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SubjectRe: [PATCH] drm/panel: atna33xc20: Fix unbalanced regulator in the case HPD doesn't assert
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On 3/13/2024 2:12 PM, Douglas Anderson via B4 Relay wrote:
> From: Douglas Anderson <dianders@chromium.org>
>
> When the atna33xc20 driver was first written the resume code never
> returned an error. If there was a problem waiting for HPD it just
> printed a warning and moved on. This changed in response to review
> feedback [1] on a future patch but I accidentally didn't account for
> rolling back the regulator enable in the error cases. Do so now.
>
> [1] https://lore.kernel.org/all/5f3cf3a6-1cc2-63e4-f76b-4ee686764705@linaro.org/
>
> Fixes: 3b5765df375c ("drm/panel: atna33xc20: Take advantage of wait_hpd_asserted() in struct drm_dp_aux")
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
> drivers/gpu/drm/panel/panel-samsung-atna33xc20.c | 22 +++++++++++++---------
> 1 file changed, 13 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-samsung-atna33xc20.c b/drivers/gpu/drm/panel/panel-samsung-atna33xc20.c
> index 76c2a8f6718c..9c336c71562b 100644
> --- a/drivers/gpu/drm/panel/panel-samsung-atna33xc20.c
> +++ b/drivers/gpu/drm/panel/panel-samsung-atna33xc20.c
> @@ -109,19 +109,17 @@ static int atana33xc20_resume(struct device *dev)
> if (hpd_asserted < 0)
> ret = hpd_asserted;
>
> - if (ret)
> + if (ret) {
> dev_warn(dev, "Error waiting for HPD GPIO: %d\n", ret);
> -
> - return ret;
> - }
> -
> - if (p->aux->wait_hpd_asserted) {
> + goto error;
> + }
> + } else if (p->aux->wait_hpd_asserted) {

Hi Doug,

Acked-by: Jessica Zhang <quic_jesszhan@quicinc.com>

Thanks,

Jessica Zhang

> ret = p->aux->wait_hpd_asserted(p->aux, HPD_MAX_US);
>
> - if (ret)
> + if (ret) {
> dev_warn(dev, "Controller error waiting for HPD: %d\n", ret);
> -
> - return ret;
> + goto error;
> + }
> }
>
> /*
> @@ -133,6 +131,12 @@ static int atana33xc20_resume(struct device *dev)
> * right times.
> */
> return 0;
> +
> +error:
> + drm_dp_dpcd_set_powered(p->aux, false);
> + regulator_disable(p->supply);
> +
> + return ret;
> }
>
> static int atana33xc20_disable(struct drm_panel *panel)
>
> ---
> base-commit: b33651a5c98dbd5a919219d8c129d0674ef74299
> change-id: 20240311-homestarpanel-regulator-f4b890ff4b7c
>
> Best regards,
> --
> Douglas Anderson <dianders@chromium.org>
>

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