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drm: rcar-du: Add Gen3 HDMI encoder support

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The R-Car Gen3 SoCs include on-chip DesignWare HDMI encoders. Support
them with a platform driver to provide platform glue data to the dw-hdmi
driver.

The driver is a complete rewrite of code coming from the Renesas BSP,
save for the values in the PHY parameters table.

Signed-off-by: Koji Matsuoka <koji.matsuoka.xm@renesas.com>
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
This commit is contained in:
Koji Matsuoka 2016-11-11 18:07:40 +01:00 committed by Laurent Pinchart
parent 907c1bbd51
commit 40d0fa7095
3 changed files with 108 additions and 0 deletions
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7
drivers/gpu/drm/rcar-du/Kconfig
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@ -11,6 +11,13 @@ config DRM_RCAR_DU
Choose this option if you have an R-Car chipset.
If M is selected the module will be called rcar-du-drm.
config DRM_RCAR_DW_HDMI
tristate "R-Car DU Gen3 HDMI Encoder Support"
depends on DRM && OF
select DRM_DW_HDMI
help
Enable support for R-Car Gen3 internal HDMI encoder.
config DRM_RCAR_LVDS
bool "R-Car DU LVDS Encoder Support"
depends on DRM_RCAR_DU

1
drivers/gpu/drm/rcar-du/Makefile
View File

@ -11,3 +11,4 @@ rcar-du-drm-$(CONFIG_DRM_RCAR_LVDS) += rcar_du_lvdsenc.o
rcar-du-drm-$(CONFIG_DRM_RCAR_VSP) += rcar_du_vsp.o
obj-$(CONFIG_DRM_RCAR_DU) += rcar-du-drm.o
obj-$(CONFIG_DRM_RCAR_DW_HDMI) += rcar_dw_hdmi.o

100
drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c Normal file
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@ -0,0 +1,100 @@
/*
* R-Car Gen3 HDMI PHY
*
* Copyright (C) 2016 Renesas Electronics Corporation
*
* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <drm/bridge/dw_hdmi.h>
#define RCAR_HDMI_PHY_OPMODE_PLLCFG 0x06 /* Mode of operation and PLL dividers */
#define RCAR_HDMI_PHY_PLLCURRGMPCTRL 0x10 /* PLL current and Gmp (conductance) */
#define RCAR_HDMI_PHY_PLLDIVCTRL 0x11 /* PLL dividers */
struct rcar_hdmi_phy_params {
unsigned long mpixelclock;
u16 opmode_div; /* Mode of operation and PLL dividers */
u16 curr_gmp; /* PLL current and Gmp (conductance) */
u16 div; /* PLL dividers */
};
static const struct rcar_hdmi_phy_params rcar_hdmi_phy_params[] = {
{ 35500000, 0x0003, 0x0344, 0x0328 },
{ 44900000, 0x0003, 0x0285, 0x0128 },
{ 71000000, 0x0002, 0x1184, 0x0314 },
{ 90000000, 0x0002, 0x1144, 0x0114 },
{ 140250000, 0x0001, 0x20c4, 0x030a },
{ 182750000, 0x0001, 0x2084, 0x010a },
{ 281250000, 0x0000, 0x0084, 0x0305 },
{ 297000000, 0x0000, 0x0084, 0x0105 },
{ ~0UL, 0x0000, 0x0000, 0x0000 },
};
static int rcar_hdmi_phy_configure(struct dw_hdmi *hdmi,
const struct dw_hdmi_plat_data *pdata,
unsigned long mpixelclock)
{
const struct rcar_hdmi_phy_params *params = rcar_hdmi_phy_params;
for (; params && params->mpixelclock != ~0UL; ++params) {
if (mpixelclock <= params->mpixelclock)
break;
}
if (params->mpixelclock == ~0UL)
return -EINVAL;
dw_hdmi_phy_i2c_write(hdmi, params->opmode_div,
RCAR_HDMI_PHY_OPMODE_PLLCFG);
dw_hdmi_phy_i2c_write(hdmi, params->curr_gmp,
RCAR_HDMI_PHY_PLLCURRGMPCTRL);
dw_hdmi_phy_i2c_write(hdmi, params->div, RCAR_HDMI_PHY_PLLDIVCTRL);
return 0;
}
static const struct dw_hdmi_plat_data rcar_dw_hdmi_plat_data = {
.configure_phy = rcar_hdmi_phy_configure,
};
static int rcar_dw_hdmi_probe(struct platform_device *pdev)
{
return dw_hdmi_probe(pdev, &rcar_dw_hdmi_plat_data);
}
static int rcar_dw_hdmi_remove(struct platform_device *pdev)
{
dw_hdmi_remove(pdev);
return 0;
}
static const struct of_device_id rcar_dw_hdmi_of_table[] = {
{ .compatible = "renesas,rcar-gen3-hdmi" },
{ /* Sentinel */ },
};
MODULE_DEVICE_TABLE(of, rcar_dw_hdmi_of_table);
static struct platform_driver rcar_dw_hdmi_platform_driver = {
.probe = rcar_dw_hdmi_probe,
.remove = rcar_dw_hdmi_remove,
.driver = {
.name = "rcar-dw-hdmi",
.of_match_table = rcar_dw_hdmi_of_table,
},
};
module_platform_driver(rcar_dw_hdmi_platform_driver);
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_DESCRIPTION("Renesas R-Car Gen3 HDMI Encoder Driver");
MODULE_LICENSE("GPL");