
|
writel(reg, dsi->reg_base + DSIM_CLKCTRL_REG);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_disable_clock(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
u32 reg;
|
||
|
|
||
|
reg = readl(dsi->reg_base + DSIM_CLKCTRL_REG);
|
||
|
reg &= ~(DSIM_LANE_ESC_CLK_EN_CLK | DSIM_LANE_ESC_CLK_EN_DATA_MASK
|
||
|
| DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN);
|
||
|
writel(reg, dsi->reg_base + DSIM_CLKCTRL_REG);
|
||
|
|
||
|
reg = readl(dsi->reg_base + DSIM_PLLCTRL_REG);
|
||
|
reg &= ~DSIM_PLL_EN;
|
||
|
writel(reg, dsi->reg_base + DSIM_PLLCTRL_REG);
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_init_link(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
int timeout;
|
||
|
u32 reg;
|
||
|
u32 lanes_mask;
|
||
|
|
||
|
/* Initialize FIFO pointers */
|
||
|
reg = readl(dsi->reg_base + DSIM_FIFOCTRL_REG);
|
||
|
reg &= ~0x1f;
|
||
|
writel(reg, dsi->reg_base + DSIM_FIFOCTRL_REG);
|
||
|
|
||
|
usleep_range(9000, 11000);
|
||
|
|
||
|
reg |= 0x1f;
|
||
|
writel(reg, dsi->reg_base + DSIM_FIFOCTRL_REG);
|
||
|
|
||
|
usleep_range(9000, 11000);
|
||
|
|
||
|
/* DSI configuration */
|
||
|
reg = 0;
|
||
|
|
||
|
if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
|
||
|
reg |= DSIM_VIDEO_MODE;
|
||
|
|
||
|
if (!(dsi->mode_flags & MIPI_DSI_MODE_VSYNC_FLUSH))
|
||
|
reg |= DSIM_MFLUSH_VS;
|
||
|
if (!(dsi->mode_flags & MIPI_DSI_MODE_EOT_PACKET))
|
||
|
reg |= DSIM_EOT_DISABLE;
|
||
|
if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
|
||
|
reg |= DSIM_SYNC_INFORM;
|
||
|
if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
|
||
|
reg |= DSIM_BURST_MODE;
|
||
|
if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_AUTO_VERT)
|
||
|
reg |= DSIM_AUTO_MODE;
|
||
|
if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HSE)
|
||
|
reg |= DSIM_HSE_MODE;
|
||
|
if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HFP))
|
||
|
reg |= DSIM_HFP_MODE;
|
||
|
if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HBP))
|
||
|
reg |= DSIM_HBP_MODE;
|
||
|
if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HSA))
|
||
|
reg |= DSIM_HSA_MODE;
|
||
|
}
|
||
|
|
||
|
switch (dsi->format) {
|
||
|
case MIPI_DSI_FMT_RGB888:
|
||
|
reg |= DSIM_MAIN_PIX_FORMAT_RGB888;
|
||
|
break;
|
||
|
case MIPI_DSI_FMT_RGB666:
|
||
|
reg |= DSIM_MAIN_PIX_FORMAT_RGB666;
|
||
|
break;
|
||
|
case MIPI_DSI_FMT_RGB666_PACKED:
|
||
|
reg |= DSIM_MAIN_PIX_FORMAT_RGB666_P;
|
||
|
break;
|
||
|
case MIPI_DSI_FMT_RGB565:
|
||
|
reg |= DSIM_MAIN_PIX_FORMAT_RGB565;
|
||
|
break;
|
||
|
default:
|
||
|
dev_err(dsi->dev, "invalid pixel format\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
reg |= DSIM_NUM_OF_DATA_LANE(dsi->lanes - 1);
|
||
|
|
||
|
writel(reg, dsi->reg_base + DSIM_CONFIG_REG);
|
||
|
|
||
|
reg |= DSIM_LANE_EN_CLK;
|
||
|
writel(reg, dsi->reg_base + DSIM_CONFIG_REG);
|
||
|
|
||
|
lanes_mask = BIT(dsi->lanes) - 1;
|
||
|
reg |= DSIM_LANE_EN(lanes_mask);
|
||
|
writel(reg, dsi->reg_base + DSIM_CONFIG_REG);
|
||
|
|
||
|
/* Check clock and data lane state are stop state */
|
||
|
timeout = 100;
|
||
|
do {
|
||
|
if (timeout-- == 0) {
|
||
|
dev_err(dsi->dev, "waiting for bus lanes timed out\n");
|
||
|
return -EFAULT;
|
||
|
}
|
||
|
|
||
|
reg = readl(dsi->reg_base + DSIM_STATUS_REG);
|
||
|
if ((reg & DSIM_STOP_STATE_DAT(lanes_mask))
|
||
|
!= DSIM_STOP_STATE_DAT(lanes_mask))
|
||
|
continue;
|
||
|
} while (!(reg & (DSIM_STOP_STATE_CLK | DSIM_TX_READY_HS_CLK)));
|
||
|
|
||
|
reg = readl(dsi->reg_base + DSIM_ESCMODE_REG);
|
||
|
reg &= ~DSIM_STOP_STATE_CNT_MASK;
|
||
|
reg |= DSIM_STOP_STATE_CNT(0xf);
|
||
|
writel(reg, dsi->reg_base + DSIM_ESCMODE_REG);
|
||
|
|
||
|
reg = DSIM_BTA_TIMEOUT(0xff) | DSIM_LPDR_TIMEOUT(0xffff);
|
||
|
writel(reg, dsi->reg_base + DSIM_TIMEOUT_REG);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_set_display_mode(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
struct videomode *vm = &dsi->vm;
|
||
|
u32 reg;
|
||
|
|
||
|
if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
|
||
|
reg = DSIM_CMD_ALLOW(0xf)
|
||
