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SubjectRe: [PATCH] drm/panel: Add prepare_prev_first flag to Visionox VTDR6130
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On 7/31/2023 6:00 AM, Neil Armstrong wrote:
> Hi,
>
> On 26/07/2023 00:56, Jessica Zhang wrote:
>> Due to a recent introduction of the pre_enable_prev_first bridge flag
>> [1],
>> the panel driver will be probed before the DSI is enabled, causing the
>> DCS commands to fail to send.
>>
>> Ensure that DSI is enabled before panel probe by setting the
>> prepare_prev_first flag for the panel.
>
> Well this is specific to MSM DSI driver, it's not related at all to the
> panel.

Hi Neil,

I think there might be some confusion caused by the commit message --
instead of "enabled before panel probe", it should be "enabled before
panel pre_enable()" as the panel on commands are sent during prepare(),
which is matched to bridge pre_enable().

IIRC the general rule is that the panel driver should set the
prepare_prev_first flag if the on commands are sent during pre_enable(),
so I'll keep the code change but correct the commit message if that's ok
with you.

Thanks,

Jessica Zhang

>
> Neil
>
>>
>> [1] commit 4fb912e5e190 ("drm/bridge: Introduce pre_enable_prev_first
>> to alter bridge init order")
>>
>> Fixes: 2349183d32d8 ("drm/panel: add visionox vtdr6130 DSI panel driver")
>> Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
>> ---
>>   drivers/gpu/drm/panel/panel-visionox-vtdr6130.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
>> b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
>> index bb0dfd86ea67..e1363e128e7e 100644
>> --- a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
>> +++ b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
>> @@ -296,6 +296,7 @@ static int visionox_vtdr6130_probe(struct
>> mipi_dsi_device *dsi)
>>       dsi->format = MIPI_DSI_FMT_RGB888;
>>       dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
>> MIPI_DSI_MODE_NO_EOT_PACKET |
>>                 MIPI_DSI_CLOCK_NON_CONTINUOUS;
>> +    ctx->panel.prepare_prev_first = true;
>>       drm_panel_init(&ctx->panel, dev, &visionox_vtdr6130_panel_funcs,
>>                  DRM_MODE_CONNECTOR_DSI);
>>
>> ---
>> base-commit: 28a5c036b05fc5c935cc72d76abd3589825ea9cd
>> change-id: 20230717-visionox-vtdr-prev-first-e00ae02eec9f
>>
>> Best regards,
>

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