[PATCH V3] drm/bridge: adv7511: Fix Intermittent EDID failures

[Dmitry Baryshkov]

On Sun, Jun 30, 2024 at 05:19:31PM GMT, Adam Ford wrote:
> In the process of adding support for shared IRQ pins, a scenario
> was accidentally created where adv7511_irq_process returned
> prematurely causing the EDID to fail randomly.
> 
> Since the interrupt handler is broken up into two main helper functions,
> update both of them to treat the helper functions as IRQ handlers. These
> IRQ routines process their respective tasks as before, but if they
> determine that actual work was done, mark the respective IRQ status
> accordingly, and delay the check until everything has been processed.
> 
> This should guarantee the helper functions don't return prematurely
> while still returning proper values of either IRQ_HANDLED or IRQ_NONE.
> 
> Reported-by: Liu Ying <victor.liu at nxp.com>
> Fixes: f3d9683346d6 ("drm/bridge: adv7511: Allow IRQ to share GPIO pins")
> Signed-off-by: Adam Ford <aford173 at gmail.com>
> Tested-by: Liu Ying <victor.liu at nxp.com> # i.MX8MP EVK ADV7535 EDID retrieval w/o IRQ
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> ---
> V3:  Remove unnecessary declaration of ret by evaluating the return
>      code of regmap_read directly.
> 
> V2:  Fix uninitialized cec_status
>      Cut back a little on error handling to return either IRQ_NONE or
>      IRQ_HANDLED.
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>


-- 
With best wishes
Dmitry