|
| DSIM_STABLE_VFP(vm->vfront_porch)
|
||
|
| DSIM_MAIN_VBP(vm->vback_porch);
|
||
|
writel(reg, dsi->reg_base + DSIM_MVPORCH_REG);
|
||
|
|
||
|
reg = DSIM_MAIN_HFP(vm->hfront_porch)
|
||
|
| DSIM_MAIN_HBP(vm->hback_porch);
|
||
|
writel(reg, dsi->reg_base + DSIM_MHPORCH_REG);
|
||
|
|
||
|
reg = DSIM_MAIN_VSA(vm->vsync_len)
|
||
|
| DSIM_MAIN_HSA(vm->hsync_len);
|
||
|
writel(reg, dsi->reg_base + DSIM_MSYNC_REG);
|
||
|
}
|
||
|
|
||
|
reg = DSIM_MAIN_HRESOL(vm->hactive) | DSIM_MAIN_VRESOL(vm->vactive);
|
||
|
writel(reg, dsi->reg_base + DSIM_MDRESOL_REG);
|
||
|
|
||
|
dev_dbg(dsi->dev, "LCD size = %dx%d\n", vm->hactive, vm->vactive);
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_set_display_enable(struct exynos_dsi *dsi, bool enable)
|
||
|
{
|
||
|
u32 reg;
|
||
|
|
||
|
reg = readl(dsi->reg_base + DSIM_MDRESOL_REG);
|
||
|
if (enable)
|
||
|
reg |= DSIM_MAIN_STAND_BY;
|
||
|
else
|
||
|
reg &= ~DSIM_MAIN_STAND_BY;
|
||
|
writel(reg, dsi->reg_base + DSIM_MDRESOL_REG);
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_wait_for_hdr_fifo(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
int timeout = 2000;
|
||
|
|
||
|
do {
|
||
|
u32 reg = readl(dsi->reg_base + DSIM_FIFOCTRL_REG);
|
||
|
|
||
|
if (!(reg & DSIM_SFR_HEADER_FULL))
|
||
|
return 0;
|
||
|
|
||
|
if (!cond_resched())
|
||
|
usleep_range(950, 1050);
|
||
|
} while (--timeout);
|
||
|
|
||
|
return -ETIMEDOUT;
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_set_cmd_lpm(struct exynos_dsi *dsi, bool lpm)
|
||
|
{
|
||
|
u32 v = readl(dsi->reg_base + DSIM_ESCMODE_REG);
|
||
|
|
||
|
if (lpm)
|
||
|
v |= DSIM_CMD_LPDT_LP;
|
||
|
else
|
||
|
v &= ~DSIM_CMD_LPDT_LP;
|
||
|
|
||
|
writel(v, dsi->reg_base + DSIM_ESCMODE_REG);
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_force_bta(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
u32 v = readl(dsi->reg_base + DSIM_ESCMODE_REG);
|
||
|
|
||
|
v |= DSIM_FORCE_BTA;
|
||
|
writel(v, dsi->reg_base + DSIM_ESCMODE_REG);
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_send_to_fifo(struct exynos_dsi *dsi,
|
||
|
struct exynos_dsi_transfer *xfer)
|
||
|
{
|
||
|
struct device *dev = dsi->dev;
|
||
|
const u8 *payload = xfer->tx_payload + xfer->tx_done;
|
||
|
u16 length = xfer->tx_len - xfer->tx_done;
|
||
|
bool first = !xfer->tx_done;
|
||
|
u32 reg;
|
||
|
|
||
|
dev_dbg(dev, "< xfer %p: tx len %u, done %u, rx len %u, done %u\n",
|
||
|
xfer, xfer->tx_len, xfer->tx_done, xfer->rx_len, xfer->rx_done);
|
||
|
|
||
|
if (length > DSI_TX_FIFO_SIZE)
|
||
|
length = DSI_TX_FIFO_SIZE;
|
||
|
|
||
|
xfer->tx_done += length;
|
||
|
|
||
|
/* Send payload */
|
||
|
while (length >= 4) {
|
||
|
reg = (payload[3] << 24) | (payload[2] << 16)
|
||
|
| (payload[1] << 8) | payload[0];
|
||
|
writel(reg, dsi->reg_base + DSIM_PAYLOAD_REG);
|
||
|
payload += 4;
|
||
|
length -= 4;
|
||
|
}
|
||
|
|
||
|
reg = 0;
|
||
|
switch (length) {
|
||
|
case 3:
|
||
|
reg |= payload[2] << 16;
|
||
|
/* Fall through */
|
||
|
case 2:
|
||
|
reg |= payload[1] << 8;
|
||
|
/* Fall through */
|
||
|
case 1:
|
||
|
reg |= payload[0];
|
||
|
writel(reg, dsi->reg_base + DSIM_PAYLOAD_REG);
|
||
|
break;
|
||
|
case 0:
|
||
|
/* Do nothing */
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
/* Send packet header */
|
||
|
if (!first)
|
||
|
return;
|
||
|
|
||
|
reg = (xfer->data[1] << 16) | (xfer->data[0] << 8) | xfer->data_id;
|
||
|
if (exynos_dsi_wait_for_hdr_fifo(dsi)) {
|
||
|
dev_err(dev, "waiting for header FIFO timed out\n");
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if (NEQV(xfer->flags & MIPI_DSI_MSG_USE_LPM,
|
||
|
dsi->state & DSIM_STATE_CMD_LPM)) {
|
||
|
exynos_dsi_set_cmd_lpm(dsi, xfer->flags & MIPI_DSI_MSG_USE_LPM);
|
||
|
dsi->state ^= DSIM_STATE_CMD_LPM;
|
||
|
}
|
||
|
|
||
|
writel(reg, dsi->reg_base + DSIM_PKTHDR_REG);
|
||
|
|
||
|
if (xfer->flags & MIPI_DSI_MSG_REQ_ACK)
|
||
|
exynos_dsi_force_bta(dsi);
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_read_from_fifo(struct exynos_dsi *dsi,
|
||
|
struct exynos_dsi_transfer *xfer)
