forked from Minki/linux
2630addf6b
Some panel will default to zero brightness when turning the panel off and on again. This patch restores last brightness level back when panel is turning back on. Signed-off-by: Puthikorn Voravootivat <puthik@chromium.org> Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170511230225.142870-8-puthik@chromium.org
196 lines
6.2 KiB
C
196 lines
6.2 KiB
C
/*
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* Copyright © 2015 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include "intel_drv.h"
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static void set_aux_backlight_enable(struct intel_dp *intel_dp, bool enable)
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{
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uint8_t reg_val = 0;
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if (drm_dp_dpcd_readb(&intel_dp->aux, DP_EDP_DISPLAY_CONTROL_REGISTER,
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®_val) < 0) {
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DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n",
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DP_EDP_DISPLAY_CONTROL_REGISTER);
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return;
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}
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if (enable)
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reg_val |= DP_EDP_BACKLIGHT_ENABLE;
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else
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reg_val &= ~(DP_EDP_BACKLIGHT_ENABLE);
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if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_EDP_DISPLAY_CONTROL_REGISTER,
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reg_val) != 1) {
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DRM_DEBUG_KMS("Failed to %s aux backlight\n",
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enable ? "enable" : "disable");
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}
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}
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/*
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* Read the current backlight value from DPCD register(s) based
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* on if 8-bit(MSB) or 16-bit(MSB and LSB) values are supported
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*/
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static uint32_t intel_dp_aux_get_backlight(struct intel_connector *connector)
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{
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struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
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uint8_t read_val[2] = { 0x0 };
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uint16_t level = 0;
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if (drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB,
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&read_val, sizeof(read_val)) < 0) {
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DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n",
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DP_EDP_BACKLIGHT_BRIGHTNESS_MSB);
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return 0;
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}
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level = read_val[0];
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if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT)
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level = (read_val[0] << 8 | read_val[1]);
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return level;
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}
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/*
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* Sends the current backlight level over the aux channel, checking if its using
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* 8-bit or 16 bit value (MSB and LSB)
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*/
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static void
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intel_dp_aux_set_backlight(struct intel_connector *connector, u32 level)
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{
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struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
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uint8_t vals[2] = { 0x0 };
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vals[0] = level;
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/* Write the MSB and/or LSB */
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if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT) {
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vals[0] = (level & 0xFF00) >> 8;
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vals[1] = (level & 0xFF);
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}
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if (drm_dp_dpcd_write(&intel_dp->aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB,
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vals, sizeof(vals)) < 0) {
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DRM_DEBUG_KMS("Failed to write aux backlight level\n");
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return;
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}
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}
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static void intel_dp_aux_enable_backlight(struct intel_connector *connector)
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{
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struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
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uint8_t dpcd_buf = 0;
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uint8_t edp_backlight_mode = 0;
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if (drm_dp_dpcd_readb(&intel_dp->aux,
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DP_EDP_BACKLIGHT_MODE_SET_REGISTER, &dpcd_buf) != 1) {
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DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n",
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DP_EDP_BACKLIGHT_MODE_SET_REGISTER);
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return;
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}
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edp_backlight_mode = dpcd_buf & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK;
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switch (edp_backlight_mode) {
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case DP_EDP_BACKLIGHT_CONTROL_MODE_PWM:
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case DP_EDP_BACKLIGHT_CONTROL_MODE_PRESET:
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case DP_EDP_BACKLIGHT_CONTROL_MODE_PRODUCT:
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dpcd_buf &= ~DP_EDP_BACKLIGHT_CONTROL_MODE_MASK;
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dpcd_buf |= DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD;
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if (drm_dp_dpcd_writeb(&intel_dp->aux,
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DP_EDP_BACKLIGHT_MODE_SET_REGISTER, dpcd_buf) < 0) {
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DRM_DEBUG_KMS("Failed to write aux backlight mode\n");
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}
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break;
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/* Do nothing when it is already DPCD mode */
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case DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD:
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default:
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break;
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}
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set_aux_backlight_enable(intel_dp, true);
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intel_dp_aux_set_backlight(connector, connector->panel.backlight.level);
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}
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static void intel_dp_aux_disable_backlight(struct intel_connector *connector)
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{
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set_aux_backlight_enable(enc_to_intel_dp(&connector->encoder->base), false);
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}
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static int intel_dp_aux_setup_backlight(struct intel_connector *connector,
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enum pipe pipe)
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{
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struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
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struct intel_panel *panel = &connector->panel;
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intel_dp_aux_enable_backlight(connector);
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if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT)
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panel->backlight.max = 0xFFFF;
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else
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panel->backlight.max = 0xFF;
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panel->backlight.min = 0;
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panel->backlight.level = intel_dp_aux_get_backlight(connector);
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panel->backlight.enabled = panel->backlight.level != 0;
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return 0;
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}
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static bool
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intel_dp_aux_display_control_capable(struct intel_connector *connector)
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{
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struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
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/* Check the eDP Display control capabilities registers to determine if
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* the panel can support backlight control over the aux channel
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*/
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if (intel_dp->edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP &&
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(intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) &&
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(intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP) &&
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!((intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_PIN_ENABLE_CAP) ||
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(intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP))) {
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DRM_DEBUG_KMS("AUX Backlight Control Supported!\n");
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return true;
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}
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return false;
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}
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int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector)
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{
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struct intel_panel *panel = &intel_connector->panel;
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if (!i915.enable_dpcd_backlight)
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return -ENODEV;
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if (!intel_dp_aux_display_control_capable(intel_connector))
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return -ENODEV;
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panel->backlight.setup = intel_dp_aux_setup_backlight;
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panel->backlight.enable = intel_dp_aux_enable_backlight;
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panel->backlight.disable = intel_dp_aux_disable_backlight;
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panel->backlight.set = intel_dp_aux_set_backlight;
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panel->backlight.get = intel_dp_aux_get_backlight;
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return 0;
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}
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