2022-06-06 04:57:25

by Yannick Fertre

Subject: [PATCH] drm/stm: ltdc: disable all layers before crtc shutdown

All plans must be disabled before the CRTC shutdown helping
the crtc to restart from a clean situation (without unwanted
planes already enable).

Signed-off-by: Yannick Fertre <[email protected]>
---
drivers/gpu/drm/stm/ltdc.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 6bd45df8f5a7..eeefc3260c07 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -787,11 +787,17 @@ static void ltdc_crtc_atomic_disable(struct drm_crtc *crtc,
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
struct drm_device *ddev = crtc->dev;
+ int layer_index = 0;

DRM_DEBUG_DRIVER("\n");

drm_crtc_vblank_off(crtc);

+ /* Disable all layers */
+ for (layer_index = 0; layer_index < ldev->caps.nb_layers; layer_index++)
+ regmap_write_bits(ldev->regmap, LTDC_L1CR + layer_index * LAY_OFS,
+ LXCR_CLUTEN | LXCR_LEN, 0);
+
/* disable IRQ */
regmap_clear_bits(ldev->regmap, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);

--
2.25.1

2022-06-27 14:51:30

by Philippe CORNU

Subject: Re: [PATCH] drm/stm: ltdc: disable all layers before crtc shutdown

On 6/3/22 15:41, Yannick Fertre wrote:
> All plans must be disabled before the CRTC shutdown helping
> the crtc to restart from a clean situation (without unwanted
> planes already enable).
>
> Signed-off-by: Yannick Fertre <[email protected]>
> ---
> drivers/gpu/drm/stm/ltdc.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> index 6bd45df8f5a7..eeefc3260c07 100644
> --- a/drivers/gpu/drm/stm/ltdc.c
> +++ b/drivers/gpu/drm/stm/ltdc.c
> @@ -787,11 +787,17 @@ static void ltdc_crtc_atomic_disable(struct drm_crtc *crtc,
> {
> struct ltdc_device *ldev = crtc_to_ltdc(crtc);
> struct drm_device *ddev = crtc->dev;
> + int layer_index = 0;
>
> DRM_DEBUG_DRIVER("\n");
>
> drm_crtc_vblank_off(crtc);
>
> + /* Disable all layers */
> + for (layer_index = 0; layer_index < ldev->caps.nb_layers; layer_index++)
> + regmap_write_bits(ldev->regmap, LTDC_L1CR + layer_index * LAY_OFS,
> + LXCR_CLUTEN | LXCR_LEN, 0);
> +
> /* disable IRQ */
> regmap_clear_bits(ldev->regmap, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);
>

Dear Yannick,
Many thanks for your patch,
Applied on drm-misc-next.
Have a good day
Philippe :-)