[PATCH v5, 4/5] drm/mediatek: keep dsi as LP00 before dcs cmds transfer

[AngeloGioacchino Del Regno]

Il 11/05/22 04:36, xinlei.lee at mediatek.com ha scritto:
> From: Jitao Shi <jitao.shi at mediatek.com>
> 
> To comply with the panel sequence, hold the mipi signal to LP00 before the dcs cmds transmission,
> and pull the mipi signal high from LP00 to LP11 until the start of the dcs cmds transmission.
> The normal panel timing is :
> (1) pp1800 DC pull up
> (2) avdd & avee AC pull high
> (3) lcm_reset pull high -> pull low -> pull high
> (4) Pull MIPI signal high (LP11) -> initial code -> send video data(HS mode)
> The power-off sequence is reversed.
> If dsi is not in cmd mode, then dsi will pull the mipi signal high in the mtk_output_dsi_enable function.
> The delay in lane_ready func is the reaction time of dsi_rx after pulling up the mipi signal.
> 
> Fixes: 2dd8075d2185 ("drm/mediatek: mtk_dsi: Use the drm_panel_bridge API")
> 
> Signed-off-by: Jitao Shi <jitao.shi at mediatek.com>
> Signed-off-by: Xinlei Lee <xinlei.lee at mediatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>