linux-kernel - [PATCH 1/2] drm/msm/dp: Disable wide bus support for SDM845

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Message-ID: <20250212034225.2565069-2-james.a.macinnes@gmail.com>
Date: Tue, 11 Feb 2025 19:42:24 -0800
From: "James A. MacInnes" <james.a.macinnes@...il.com>
To: linux-arm-msm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	robdclark@...il.com,
	quic_abhinavk@...cinc.com,
	dmitry.baryshkov@...aro.org,
	sean@...rly.run,
	marijn.suijten@...ainline.org,
	airlied@...il.com,
	simona@...ll.ch,
	"James A. MacInnes" <james.a.macinnes@...il.com>
Subject: [PATCH 1/2] drm/msm/dp: Disable wide bus support for SDM845

SDM845 DPU hardware is rev 4.0.0 per hardware document.

Incorrect setting caused inop displayport.
Corrected by separating SDM845 to own descriptor.

Fixes: c7c412202623 ("drm/msm/dp: enable widebus on all relevant chipsets")

Signed-off-by: James A. MacInnes <james.a.macinnes@...il.com>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index aff51bb973eb..2cbdbf85a85c 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -126,6 +126,11 @@ static const struct msm_dp_desc msm_dp_desc_sa8775p[] = {
 	{}
 };
 
+static const struct msm_dp_desc msm_dp_desc_sdm845[] = {
+	{ .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = false },
+	{}
+};
+
 static const struct msm_dp_desc msm_dp_desc_sc7180[] = {
 	{ .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
 	{}
@@ -178,7 +183,7 @@ static const struct of_device_id msm_dp_dt_match[] = {
 	{ .compatible = "qcom,sc8180x-edp", .data = &msm_dp_desc_sc8180x },
 	{ .compatible = "qcom,sc8280xp-dp", .data = &msm_dp_desc_sc8280xp },
 	{ .compatible = "qcom,sc8280xp-edp", .data = &msm_dp_desc_sc8280xp },
-	{ .compatible = "qcom,sdm845-dp", .data = &msm_dp_desc_sc7180 },
+	{ .compatible = "qcom,sdm845-dp", .data = &msm_dp_desc_sdm845 },
 	{ .compatible = "qcom,sm8350-dp", .data = &msm_dp_desc_sc7180 },
 	{ .compatible = "qcom,sm8650-dp", .data = &msm_dp_desc_sm8650 },
 	{ .compatible = "qcom,x1e80100-dp", .data = &msm_dp_desc_x1e80100 },
-- 
2.43.0