From: Zhongwei Zhang <Zhongwei.Zhang@amd.com>
Date: Tue, 13 May 2025 08:45:59 +0000 (+0800)
Subject: drm/amd/display: Correct non-OLED pre_T11_delay.
X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=893f07452bca56ff146a6be02b3294a9ea23d18a;p=linux-2.6-microblaze.git

drm/amd/display: Correct non-OLED pre_T11_delay.

[Why]
Only OLED panels require non-zero pre_T11_delay defaultly.
Others should be controlled by power sequence.

[How]
For non OLED, pre_T11_delay delay in code should be zero.
Also post_T7_delay.

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Signed-off-by: Zhongwei Zhang <Zhongwei.Zhang@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
index 23bec5d25ed6..b88b2d6b4e81 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
@@ -952,8 +952,8 @@ void dce110_edp_backlight_control(
 	struct dc_context *ctx = link->ctx;
 	struct bp_transmitter_control cntl = { 0 };
 	uint8_t pwrseq_instance = 0;
-	unsigned int pre_T11_delay = OLED_PRE_T11_DELAY;
-	unsigned int post_T7_delay = OLED_POST_T7_DELAY;
+	unsigned int pre_T11_delay = (link->dpcd_sink_ext_caps.bits.oled ? OLED_PRE_T11_DELAY : 0);
+	unsigned int post_T7_delay = (link->dpcd_sink_ext_caps.bits.oled ? OLED_POST_T7_DELAY : 0);
 
 	if (dal_graphics_object_id_get_connector_id(link->link_enc->connector)
 		!= CONNECTOR_ID_EDP) {
@@ -1069,7 +1069,8 @@ void dce110_edp_backlight_control(
 	if (!enable) {
 		/*follow oem panel config's requirement*/
 		pre_T11_delay += link->panel_config.pps.extra_pre_t11_ms;
-		msleep(pre_T11_delay);
+		if (pre_T11_delay)
+			msleep(pre_T11_delay);
 	}
 }