|
||
|
{
|
||
|
u8 *payload = xfer->rx_payload + xfer->rx_done;
|
||
|
bool first = !xfer->rx_done;
|
||
|
struct device *dev = dsi->dev;
|
||
|
u16 length;
|
||
|
u32 reg;
|
||
|
|
||
|
if (first) {
|
||
|
reg = readl(dsi->reg_base + DSIM_RXFIFO_REG);
|
||
|
|
||
|
switch (reg & 0x3f) {
|
||
|
case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_2BYTE:
|
||
|
case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
|
||
|
if (xfer->rx_len >= 2) {
|
||
|
payload[1] = reg >> 16;
|
||
|
++xfer->rx_done;
|
||
|
}
|
||
|
/* Fall through */
|
||
|
case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE:
|
||
|
case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
|
||
|
payload[0] = reg >> 8;
|
||
|
++xfer->rx_done;
|
||
|
xfer->rx_len = xfer->rx_done;
|
||
|
xfer->result = 0;
|
||
|
goto clear_fifo;
|
||
|
case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
|
||
|
dev_err(dev, "DSI Error Report: 0x%04x\n",
|
||
|
(reg >> 8) & 0xffff);
|
||
|
xfer->result = 0;
|
||
|
goto clear_fifo;
|
||
|
}
|
||
|
|
||
|
length = (reg >> 8) & 0xffff;
|
||
|
if (length > xfer->rx_len) {
|
||
|
dev_err(dev,
|
||
|
"response too long (%u > %u bytes), stripping\n",
|
||
|
xfer->rx_len, length);
|
||
|
length = xfer->rx_len;
|
||
|
} else if (length < xfer->rx_len)
|
||
|
xfer->rx_len = length;
|
||
|
}
|
||
|
|
||
|
length = xfer->rx_len - xfer->rx_done;
|
||
|
xfer->rx_done += length;
|
||
|
|
||
|
/* Receive payload */
|
||
|
while (length >= 4) {
|
||
|
reg = readl(dsi->reg_base + DSIM_RXFIFO_REG);
|
||
|
payload[0] = (reg >> 0) & 0xff;
|
||
|
payload[1] = (reg >> 8) & 0xff;
|
||
|
payload[2] = (reg >> 16) & 0xff;
|
||
|
payload[3] = (reg >> 24) & 0xff;
|
||
|
payload += 4;
|
||
|
length -= 4;
|
||
|
}
|
||
|
|
||
|
if (length) {
|
||
|
reg = readl(dsi->reg_base + DSIM_RXFIFO_REG);
|
||
|
switch (length) {
|
||
|
case 3:
|
||
|
payload[2] = (reg >> 16) & 0xff;
|
||
|
/* Fall through */
|
||
|
case 2:
|
||
|
payload[1] = (reg >> 8) & 0xff;
|
||
|
/* Fall through */
|
||
|
case 1:
|
||
|
payload[0] = reg & 0xff;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (xfer->rx_done == xfer->rx_len)
|
||
|
xfer->result = 0;
|
||
|
|
||
|
clear_fifo:
|
||
|
length = DSI_RX_FIFO_SIZE / 4;
|
||
|
do {
|
||
|
reg = readl(dsi->reg_base + DSIM_RXFIFO_REG);
|
||
|
if (reg == DSI_RX_FIFO_EMPTY)
|
||
|
break;
|
||
|
} while (--length);
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_transfer_start(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
unsigned long flags;
|
||
|
struct exynos_dsi_transfer *xfer;
|
||
|
bool start = false;
|
||
|
|
||
|
again:
|
||
|
spin_lock_irqsave(&dsi->transfer_lock, flags);
|
||
|
|
||
|
if (list_empty(&dsi->transfer_list)) {
|
||
|
spin_unlock_irqrestore(&dsi->transfer_lock, flags);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
xfer = list_first_entry(&dsi->transfer_list,
|
||
|
struct exynos_dsi_transfer, list);
|
||
|
|
||
|
spin_unlock_irqrestore(&dsi->transfer_lock, flags);
|
||
|
|
||
|
if (xfer->tx_len && xfer->tx_done == xfer->tx_len)
|
||
|
/* waiting for RX */
|
||
|
return;
|
||
|
|
||
|
exynos_dsi_send_to_fifo(dsi, xfer);
|
||
|
|
||
|
if (xfer->tx_len || xfer->rx_len)
|
||
|
return;
|
||
|
|
||
|
xfer->result = 0;
|
||
|
complete(&xfer->completed);
|
||
|
|
||
|
spin_lock_irqsave(&dsi->transfer_lock, flags);
|
||
|
|
||
|
list_del_init(&xfer->list);
|
||
|
start = !list_empty(&dsi->transfer_list);
|
||
|
|
||
|
spin_unlock_irqrestore(&dsi->transfer_lock, flags);
|
||
|
|
||
|
if (start)
|
||
|
goto again;
|
||
|
}
|
||
|
|
||
|
static bool exynos_dsi_transfer_finish(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
struct exynos_dsi_transfer *xfer;
|
||
|
unsigned long flags;
|
||
|
bool start = true;
|
||
|
|
||
|
spin_lock_irqsave(&dsi->transfer_lock, flags);
|
||
|
|
||
|
if (list_empty(&dsi->transfer_list)) {
|
||
|
spin_unlock_irqrestore(&dsi->transfer_lock, flags);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
xfer = list_first_entry(&dsi->transfer_list,
|
||
|
struct exynos_dsi_transfer, list);
|
||
|
|
||
|
