Re: [PATCH] drm/dp: Clarify that wait_hpd_asserted() is not optional for panels

From: Abhinav Kumar
Date: Tue Mar 19 2024 - 14:27:51 EST




On 3/19/2024 11:14 AM, Douglas Anderson wrote:
In response to my patch removing the "wait for HPD" logic at the
beginning of the MSM DP transfer() callback [1], we had some debate
about what the "This is an optional function" meant in the
documentation of the wait_hpd_asserted() callback. Let's clarify.

As talked about in the MSM DP patch [1], before wait_hpd_asserted()
was introduced there was no great way for panel drivers to wait for
HPD in the case that the "built-in" HPD signal was used. Panel drivers
could only wait for HPD if a GPIO was used. At the time, we ended up
just saying that if we were using the "built-in" HPD signal that DP
AUX controllers needed to wait for HPD themselves at the beginning of
their transfer() callback. The fact that the wait for HPD at the
beginning of transfer() was awkward/problematic was the whole reason
wait_hpd_asserted() was added.

Let's make it obvious that if a DP AUX controller implements
wait_hpd_asserted() that they don't need a loop waiting for HPD at the
start of their transfer() function. We'll still allow DP controllers
to work the old way but mark it as deprecated.

[1] https://lore.kernel.org/r/20240315143621.v2.3.I535606f6d4f7e3e5588bb75c55996f61980183cd@changeid

Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
---
I would consider changing the docs to say that implementing
wait_hpd_asserted() is actually _required_ for any DP controllers that
want to support eDP panels parented on the DP AUX bus. The issue is
that one DP controller (tegra/dpaux.c, found by looking for those that
include display/drm_dp_aux_bus.h) does populate the DP AUX bus but
doesn't implement wait_hpd_asserted(). I'm actually not sure how/if
this work on tegra since I also don't see any delay loop for HPD in
tegra's transfer() callback. For now, I've left wait_hpd_asserted() as
optional and described the old/deprecated way things used to work
before wait_hpd_asserted().

include/drm/display/drm_dp_helper.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)


Thanks for the change,

Reviewed-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>