drm/i915: Add Backlight Control using DPCD for eDP connectors (v9) (e7156c83) · Commits · 戴 / test

drivers/gpu/drm/i915/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -81,6 +81,7 @@ i915-y += dvo_ch7017.o \
		dvo_tfp410.o \
		intel_crt.o \
		intel_ddi.o \
		intel_dp_aux_backlight.o \
		intel_dp_link_training.o \
		intel_dp_mst.o \
		intel_dp.o \

drivers/gpu/drm/i915/i915_params.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -58,6 +58,7 @@ struct i915_params i915 __read_mostly = {
		.guc_log_level = -1,
		.enable_dp_mst = true,
		.inject_load_failure = 0,
		.enable_dpcd_backlight = false,
		};

		module_param_named(modeset, i915.modeset, int, 0400);
		@@ -210,3 +211,6 @@ MODULE_PARM_DESC(enable_dp_mst,
		module_param_named_unsafe(inject_load_failure, i915.inject_load_failure, uint, 0400);
		MODULE_PARM_DESC(inject_load_failure,
		"Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)");
		module_param_named(enable_dpcd_backlight, i915.enable_dpcd_backlight, bool, 0600);
		MODULE_PARM_DESC(enable_dpcd_backlight,
		"Enable support for DPCD backlight control (default:false)");

drivers/gpu/drm/i915/i915_params.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -61,6 +61,7 @@ struct i915_params {
		bool verbose_state_checks;
		bool nuclear_pageflip;
		bool enable_dp_mst;
		bool enable_dpcd_backlight;
		};

		extern struct i915_params i915 __read_mostly;

drivers/gpu/drm/i915/intel_dp_aux_backlight.c

0 → 100644

+172 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright © 2015 Intel Corporation
		*
		* Permission is hereby granted, free of charge, to any person obtaining a
		* copy of this software and associated documentation files (the "Software"),
		* to deal in the Software without restriction, including without limitation
		* the rights to use, copy, modify, merge, publish, distribute, sublicense,
		* and/or sell copies of the Software, and to permit persons to whom the
		* Software is furnished to do so, subject to the following conditions:
		*
		* The above copyright notice and this permission notice (including the next
		* paragraph) shall be included in all copies or substantial portions of the
		* Software.
		*
		* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
		* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
		* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
		* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
		* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
		* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
		* IN THE SOFTWARE.
		*
		*/

		#include "intel_drv.h"

		static void set_aux_backlight_enable(struct intel_dp *intel_dp, bool enable)
		{
		uint8_t reg_val = 0;

		if (drm_dp_dpcd_readb(&intel_dp->aux, DP_EDP_DISPLAY_CONTROL_REGISTER,
		&reg_val) < 0) {
		DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n",
		DP_EDP_DISPLAY_CONTROL_REGISTER);
		return;
		}
		if (enable)
		reg_val \|= DP_EDP_BACKLIGHT_ENABLE;
		else
		reg_val &= ~(DP_EDP_BACKLIGHT_ENABLE);

		if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_EDP_DISPLAY_CONTROL_REGISTER,
		reg_val) != 1) {
		DRM_DEBUG_KMS("Failed to %s aux backlight\n",
		enable ? "enable" : "disable");
		}
		}

		/*
		* Read the current backlight value from DPCD register(s) based
		* on if 8-bit(MSB) or 16-bit(MSB and LSB) values are supported
		*/
		static uint32_t intel_dp_aux_get_backlight(struct intel_connector *connector)
		{
		struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
		uint8_t read_val[2] = { 0x0 };
		uint16_t level = 0;

		if (drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB,
		&read_val, sizeof(read_val)) < 0) {
		DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n",
		DP_EDP_BACKLIGHT_BRIGHTNESS_MSB);
		return 0;
		}
		level = read_val[0];
		if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT)
		level = (read_val[0] << 8 \| read_val[1]);

		return level;
		}

		/*
		* Sends the current backlight level over the aux channel, checking if its using
		* 8-bit or 16 bit value (MSB and LSB)
		*/
		static void
		intel_dp_aux_set_backlight(struct intel_connector *connector, u32 level)
		{
		struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
		uint8_t vals[2] = { 0x0 };

		vals[0] = level;

		/* Write the MSB and/or LSB */
		if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT) {
		vals[0] = (level & 0xFF00) >> 8;
		vals[1] = (level & 0xFF);
		}
		if (drm_dp_dpcd_write(&intel_dp->aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB,
		vals, sizeof(vals)) < 0) {
		DRM_DEBUG_KMS("Failed to write aux backlight level\n");
		return;
		}
		}

		static void intel_dp_aux_enable_backlight(struct intel_connector *connector)
		{
		struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
		uint8_t dpcd_buf = 0;

		set_aux_backlight_enable(intel_dp, true);

		if ((drm_dp_dpcd_readb(&intel_dp->aux,
		DP_EDP_BACKLIGHT_MODE_SET_REGISTER, &dpcd_buf) == 1) &&
		((dpcd_buf & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK) ==
		DP_EDP_BACKLIGHT_CONTROL_MODE_PRESET))
		drm_dp_dpcd_writeb(&intel_dp->aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER,
		(dpcd_buf \| DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD));
		}

		static void intel_dp_aux_disable_backlight(struct intel_connector *connector)
		{
		set_aux_backlight_enable(enc_to_intel_dp(&connector->encoder->base), false);
		}

		static int intel_dp_aux_setup_backlight(struct intel_connector *connector,
		enum pipe pipe)
		{
		struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
		struct intel_panel *panel = &connector->panel;

		intel_dp_aux_enable_backlight(connector);

		if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT)
		panel->backlight.max = 0xFFFF;
		else
		panel->backlight.max = 0xFF;

		panel->backlight.min = 0;
		panel->backlight.level = intel_dp_aux_get_backlight(connector);

		panel->backlight.enabled = panel->backlight.level != 0;

		return 0;
		}

		static bool
		intel_dp_aux_display_control_capable(struct intel_connector *connector)
		{
		struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);

		/* Check the eDP Display control capabilities registers to determine if
		* the panel can support backlight control over the aux channel
		*/
		if (intel_dp->edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP &&
		(intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) &&
		!((intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_PIN_ENABLE_CAP) \|\|
		(intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP))) {
		DRM_DEBUG_KMS("AUX Backlight Control Supported!\n");
		return true;
		}
		return false;
		}

		int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector)
		{
		struct intel_panel *panel = &intel_connector->panel;

		if (!i915.enable_dpcd_backlight)
		return -ENODEV;

		if (!intel_dp_aux_display_control_capable(intel_connector))
		return -ENODEV;

		panel->backlight.setup = intel_dp_aux_setup_backlight;
		panel->backlight.enable = intel_dp_aux_enable_backlight;
		panel->backlight.disable = intel_dp_aux_disable_backlight;
		panel->backlight.set = intel_dp_aux_set_backlight;
		panel->backlight.get = intel_dp_aux_get_backlight;

		return 0;
		}

drivers/gpu/drm/i915/intel_drv.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -1337,6 +1337,9 @@ bool intel_dp_source_supports_hbr2(struct intel_dp *intel_dp);
		bool
		intel_dp_get_link_status(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_STATUS_SIZE]);

		/* intel_dp_aux_backlight.c */
		int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector);

		/* intel_dp_mst.c */
		int intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_id);
		void intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port);

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