linux-kernel - [PATCH v2 1/2] drm/msm/dp: Disable wide bus support for SDM845

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Message-Id: <20250212-sdm845_dp-v2-1-4954e51458f4@gmail.com>
Date: Wed, 12 Feb 2025 15:03:46 -0800
From: "James A. MacInnes" <james.a.macinnes@...il.com>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Chandan Uddaraju <chandanu@...eaurora.org>, 
 Stephen Boyd <swboyd@...omium.org>, Vara Reddy <quic_varar@...cinc.com>, 
 Tanmay Shah <tanmay@...eaurora.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Guenter Roeck <groeck@...omium.org>, Rob Clark <robdclark@...omium.org>, 
 "James A. MacInnes" <james.a.macinnes@...il.com>
Subject: [PATCH v2 1/2] drm/msm/dp: Disable wide bus support for SDM845

SDM845 DPU hardware is rev 4.0.0 per hardware documents.
Original patch to enable wide_bus operation did not take into account
the SDM845 and it got carried over by accident.

- Incorrect setting caused inoperable DisplayPort.
- Corrected by separating SDM845 into its 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..e30cccd63910 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 },
+	{}
+};
+
 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