drm/amd/display: implement shared PSR-SU sink validation helper

[why]
creating a generic helper for AMD specific PSR-SU sink validation.
Moving the function to the power module to reference it across all
OS.

[how]
- drop PSRSU specific sink validation helper and move to power
  module by reading PSR version and other PSR caps
- call the new helper from linux DM (amdgpu_dm_psr)

Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: David Zhang <dingchen.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
index 2b00f334e93d..97928d4c3b9a 100644
--- a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
+++ b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
@@ -784,3 +784,41 @@ bool dmcu_load_iram(struct dmcu *dmcu,
 	return result;
 }
 
+/*
+ * is_psr_su_specific_panel() - check if sink is AMD vendor-specific PSR-SU
+ * supported eDP device.
+ *
+ * @link: dc link pointer
+ *
+ * Return: true if AMDGPU vendor specific PSR-SU eDP panel
+ */
+bool is_psr_su_specific_panel(struct dc_link *link)
+{
+	if (link->dpcd_caps.edp_rev >= DP_EDP_14) {
+		if (link->dpcd_caps.psr_info.psr_version >= DP_PSR2_WITH_Y_COORD_ET_SUPPORTED)
+			return true;
+		/*
+		 * Some panels will report PSR capabilities over additional DPCD bits.
+		 * Such panels are approved despite reporting only PSR v3, as long as
+		 * the additional bits are reported.
+		 */
+		if (link->dpcd_caps.psr_info.psr_version < DP_PSR2_WITH_Y_COORD_IS_SUPPORTED)
+			return false;
+
+		if (link->dpcd_caps.sink_dev_id == DP_BRANCH_DEVICE_ID_001CF8) {
+			/*
+			 * FIXME:
+			 * This is the temporary workaround to disable PSRSU when system turned on
+			 * DSC function on the sepcific sink. Once the PSRSU + DSC is fixed, this
+			 * condition should be removed.
+			 */
+			if (link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT)
+				return false;
+
+			if (link->dpcd_caps.psr_info.force_psrsu_cap == 0x1)
+				return true;
+		}
+	}
+
+	return false;
+}