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SubjectRe: [PATCH] drm/msm/dp: Make it possible to enable the test pattern
Hi Bjorn

On 2021-06-28 17:22, Bjorn Andersson wrote:
> The debugfs interface contains the knobs to make the DisplayPort
> controller output a test pattern, unfortunately there's nothing
> currently that actually enables the defined test pattern.
>
> Fixes: de3ee25473ba ("drm/msm/dp: add debugfs nodes for video pattern
> tests")
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

This is not how this debugfs node works. This is meant to be used while
running
DP compliance video pattern test.

https://gitlab.freedesktop.org/drm/igt-gpu-tools/-/blob/master/tools/msm_dp_compliance.c

While the compliance test is being run with this msm_dp_compliance app
running,
it will draw the test pattern when it gets the "test_active" from the
driver.

The test pattern which this app draws is as per the requirements of the
compliance test
as the test equipment will match the CRC of the pattern which is drawn.

The API dp_panel_tpg_config() which you are trying to call here draws
the DP test pattern
from the DP controller hardware but not the pattern which the compliance
test expects.

Its just a debug API to call when required during bringup/debug
purposes.

Hence this is not the place to call it as it will end up breaking CTS.

Thanks

Abhinav

> ---
> drivers/gpu/drm/msm/dp/dp_debug.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_debug.c
> b/drivers/gpu/drm/msm/dp/dp_debug.c
> index 2f6247e80e9d..82911af44905 100644
> --- a/drivers/gpu/drm/msm/dp/dp_debug.c
> +++ b/drivers/gpu/drm/msm/dp/dp_debug.c
> @@ -305,6 +305,8 @@ static ssize_t dp_test_active_write(struct file
> *file,
> debug->panel->video_test = true;
> else
> debug->panel->video_test = false;
> +
> + dp_panel_tpg_config(debug->panel, debug->panel->video_test);
> }
> }
> drm_connector_list_iter_end(&conn_iter);

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