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linux-brain/drivers/gpu/drm/msm/disp/mdp5
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Marijn Suijten c499817594 drm/msm/mdp5: Do not multiply vclk line count by 100 
[ Upstream commit 377569f82ea8228c421cef4da33e056a900b58ca ]

Neither vtotal nor drm_mode_vrefresh contain a value that is
premultiplied by 100 making the x100 variable name incorrect and
resulting in vclks_line to become 100 times larger than it is supposed
to be.  The hardware counts 100 clockticks too many before tearcheck,
leading to severe panel issues on at least the Sony Xperia lineup.

This is likely an artifact from the original MDSS DSI panel driver where
the calculation [1] corrected for a premultiplied reference framerate by
100 [2].  It does not appear that the above values were ever
premultiplied in the history of the DRM MDP5 driver.

With this change applied the value written to the SYNC_CONFIG_VSYNC
register is now identical to downstream kernels.

[1]: https://source.codeaurora.org/quic/la/kernel/msm-3.18/tree/drivers/video/msm/mdss/mdss_mdp_intf_cmd.c?h=LA.UM.8.6.c26-02400-89xx.0#n288
[2]: https://source.codeaurora.org/quic/la/kernel/msm-3.18/tree/drivers/video/msm/mdss/mdss_dsi_panel.c?h=LA.UM.8.6.c26-02400-89xx.0#n1648

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Link: https://lore.kernel.org/r/20210406214726.131534-3-marijn.suijten@somainline.org
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2021-05-11 14:04:12 +02:00
..
mdp5.xml.h drm/msm: update generated headers 2018-08-10 18:49:18 -04:00
mdp5_cfg.c drm/msm/mdp5: Add msm8998 support 2019-09-03 16:16:58 -07:00
mdp5_cfg.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
mdp5_cmd_encoder.c drm/msm/mdp5: Do not multiply vclk line count by 100 2021-05-11 14:04:12 +02:00
mdp5_crtc.c drm/msm/mdp5: Fix wait-for-commit for cmd panels 2021-03-04 10:26:37 +01:00
mdp5_ctl.c drm/msm: remove unlikely() from WARN_ON() conditions 2019-09-04 08:42:45 -07:00
mdp5_ctl.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
mdp5_encoder.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
mdp5_irq.c drm/msm: drop use of drmP.h 2019-09-03 16:16:57 -07:00
mdp5_kms.c drm/msm/mdp5: Fix mdp5_init error path for failed mdp5_kms allocation 2020-06-24 17:50:29 +02:00
mdp5_kms.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
mdp5_mdss.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
mdp5_mixer.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
mdp5_mixer.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
mdp5_pipe.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
mdp5_pipe.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
mdp5_plane.c drm/msm: drop use of drmP.h 2019-09-03 16:16:57 -07:00
mdp5_smp.c drm/msm: drop use of drmP.h 2019-09-03 16:16:57 -07:00
mdp5_smp.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00