Hi, On 5/20/24 06:11, Dmitry Baryshkov wrote:
On Thu, May 16, 2024 at 06:10:06PM +0800, Liu Ying wrote:Commit f3d9683346d6 ("drm/bridge: adv7511: Allow IRQ to share GPIO pins") fails to consider the case where adv7511->i2c_main->irq is zero, i.e., no interrupt requested at all.Without interrupt, adv7511_wait_for_edid() could return -EIO sometimes, because it polls adv7511->edid_read flag by calling adv7511_irq_process() a few times, but adv7511_irq_process() happens to refuse to handle interrupt by returning -ENODATA. Hence, EDID retrieval fails randomly. Fix the issue by checking adv7511->i2c_main->irq before exiting interrupt handling from adv7511_irq_process(). Fixes: f3d9683346d6 ("drm/bridge: adv7511: Allow IRQ to share GPIO pins") Signed-off-by: Liu Ying <victor....@nxp.com> --- drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c index 6089b0bb9321..2074fa3c1b7b 100644 --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c @@ -479,7 +479,8 @@ static int adv7511_irq_process(struct adv7511 *adv7511, bool process_hpd) return ret;/* If there is no IRQ to handle, exit indicating no IRQ data */- if (!(irq0 & (ADV7511_INT0_HPD | ADV7511_INT0_EDID_READY)) && + if (adv7511->i2c_main->irq && + !(irq0 & (ADV7511_INT0_HPD | ADV7511_INT0_EDID_READY)) && !(irq1 & ADV7511_INT1_DDC_ERROR)) return -ENODATA;I think it might be better to handle -ENODATA in adv7511_wait_for_edid() instead. WDYT?
I think this is may deserve another patch. -- Best regards Sui