spin_unlock_irqrestore(&dsi->transfer_lock, flags);
|
||
|
|
||
|
dev_dbg(dsi->dev,
|
||
|
"> xfer %p, tx_len %u, tx_done %u, rx_len %u, rx_done %u\n",
|
||
|
xfer, xfer->tx_len, xfer->tx_done, xfer->rx_len, xfer->rx_done);
|
||
|
|
||
|
if (xfer->tx_done != xfer->tx_len)
|
||
|
return true;
|
||
|
|
||
|
if (xfer->rx_done != xfer->rx_len)
|
||
|
exynos_dsi_read_from_fifo(dsi, xfer);
|
||
|
|
||
|
if (xfer->rx_done != xfer->rx_len)
|
||
|
return true;
|
||
|
|
||
|
spin_lock_irqsave(&dsi->transfer_lock, flags);
|
||
|
|
||
|
list_del_init(&xfer->list);
|
||
|
start = !list_empty(&dsi->transfer_list);
|
||
|
|
||
|
spin_unlock_irqrestore(&dsi->transfer_lock, flags);
|
||
|
|
||
|
if (!xfer->rx_len)
|
||
|
xfer->result = 0;
|
||
|
complete(&xfer->completed);
|
||
|
|
||
|
return start;
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_remove_transfer(struct exynos_dsi *dsi,
|
||
|
struct exynos_dsi_transfer *xfer)
|
||
|
{
|
||
|
unsigned long flags;
|
||
|
bool start;
|
||
|
|
||
|
spin_lock_irqsave(&dsi->transfer_lock, flags);
|
||
|
|
||
|
if (!list_empty(&dsi->transfer_list) &&
|
||
|
xfer == list_first_entry(&dsi->transfer_list,
|
||
|
struct exynos_dsi_transfer, list)) {
|
||
|
list_del_init(&xfer->list);
|
||
|
start = !list_empty(&dsi->transfer_list);
|
||
|
spin_unlock_irqrestore(&dsi->transfer_lock, flags);
|
||
|
if (start)
|
||
|
exynos_dsi_transfer_start(dsi);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
list_del_init(&xfer->list);
|
||
|
|
||
|
spin_unlock_irqrestore(&dsi->transfer_lock, flags);
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_transfer(struct exynos_dsi *dsi,
|
||
|
struct exynos_dsi_transfer *xfer)
|
||
|
{
|
||
|
unsigned long flags;
|
||
|
bool stopped;
|
||
|
|
||
|
xfer->tx_done = 0;
|
||
|
xfer->rx_done = 0;
|
||
|
xfer->result = -ETIMEDOUT;
|
||
|
init_completion(&xfer->completed);
|
||
|
|
||
|
spin_lock_irqsave(&dsi->transfer_lock, flags);
|
||
|
|
||
|
stopped = list_empty(&dsi->transfer_list);
|
||
|
list_add_tail(&xfer->list, &dsi->transfer_list);
|
||
|
|
||
|
spin_unlock_irqrestore(&dsi->transfer_lock, flags);
|
||
|
|
||
|
if (stopped)
|
||
|
exynos_dsi_transfer_start(dsi);
|
||
|
|
||
|
wait_for_completion_timeout(&xfer->completed,
|
||
|
msecs_to_jiffies(DSI_XFER_TIMEOUT_MS));
|
||
|
if (xfer->result == -ETIMEDOUT) {
|
||
|
exynos_dsi_remove_transfer(dsi, xfer);
|
||
|
dev_err(dsi->dev, "xfer timed out: %*ph %*ph\n", 2, xfer->data,
|
||
|
xfer->tx_len, xfer->tx_payload);
|
||
|
return -ETIMEDOUT;
|
||
|
}
|
||
|
|
||
|
/* Also covers hardware timeout condition */
|
||
|
return xfer->result;
|
||
|
}
|
||
|
|
||
|
static irqreturn_t exynos_dsi_irq(int irq, void *dev_id)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = dev_id;
|
||
|
u32 status;
|
||
|
|
||
|
status = readl(dsi->reg_base + DSIM_INTSRC_REG);
|
||
|
if (!status) {
|
||
|
static unsigned long int j;
|
||
|
if (printk_timed_ratelimit(&j, 500))
|
||
|
dev_warn(dsi->dev, "spurious interrupt\n");
|
||
|
return IRQ_HANDLED;
|
||
|
}
|
||
|
writel(status, dsi->reg_base + DSIM_INTSRC_REG);
|
||
|
|
||
|
if (status & DSIM_INT_SW_RST_RELEASE) {
|
||
|
u32 mask = ~(DSIM_INT_RX_DONE | DSIM_INT_SFR_FIFO_EMPTY);
|
||
|
writel(mask, dsi->reg_base + DSIM_INTMSK_REG);
|
||
|
complete(&dsi->completed);
|
||
|
return IRQ_HANDLED;
|
||
|
}
|
||
|
|
||
|
if (!(status & (DSIM_INT_RX_DONE | DSIM_INT_SFR_FIFO_EMPTY)))
|
||
|
return IRQ_HANDLED;
|
||
|
|
||
|
if (exynos_dsi_transfer_finish(dsi))
|
||
|
exynos_dsi_transfer_start(dsi);
|
||
|
|
||
|
return IRQ_HANDLED;
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_init(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
exynos_dsi_enable_clock(dsi);
|
||
|
exynos_dsi_reset(dsi);
|
||
|
enable_irq(dsi->irq);
|
||
|
exynos_dsi_wait_for_reset(dsi);
|
||
|
exynos_dsi_init_link(dsi);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
|
||
|
struct mipi_dsi_device *device)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = host_to_dsi(host);
|
||
|
|
||
|
dsi->lanes = device->lanes;
|
||
|
dsi->format = device->format;
