Re: [PATCH v4 3/4] drm/panel: atna33xc20: Take advantage of wait_hpd_asserted() in struct drm_dp_aux

On Wed, 15 Jun 2022 at 00:54, Douglas Anderson dianders@chromium.org wrote:

Let's add support for being able to read the HPD pin even if it's hooked directly to the controller. This will let us take away the waiting in the AUX transfer functions of the eDP controller drivers.

Signed-off-by: Douglas Anderson dianders@chromium.org

Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org

---

Changes in v4:

• Reorganized logic as per Dmitry's suggestion.

Changes in v3:

• Don't check "hpd_asserted" boolean when unset.
• Handle errors from gpiod_get_value_cansleep() properly.

Changes in v2:

• Change is_hpd_asserted() to wait_hpd_asserted()

.../gpu/drm/panel/panel-samsung-atna33xc20.c | 51 ++++++++++++++----- 1 file changed, 38 insertions(+), 13 deletions(-)