linux-kernel - [PATCH v6 2/6] drm/msm/dpu: adjust data width for widen bus case

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Message-Id: <20240530-msm-drm-dsc-dsi-video-upstream-4-v6-2-2ab1d334c657@linaro.org>
Date: Thu, 30 May 2024 13:56:46 +0800
From: Jun Nie <jun.nie@...aro.org>
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>, Daniel Vetter <daniel@...ll.ch>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, Vinod Koul <vkoul@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Jun Nie <jun.nie@...aro.org>, Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v6 2/6] drm/msm/dpu: adjust data width for widen bus case

data is valid for only half the active window if widebus
is enabled

Signed-off-by: Jun Nie <jun.nie@...aro.org>
Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on SM8550-QRD
Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on SM8650-QRD
Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on SM8650-HDK
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Reviewed-by: Jessica Zhang <quic_jesszhan@...cinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
index 225c1c7768ff..f97221423249 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
@@ -168,6 +168,15 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *intf,
 
 	data_width = p->width;
 
+	/*
+	 * If widebus is enabled, data is valid for only half the active window
+	 * since the data rate is doubled in this mode. But for the compression
+	 * mode in DP case, the p->width is already adjusted in
+	 * drm_mode_to_intf_timing_params()
+	 */
+	if (p->wide_bus_en && !dp_intf)
+		data_width = p->width >> 1;
+
 	hsync_data_start_x = hsync_start_x;
 	hsync_data_end_x =  hsync_start_x + data_width - 1;
 

-- 
2.34.1