|
||
|
dsi->mode_flags = device->mode_flags;
|
||
|
dsi->panel_node = device->dev.of_node;
|
||
|
|
||
|
if (dsi->connector.dev)
|
||
|
drm_helper_hpd_irq_event(dsi->connector.dev);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
|
||
|
struct mipi_dsi_device *device)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = host_to_dsi(host);
|
||
|
|
||
|
dsi->panel_node = NULL;
|
||
|
|
||
|
if (dsi->connector.dev)
|
||
|
drm_helper_hpd_irq_event(dsi->connector.dev);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* distinguish between short and long DSI packet types */
|
||
|
static bool exynos_dsi_is_short_dsi_type(u8 type)
|
||
|
{
|
||
|
return (type & 0x0f) <= 8;
|
||
|
}
|
||
|
|
||
|
static ssize_t exynos_dsi_host_transfer(struct mipi_dsi_host *host,
|
||
|
struct mipi_dsi_msg *msg)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = host_to_dsi(host);
|
||
|
struct exynos_dsi_transfer xfer;
|
||
|
int ret;
|
||
|
|
||
|
if (!(dsi->state & DSIM_STATE_INITIALIZED)) {
|
||
|
ret = exynos_dsi_init(dsi);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
dsi->state |= DSIM_STATE_INITIALIZED;
|
||
|
}
|
||
|
|
||
|
if (msg->tx_len == 0)
|
||
|
return -EINVAL;
|
||
|
|
||
|
xfer.data_id = msg->type | (msg->channel << 6);
|
||
|
|
||
|
if (exynos_dsi_is_short_dsi_type(msg->type)) {
|
||
|
const char *tx_buf = msg->tx_buf;
|
||
|
|
||
|
if (msg->tx_len > 2)
|
||
|
return -EINVAL;
|
||
|
xfer.tx_len = 0;
|
||
|
xfer.data[0] = tx_buf[0];
|
||
|
xfer.data[1] = (msg->tx_len == 2) ? tx_buf[1] : 0;
|
||
|
} else {
|
||
|
xfer.tx_len = msg->tx_len;
|
||
|
xfer.data[0] = msg->tx_len & 0xff;
|
||
|
xfer.data[1] = msg->tx_len >> 8;
|
||
|
xfer.tx_payload = msg->tx_buf;
|
||
|
}
|
||
|
|
||
|
xfer.rx_len = msg->rx_len;
|
||
|
xfer.rx_payload = msg->rx_buf;
|
||
|
xfer.flags = msg->flags;
|
||
|
|
||
|
ret = exynos_dsi_transfer(dsi, &xfer);
|
||
|
return (ret < 0) ? ret : xfer.rx_done;
|
||
|
}
|
||
|
|
||
|
static const struct mipi_dsi_host_ops exynos_dsi_ops = {
|
||
|
.attach = exynos_dsi_host_attach,
|
||
|
.detach = exynos_dsi_host_detach,
|
||
|
.transfer = exynos_dsi_host_transfer,
|
||
|
};
|
||
|
|
||
|
static int exynos_dsi_poweron(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
int ret;
|
||
|
|
||
|
ret = regulator_bulk_enable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
|
||
|
if (ret < 0) {
|
||
|
dev_err(dsi->dev, "cannot enable regulators %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
ret = clk_prepare_enable(dsi->bus_clk);
|
||
|
if (ret < 0) {
|
||
|
dev_err(dsi->dev, "cannot enable bus clock %d\n", ret);
|
||
|
goto err_bus_clk;
|
||
|
}
|
||
|
|
||
|
ret = clk_prepare_enable(dsi->pll_clk);
|
||
|
if (ret < 0) {
|
||
|
dev_err(dsi->dev, "cannot enable pll clock %d\n", ret);
|
||
|
goto err_pll_clk;
|
||
|
}
|
||
|
|
||
|
ret = phy_power_on(dsi->phy);
|
||
|
if (ret < 0) {
|
||
|
dev_err(dsi->dev, "cannot enable phy %d\n", ret);
|
||
|
goto err_phy;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
err_phy:
|
||
|
clk_disable_unprepare(dsi->pll_clk);
|
||
|
err_pll_clk:
|
||
|
clk_disable_unprepare(dsi->bus_clk);
|
||
|
err_bus_clk:
|
||
|
regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_poweroff(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
int ret;
|
||
|
|
||
|
usleep_range(10000, 20000);
|
||
|
|
||
|
if (dsi->state & DSIM_STATE_INITIALIZED) {
|
||
|
dsi->state &= ~DSIM_STATE_INITIALIZED;
|
||
|
|
||
|
exynos_dsi_disable_clock(dsi);
|
||
|
|
||
|
disable_irq(dsi->irq);
|
||
|
}
|
||
|
|
||
|
dsi->state &= ~DSIM_STATE_CMD_LPM;
|
||
|
|
||
|
phy_power_off(dsi->phy);
|
||
|
|
||
|
clk_disable_unprepare(dsi->pll_clk);
|
||
|
clk_disable_unprepare(dsi->bus_clk);
|
||
|
|
||
|
ret = regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
|
||
|
if (ret < 0)
|
||
|
dev_err(dsi->dev, "cannot disable regulators %d\n", ret);
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_enable(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
int ret;
|
||
|
|
||
|
if (dsi->state & DSIM_STATE_ENABLED)
|
||
|
return 0;
|
||
|
|
||
