Quoting Kuogee Hsieh (2021-01-07 12:30:24)
> irq_hpd event can only be executed at connected state. Therefore
> irq_hpd event should be postponed if it happened at connection
> pending state. This patch also make sure both link rate and lane
Why does it happen at connection pending state?
> are valid before start link training.
Can this part about link rate and lane being valid be split off into
another patch?
>
> Signed-off-by: Kuogee Hsieh <khsieh@xxxxxxxxxxxxxx>
> ---
Any fixes tag?
> drivers/gpu/drm/msm/dp/dp_display.c | 7 +++++++
> drivers/gpu/drm/msm/dp/dp_panel.c | 12 +++++++++---
> 2 files changed, 16 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 6e971d5..3bc7ed2 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -693,6 +693,13 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
> return 0;
> }
>
> + if (state == ST_CONNECT_PENDING) {
> + /* wait until ST_CONNECTED */
> + dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */
> + mutex_unlock(&dp->event_mutex);
> + return 0;
> + }
> +
> ret = dp_display_usbpd_attention_cb(&dp->pdev->dev);
> if (ret == -ECONNRESET) { /* cable unplugged */
> dp->core_initialized = false;
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