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From: Marijn Suijten <marijn.suijten@somainline.org>
To: phone-devel@vger.kernel.org
Cc: ~postmarketos/upstreaming@lists.sr.ht,
	AngeloGioacchino Del Regno 
	<angelogioacchino.delregno@somainline.org>,
	Konrad Dybcio <konrad.dybcio@somainline.org>,
	Martin Botka <martin.botka@somainline.org>,
	Marijn Suijten <marijn.suijten@somainline.org>,
	Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
	linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/3] drm/msm/mdp5: Configure PP_SYNC_HEIGHT to double the vtotal
Date: Tue,  6 Apr 2021 23:47:24 +0200
Message-ID: <20210406214726.131534-2-marijn.suijten@somainline.org> (raw)
In-Reply-To: <20210406214726.131534-1-marijn.suijten@somainline.org>

Leaving this at a close-to-maximum register value 0xFFF0 means it takes
very long for the MDSS to generate a software vsync interrupt when the
hardware TE interrupt doesn't arrive.  Configuring this to double the
vtotal (like some downstream kernels) leads to a frame to take at most
twice before the vsync signal, until hardware TE comes up.

In this case the hardware interrupt responsible for providing this
signal - "disp-te" gpio - is not hooked up to the mdp5 vsync/pp logic at
all.  This solves severe panel update issues observed on at least the
Xperia Loire and Tone series, until said gpio is properly hooked up to
an irq.

Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
---
 drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c
index ff2c1d583c79..2d5ac03dbc17 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c
@@ -51,7 +51,7 @@ static int pingpong_tearcheck_setup(struct drm_encoder *encoder,
 
 	mdp5_write(mdp5_kms, REG_MDP5_PP_SYNC_CONFIG_VSYNC(pp_id), cfg);
 	mdp5_write(mdp5_kms,
-		REG_MDP5_PP_SYNC_CONFIG_HEIGHT(pp_id), 0xfff0);
+		REG_MDP5_PP_SYNC_CONFIG_HEIGHT(pp_id), (2 * mode->vtotal));
 	mdp5_write(mdp5_kms,
 		REG_MDP5_PP_VSYNC_INIT_VAL(pp_id), mode->vdisplay);
 	mdp5_write(mdp5_kms, REG_MDP5_PP_RD_PTR_IRQ(pp_id), mode->vdisplay + 1);
-- 
2.31.1


  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-06 21:47 [PATCH 0/3] drm/msm/mdp5: Emit vsync signal often enough Marijn Suijten
2021-04-06 21:47 ` Marijn Suijten [this message]
2021-04-07 18:19   ` [Freedreno] [PATCH 1/3] drm/msm/mdp5: Configure PP_SYNC_HEIGHT to double the vtotal abhinavk
2021-04-07 19:11     ` AngeloGioacchino Del Regno
2021-04-08 19:05       ` Rob Clark
     [not found]         ` <CAK7fi1aUXy2i8zY0Cb5Svq0s1H9cSAvY4hq+BsiWgdphwm-ebA@mail.gmail.com>
2021-04-09  0:08           ` Rob Clark
2021-04-09  8:22             ` Marijn Suijten
2021-04-06 21:47 ` [PATCH 2/3] drm/msm/mdp5: Do not multiply vclk line count by 100 Marijn Suijten
2021-04-06 21:47 ` [PATCH 3/3] drm/msm/mdp5: Disable pingpong autorefresh at tearcheck init Marijn Suijten

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