|
ret = exynos_dsi_poweron(dsi);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
ret = drm_panel_enable(dsi->panel);
|
||
|
if (ret < 0) {
|
||
|
exynos_dsi_poweroff(dsi);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
exynos_dsi_set_display_mode(dsi);
|
||
|
exynos_dsi_set_display_enable(dsi, true);
|
||
|
|
||
|
dsi->state |= DSIM_STATE_ENABLED;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_disable(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
if (!(dsi->state & DSIM_STATE_ENABLED))
|
||
|
return;
|
||
|
|
||
|
exynos_dsi_set_display_enable(dsi, false);
|
||
|
drm_panel_disable(dsi->panel);
|
||
|
exynos_dsi_poweroff(dsi);
|
||
|
|
||
|
dsi->state &= ~DSIM_STATE_ENABLED;
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_dpms(struct exynos_drm_display *display, int mode)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = display->ctx;
|
||
|
|
||
|
if (dsi->panel) {
|
||
|
switch (mode) {
|
||
|
case DRM_MODE_DPMS_ON:
|
||
|
exynos_dsi_enable(dsi);
|
||
|
break;
|
||
|
case DRM_MODE_DPMS_STANDBY:
|
||
|
case DRM_MODE_DPMS_SUSPEND:
|
||
|
case DRM_MODE_DPMS_OFF:
|
||
|
exynos_dsi_disable(dsi);
|
||
|
break;
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static enum drm_connector_status
|
||
|
exynos_dsi_detect(struct drm_connector *connector, bool force)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = connector_to_dsi(connector);
|
||
|
|
||
|
if (!dsi->panel) {
|
||
|
dsi->panel = of_drm_find_panel(dsi->panel_node);
|
||
|
if (dsi->panel)
|
||
|
drm_panel_attach(dsi->panel, &dsi->connector);
|
||
|
} else if (!dsi->panel_node) {
|
||
|
struct exynos_drm_display *display;
|
||
|
|
||
|
display = platform_get_drvdata(to_platform_device(dsi->dev));
|
||
|
exynos_dsi_dpms(display, DRM_MODE_DPMS_OFF);
|
||
|
drm_panel_detach(dsi->panel);
|
||
|
dsi->panel = NULL;
|
||
|
}
|
||
|
|
||
|
if (dsi->panel)
|
||
|
return connector_status_connected;
|
||
|
|
||
|
return connector_status_disconnected;
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_connector_destroy(struct drm_connector *connector)
|
||
|
{
|
||
|
}
|
||
|
|
||
|
static struct drm_connector_funcs exynos_dsi_connector_funcs = {
|
||
|
.dpms = drm_helper_connector_dpms,
|
||
|
.detect = exynos_dsi_detect,
|
||
|
.fill_modes = drm_helper_probe_single_connector_modes,
|
||
|
.destroy = exynos_dsi_connector_destroy,
|
||
|
};
|
||
|
|
||
|
static int exynos_dsi_get_modes(struct drm_connector *connector)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = connector_to_dsi(connector);
|
||
|
|
||
|
if (dsi->panel)
|
||
|
return dsi->panel->funcs->get_modes(dsi->panel);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_mode_valid(struct drm_connector *connector,
|
||
|
struct drm_display_mode *mode)
|
||
|
{
|
||
|
return MODE_OK;
|
||
|
}
|
||
|
|
||
|
static struct drm_encoder *
|
||
|
exynos_dsi_best_encoder(struct drm_connector *connector)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = connector_to_dsi(connector);
|
||
|
|
||
|
return dsi->encoder;
|
||
|
}
|
||
|
|
||
|
static struct drm_connector_helper_funcs exynos_dsi_connector_helper_funcs = {
|
||
|
.get_modes = exynos_dsi_get_modes,
|
||
|
.mode_valid = exynos_dsi_mode_valid,
|
||
|
.best_encoder = exynos_dsi_best_encoder,
|
||
|
};
|
||
|
|
||
|
static int exynos_dsi_create_connector(struct exynos_drm_display *display,
|
||
|
struct drm_encoder *encoder)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = display->ctx;
|
||
|
struct drm_connector *connector = &dsi->connector;
|
||
|
int ret;
|
||
|
|
||
|
dsi->encoder = encoder;
|
||
|
|
||
|
connector->polled = DRM_CONNECTOR_POLL_HPD;
|
||
|
|
||
|
ret = drm_connector_init(encoder->dev, connector,
|
||
|
&exynos_dsi_connector_funcs,
|
||
|
DRM_MODE_CONNECTOR_DSI);
|
||
|
if (ret) {
|
||
|
DRM_ERROR("Failed to initialize connector with drm\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
drm_connector_helper_add(connector, &exynos_dsi_connector_helper_funcs);
|
||
|
drm_sysfs_connector_add(connector);
|
||
|
