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| author | Xinlei Lee <xinlei.lee@mediatek.com> | 2023-01-10 13:54:51 +0800 |
|---|---|---|
| committer | Chun-Kuang Hu <chunkuang.hu@kernel.org> | 2023-01-27 00:01:33 +0000 |
| commit | 91aeaed2c1147e3b1157dc084d23f190856a6c23 (patch) | |
| tree | 7809e2d657ebb28ccb8a0915e616e09e0aac631b /drivers/gpu/drm/mediatek/mtk_drm_gem.c | |
| parent | b5386f2911ce9afc168cc246956974b0c05b4a9d (diff) | |
drm/mediatek: dsi: Reduce the time of dsi from LP11 to sending cmd
According to Figure 16 Turnaround Procedure on page 36 in [1], you
can see the status of LP-00 -> LP10 -> LP11. This state can correspond
to the state of DSI from LP00 -> LP11 in mtk_dsi_lane_ready function
in mtk_dsi.c.
LP-00 -> LP10 -> LP11 takes about 2*TLPX time (refer to [1] page 51
to see that TLPX is 50ns)
The delay at the end of the mtk_dsi_lane_ready function should be
greater than the 2*TLPX specified by the DSI spec, and less than
the time specified by the DSI_RX (generally 6ms to 40ms), to avoid
problems caused by the RX specification
[1]:mipi_D-PHY_specification_v1-1
Fixes: 39e8d062b03c ("drm/mediatek: Keep dsi as LP00 before dcs cmds transfer")
Signed-off-by: Xinlei Lee <xinlei.lee@mediatek.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/1673330093-6771-2-git-send-email-xinlei.lee@mediatek.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Diffstat (limited to 'drivers/gpu/drm/mediatek/mtk_drm_gem.c')
0 files changed, 0 insertions, 0 deletions