drm/amd/display: Added support for individual control for multiple back-light instances.

[Why & How]
Added support for individual control for multiple back-light instances.
Signed-off-by: Jake Wang <haonan.wang2@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -1709,7 +1709,6 @@ static int dm_late_init(void *handle)
 	unsigned int linear_lut[16];
 	int i;
 	struct dmcu *dmcu = NULL;
-	bool ret = true;
 
 	dmcu = adev->dm.dc->res_pool->dmcu;
 
@@ -1726,18 +1725,23 @@ static int dm_late_init(void *handle)
 	 * 0xFFFF x 0.01 = 0x28F
 	 */
 	params.min_abm_backlight = 0x28F;
-
 	/* In the case where abm is implemented on dmcub,
-	 * dmcu object will be null.
-	 * ABM 2.4 and up are implemented on dmcub.
-	 */
-	if (dmcu)
-		ret = dmcu_load_iram(dmcu, params);
-	else if (adev->dm.dc->ctx->dmub_srv)
-		ret = dmub_init_abm_config(adev->dm.dc->res_pool, params);
+	* dmcu object will be null.
+	* ABM 2.4 and up are implemented on dmcub.
+	*/
+	if (dmcu) {
+		if (!dmcu_load_iram(dmcu, params))
+			return -EINVAL;
+	} else if (adev->dm.dc->ctx->dmub_srv) {
+		struct dc_link *edp_links[MAX_NUM_EDP];
+		int edp_num;
 
-	if (!ret)
-		return -EINVAL;
+		get_edp_links(adev->dm.dc, edp_links, &edp_num);
+		for (i = 0; i < edp_num; i++) {
+			if (!dmub_init_abm_config(adev->dm.dc->res_pool, params, i))
+				return -EINVAL;
+		}
+	}
 
 	return detect_mst_link_for_all_connectors(adev_to_drm(adev));
 }

drivers/gpu/drm/amd/display/dc/dc_link.h

@@ -216,6 +216,23 @@ static inline void get_edp_links(const struct dc *dc,
 	}
 }
 
+static inline bool dc_get_edp_link_panel_inst(const struct dc *dc,
+		const struct dc_link *link,
+		unsigned int *inst_out)
+{
+	struct dc_link *edp_links[MAX_NUM_EDP];
+	int edp_num;
+
+	if (link->connector_signal != SIGNAL_TYPE_EDP)
+		return false;
+	get_edp_links(dc, edp_links, &edp_num);
+	if ((edp_num > 1) && (link->link_index > edp_links[0]->link_index))
+		*inst_out = 1;
+	else
+		*inst_out = 0;
+	return true;
+}
+
 /* Set backlight level of an embedded panel (eDP, LVDS).
  * backlight_pwm_u16_16 is unsigned 32 bit with 16 bit integer
  * and 16 bit fractional, where 1.0 is max backlight value.

drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c

@@ -172,16 +172,12 @@ static bool dmub_abm_set_level(struct abm *abm, uint32_t level)
 
 static bool dmub_abm_init_config(struct abm *abm,
 	const char *src,
-	unsigned int bytes)
+	unsigned int bytes,
+	unsigned int inst)
 {
 	union dmub_rb_cmd cmd;
 	struct dc_context *dc = abm->ctx;
-	uint32_t edp_id_count = dc->dc_edp_id_count;
-	int i;
-	uint8_t panel_mask = 0;
-
-	for (i = 0; i < edp_id_count; i++)
-		panel_mask |= 0x01 << i;
+	uint8_t panel_mask = 0x01 << inst;
 
 	// TODO: Optimize by only reading back final 4 bytes
 	dmub_flush_buffer_mem(&dc->dmub_srv->dmub->scratch_mem_fb);

drivers/gpu/drm/amd/display/dc/inc/hw/abm.h

@@ -52,7 +52,8 @@ struct abm_funcs {
 	unsigned int (*get_target_backlight)(struct abm *abm);
 	bool (*init_abm_config)(struct abm *abm,
 			const char *src,
-			unsigned int bytes);
+			unsigned int bytes,
+			unsigned int inst);
 };
 
 #endif

drivers/gpu/drm/amd/display/modules/power/power_helpers.c

@@ -660,7 +660,8 @@ static void fill_iram_v_2_3(struct iram_table_v_2_2 *ram_table, struct dmcu_iram
 }
 
 bool dmub_init_abm_config(struct resource_pool *res_pool,
-	struct dmcu_iram_parameters params)
+	struct dmcu_iram_parameters params,
+	unsigned int inst)
 {
 	struct iram_table_v_2_2 ram_table;
 	struct abm_config_table config;
@@ -669,7 +670,7 @@ bool dmub_init_abm_config(struct resource_pool *res_pool,
 	uint32_t i, j = 0;
 
 #if defined(CONFIG_DRM_AMD_DC_DCN)
-	if (res_pool->abm == NULL && res_pool->multiple_abms[0] == NULL)
+	if (res_pool->abm == NULL && res_pool->multiple_abms[inst] == NULL)
 		return false;
 #else
 	if (res_pool->abm == NULL)
@@ -728,13 +729,13 @@ bool dmub_init_abm_config(struct resource_pool *res_pool,
 	config.min_abm_backlight = ram_table.min_abm_backlight;
 
 #if defined(CONFIG_DRM_AMD_DC_DCN)
-	if (res_pool->multiple_abms[0])
-		result = res_pool->multiple_abms[0]->funcs->init_abm_config(
-			res_pool->multiple_abms[0], (char *)(&config), sizeof(struct abm_config_table));
-	else
+	if (res_pool->multiple_abms[inst]) {
+		result = res_pool->multiple_abms[inst]->funcs->init_abm_config(
+			res_pool->multiple_abms[inst], (char *)(&config), sizeof(struct abm_config_table), inst);
+	} else
 #endif
 		result = res_pool->abm->funcs->init_abm_config(
-			res_pool->abm, (char *)(&config), sizeof(struct abm_config_table));
+			res_pool->abm, (char *)(&config), sizeof(struct abm_config_table), 0);
 
 	return result;
 }

drivers/gpu/drm/amd/display/modules/power/power_helpers.h

@@ -49,6 +49,7 @@ struct dmcu_iram_parameters {
 bool dmcu_load_iram(struct dmcu *dmcu,
 		struct dmcu_iram_parameters params);
 bool dmub_init_abm_config(struct resource_pool *res_pool,
-		struct dmcu_iram_parameters params);
+		struct dmcu_iram_parameters params,
+		unsigned int inst);
 
 #endif /* MODULES_POWER_POWER_HELPERS_H_ */