drm_mode_connector_attach_encoder(connector, encoder);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void exynos_dsi_mode_set(struct exynos_drm_display *display,
|
||
|
struct drm_display_mode *mode)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = display->ctx;
|
||
|
struct videomode *vm = &dsi->vm;
|
||
|
|
||
|
vm->hactive = mode->hdisplay;
|
||
|
vm->vactive = mode->vdisplay;
|
||
|
vm->vfront_porch = mode->vsync_start - mode->vdisplay;
|
||
|
vm->vback_porch = mode->vtotal - mode->vsync_end;
|
||
|
vm->vsync_len = mode->vsync_end - mode->vsync_start;
|
||
|
vm->hfront_porch = mode->hsync_start - mode->hdisplay;
|
||
|
vm->hback_porch = mode->htotal - mode->hsync_end;
|
||
|
vm->hsync_len = mode->hsync_end - mode->hsync_start;
|
||
|
}
|
||
|
|
||
|
static struct exynos_drm_display_ops exynos_dsi_display_ops = {
|
||
|
.create_connector = exynos_dsi_create_connector,
|
||
|
.mode_set = exynos_dsi_mode_set,
|
||
|
.dpms = exynos_dsi_dpms
|
||
|
};
|
||
|
|
||
|
static struct exynos_drm_display exynos_dsi_display = {
|
||
|
.type = EXYNOS_DISPLAY_TYPE_LCD,
|
||
|
.ops = &exynos_dsi_display_ops,
|
||
|
};
|
||
|
|
||
|
/* of_* functions will be removed after merge of of_graph patches */
|
||
|
static struct device_node *
|
||
|
of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg)
|
||
|
{
|
||
|
struct device_node *np;
|
||
|
|
||
|
for_each_child_of_node(parent, np) {
|
||
|
u32 r;
|
||
|
|
||
|
if (!np->name || of_node_cmp(np->name, name))
|
||
|
continue;
|
||
|
|
||
|
if (of_property_read_u32(np, "reg", &r) < 0)
|
||
|
r = 0;
|
||
|
|
||
|
if (reg == r)
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
return np;
|
||
|
}
|
||
|
|
||
|
static struct device_node *of_graph_get_port_by_reg(struct device_node *parent,
|
||
|
u32 reg)
|
||
|
{
|
||
|
struct device_node *ports, *port;
|
||
|
|
||
|
ports = of_get_child_by_name(parent, "ports");
|
||
|
if (ports)
|
||
|
parent = ports;
|
||
|
|
||
|
port = of_get_child_by_name_reg(parent, "port", reg);
|
||
|
|
||
|
of_node_put(ports);
|
||
|
|
||
|
return port;
|
||
|
}
|
||
|
|
||
|
static struct device_node *
|
||
|
of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg)
|
||
|
{
|
||
|
return of_get_child_by_name_reg(port, "endpoint", reg);
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_of_read_u32(const struct device_node *np,
|
||
|
const char *propname, u32 *out_value)
|
||
|
{
|
||
|
int ret = of_property_read_u32(np, propname, out_value);
|
||
|
|
||
|
if (ret < 0)
|
||
|
pr_err("%s: failed to get '%s' property\n", np->full_name,
|
||
|
propname);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
enum {
|
||
|
DSI_PORT_IN,
|
||
|
DSI_PORT_OUT
|
||
|
};
|
||
|
|
||
|
static int exynos_dsi_parse_dt(struct exynos_dsi *dsi)
|
||
|
{
|
||
|
struct device *dev = dsi->dev;
|
||
|
struct device_node *node = dev->of_node;
|
||
|
struct device_node *port, *ep;
|
||
|
int ret;
|
||
|
|
||
|
ret = exynos_dsi_of_read_u32(node, "samsung,pll-clock-frequency",
|
||
|
&dsi->pll_clk_rate);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
port = of_graph_get_port_by_reg(node, DSI_PORT_OUT);
|
||
|
if (!port) {
|
||
|
dev_err(dev, "no output port specified\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
ep = of_graph_get_endpoint_by_reg(port, 0);
|
||
|
of_node_put(port);
|
||
|
if (!ep) {
|
||
|
dev_err(dev, "no endpoint specified in output port\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
ret = exynos_dsi_of_read_u32(ep, "samsung,burst-clock-frequency",
|
||
|
&dsi->burst_clk_rate);
|
||
|
if (ret < 0)
|
||
|
goto end;
|
||
|
|
||
|
ret = exynos_dsi_of_read_u32(ep, "samsung,esc-clock-frequency",
|
||
|
&dsi->esc_clk_rate);
|
||
|
|
||
|
end:
|
||
|
of_node_put(ep);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_probe(struct platform_device *pdev)
|
||
|
{
|
||
|
struct resource *res;
|
||
|
struct exynos_dsi *dsi;
|
||
|
int ret;
|
||
|
|
||
|
dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
|
||
|
if (!dsi) {
|
||
|
dev_err(&pdev->dev, "failed to allocate dsi object.\n");
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
