On Thu, 21 Sep 2023, Xin Ji <xji@xxxxxxxxxxxxxxxx> wrote: > For the none-interrupt design(sink device is panel, polling HPD > status when chip power on), anx7625 FW has more than 200ms HPD > de-bounce time in FW, for the safety to get HPD status, driver > better to wait 200ms before HPD detection after OS resume back. > > Signed-off-by: Xin Ji <xji@xxxxxxxxxxxxxxxx> > --- > drivers/gpu/drm/bridge/analogix/anx7625.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c > index 51abe42c639e..833d6d50a03d 100644 > --- a/drivers/gpu/drm/bridge/analogix/anx7625.c > +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c > @@ -1464,6 +1464,9 @@ static int _anx7625_hpd_polling(struct anx7625_data *ctx, > if (ctx->pdata.intp_irq) > return 0; > > + /* Delay 200ms for FW HPD de-bounce */ > + usleep_range(200000, 201000); If you need to sleep for 200 ms, maybe use msleep instead? BR, Jani. > + > ret = readx_poll_timeout(anx7625_read_hpd_status_p0, > ctx, val, > ((val & HPD_STATUS) || (val < 0)), -- Jani Nikula, Intel
