linux-kernel - [PATCH 5.15 251/667] drm/msm/dpu: adjust display_v

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Message-Id: <20220607164942.312261844@linuxfoundation.org>
Date:   Tue,  7 Jun 2022 18:58:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 251/667] drm/msm/dpu: adjust display_v_end for eDP and DP

From: Kuogee Hsieh <quic_khsieh@...cinc.com>

[ Upstream commit e18aeea7f5efb9508722c8c7fd4d32e6f8cdfe50 ]

The “DP timing” requires the active region to be defined in the
bottom-right corner of the frame dimensions which is different
with DSI. Therefore both display_h_end and display_v_end need
to be adjusted accordingly. However current implementation has
only display_h_end adjusted.

Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>

Fixes: fc3a69ec68d3 ("drm/msm/dpu: intf timing path for displayport")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
Patchwork: https://patchwork.freedesktop.org/patch/476277/
Link: https://lore.kernel.org/r/1645824192-29670-2-git-send-email-quic_khsieh@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c | 1 +
 1 file changed, 1 insertion(+)

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 116e2b5b1a90..284f5610dc35 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
@@ -148,6 +148,7 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
 		active_v_end = active_v_start + (p->yres * hsync_period) - 1;
 
 		display_v_start += p->hsync_pulse_width + p->h_back_porch;
+		display_v_end   -= p->h_front_porch; 
 
 		active_hctl = (active_h_end << 16) | active_h_start;
 		display_hctl = active_hctl;
-- 
2.35.1