|
||
|
init_completion(&dsi->completed);
|
||
|
spin_lock_init(&dsi->transfer_lock);
|
||
|
INIT_LIST_HEAD(&dsi->transfer_list);
|
||
|
|
||
|
dsi->dsi_host.ops = &exynos_dsi_ops;
|
||
|
dsi->dsi_host.dev = &pdev->dev;
|
||
|
|
||
|
dsi->dev = &pdev->dev;
|
||
|
|
||
|
ret = exynos_dsi_parse_dt(dsi);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
dsi->supplies[0].supply = "vddcore";
|
||
|
dsi->supplies[1].supply = "vddio";
|
||
|
ret = devm_regulator_bulk_get(&pdev->dev, ARRAY_SIZE(dsi->supplies),
|
||
|
dsi->supplies);
|
||
|
if (ret) {
|
||
|
dev_info(&pdev->dev, "failed to get regulators: %d\n", ret);
|
||
|
return -EPROBE_DEFER;
|
||
|
}
|
||
|
|
||
|
dsi->pll_clk = devm_clk_get(&pdev->dev, "pll_clk");
|
||
|
if (IS_ERR(dsi->pll_clk)) {
|
||
|
dev_info(&pdev->dev, "failed to get dsi pll input clock\n");
|
||
|
return -EPROBE_DEFER;
|
||
|
}
|
||
|
|
||
|
dsi->bus_clk = devm_clk_get(&pdev->dev, "bus_clk");
|
||
|
if (IS_ERR(dsi->bus_clk)) {
|
||
|
dev_info(&pdev->dev, "failed to get dsi bus clock\n");
|
||
|
return -EPROBE_DEFER;
|
||
|
}
|
||
|
|
||
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||
|
dsi->reg_base = devm_ioremap_resource(&pdev->dev, res);
|
||
|
if (!dsi->reg_base) {
|
||
|
dev_err(&pdev->dev, "failed to remap io region\n");
|
||
|
return -EADDRNOTAVAIL;
|
||
|
}
|
||
|
|
||
|
dsi->phy = devm_phy_get(&pdev->dev, "dsim");
|
||
|
if (IS_ERR(dsi->phy)) {
|
||
|
dev_info(&pdev->dev, "failed to get dsim phy\n");
|
||
|
return -EPROBE_DEFER;
|
||
|
}
|
||
|
|
||
|
dsi->irq = platform_get_irq(pdev, 0);
|
||
|
if (dsi->irq < 0) {
|
||
|
dev_err(&pdev->dev, "failed to request dsi irq resource\n");
|
||
|
return dsi->irq;
|
||
|
}
|
||
|
|
||
|
irq_set_status_flags(dsi->irq, IRQ_NOAUTOEN);
|
||
|
ret = devm_request_threaded_irq(&pdev->dev, dsi->irq, NULL,
|
||
|
exynos_dsi_irq, IRQF_ONESHOT,
|
||
|
dev_name(&pdev->dev), dsi);
|
||
|
if (ret) {
|
||
|
dev_err(&pdev->dev, "failed to request dsi irq\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
exynos_dsi_display.ctx = dsi;
|
||
|
|
||
|
platform_set_drvdata(pdev, &exynos_dsi_display);
|
||
|
exynos_drm_display_register(&exynos_dsi_display);
|
||
|
|
||
|
return mipi_dsi_host_register(&dsi->dsi_host);
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_remove(struct platform_device *pdev)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = exynos_dsi_display.ctx;
|
||
|
|
||
|
exynos_dsi_dpms(&exynos_dsi_display, DRM_MODE_DPMS_OFF);
|
||
|
|
||
|
exynos_drm_display_unregister(&exynos_dsi_display);
|
||
|
mipi_dsi_host_unregister(&dsi->dsi_host);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
#if CONFIG_PM_SLEEP
|
||
|
static int exynos_dsi_resume(struct device *dev)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = exynos_dsi_display.ctx;
|
||
|
|
||
|
if (dsi->state & DSIM_STATE_ENABLED) {
|
||
|
dsi->state &= ~DSIM_STATE_ENABLED;
|
||
|
exynos_dsi_enable(dsi);
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int exynos_dsi_suspend(struct device *dev)
|
||
|
{
|
||
|
struct exynos_dsi *dsi = exynos_dsi_display.ctx;
|
||
|
|
||
|
if (dsi->state & DSIM_STATE_ENABLED) {
|
||
|
exynos_dsi_disable(dsi);
|
||
|
dsi->state |= DSIM_STATE_ENABLED;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
static const struct dev_pm_ops exynos_dsi_pm_ops = {
|
||
|
SET_SYSTEM_SLEEP_PM_OPS(exynos_dsi_suspend, exynos_dsi_resume)
|
||
|
};
|
||
|
|
||
|
static struct of_device_id exynos_dsi_of_match[] = {
|
||
|
{ .compatible = "samsung,exynos4210-mipi-dsi" },
|
||
|
{ }
|
||
|
};
|
||
|
|
||
|
struct platform_driver dsi_driver = {
|
||
|
.probe = exynos_dsi_probe,
|
||
|
.remove = exynos_dsi_remove,
|
||
|
.driver = {
|
||
|
.name = "exynos-dsi",
|
||
|
.owner = THIS_MODULE,
|
||
|
.pm = &exynos_dsi_pm_ops,
|
||
|
.of_match_table = exynos_dsi_of_match,
|
||
|
},
|
||
|
};
|
||
|
|
||
|
MODULE_AUTHOR("Tomasz Figa <t.figa@samsung.com>");
|
||
|
MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
|
||
|
MODULE_DESCRIPTION("Samsung SoC MIPI DSI Master");
|
||
|
MODULE_LICENSE("GPL v2");
|