linux-kernel - Re: [PATCH] drm/stm: ltdc: move pinctrl to encoder mode set

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Date:   Mon, 2 Dec 2019 17:18:45 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Yannick FERTRE <yannick.fertre@...com>,
        Benjamin GAIGNARD <benjamin.gaignard@...com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "Alexandre TORGUE" <alexandre.torgue@...com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/stm: ltdc: move pinctrl to encoder mode set

Dear Yannick,
Thank you for your patch,

Acked-by: Philippe Cornu <philippe.cornu@...com>

Philippe :-)

On 11/27/19 11:23 AM, Yannick Fertre wrote:
> From: Yannick Fertré <yannick.fertre@...com>
> 
> The pin control must be set to default as soon as possible to
> establish a good video link between tv & bridge hdmi
> (encoder mode set is call before encoder enable).
> 
> Signed-off-by: Yannick Fertre <yannick.fertre@...com>
> ---
>   drivers/gpu/drm/stm/ltdc.c | 24 ++++++++++++++++++------
>   1 file changed, 18 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> index 49ef406..dba8e7f 100644
> --- a/drivers/gpu/drm/stm/ltdc.c
> +++ b/drivers/gpu/drm/stm/ltdc.c
> @@ -435,9 +435,6 @@ static void ltdc_crtc_atomic_enable(struct drm_crtc *crtc,
>   	/* Commit shadow registers = update planes at next vblank */
>   	reg_set(ldev->regs, LTDC_SRCR, SRCR_VBR);
>   
> -	/* Enable LTDC */
> -	reg_set(ldev->regs, LTDC_GCR, GCR_LTDCEN);
> -
>   	drm_crtc_vblank_on(crtc);
>   }
>   
> @@ -451,9 +448,6 @@ static void ltdc_crtc_atomic_disable(struct drm_crtc *crtc,
>   
>   	drm_crtc_vblank_off(crtc);
>   
> -	/* disable LTDC */
> -	reg_clear(ldev->regs, LTDC_GCR, GCR_LTDCEN);
> -
>   	/* disable IRQ */
>   	reg_clear(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);
>   
> @@ -1042,9 +1036,13 @@ static const struct drm_encoder_funcs ltdc_encoder_funcs = {
>   static void ltdc_encoder_disable(struct drm_encoder *encoder)
>   {
>   	struct drm_device *ddev = encoder->dev;
> +	struct ltdc_device *ldev = ddev->dev_private;
>   
>   	DRM_DEBUG_DRIVER("\n");
>   
> +	/* Disable LTDC */
> +	reg_clear(ldev->regs, LTDC_GCR, GCR_LTDCEN);
> +
>   	/* Set to sleep state the pinctrl whatever type of encoder */
>   	pinctrl_pm_select_sleep_state(ddev->dev);
>   }
> @@ -1052,6 +1050,19 @@ static void ltdc_encoder_disable(struct drm_encoder *encoder)
>   static void ltdc_encoder_enable(struct drm_encoder *encoder)
>   {
>   	struct drm_device *ddev = encoder->dev;
> +	struct ltdc_device *ldev = ddev->dev_private;
> +
> +	DRM_DEBUG_DRIVER("\n");
> +
> +	/* Enable LTDC */
> +	reg_set(ldev->regs, LTDC_GCR, GCR_LTDCEN);
> +}
> +
> +static void ltdc_encoder_mode_set(struct drm_encoder *encoder,
> +				  struct drm_display_mode *mode,
> +				  struct drm_display_mode *adjusted_mode)
> +{
> +	struct drm_device *ddev = encoder->dev;
>   
>   	DRM_DEBUG_DRIVER("\n");
>   
> @@ -1067,6 +1078,7 @@ static void ltdc_encoder_enable(struct drm_encoder *encoder)
>   static const struct drm_encoder_helper_funcs ltdc_encoder_helper_funcs = {
>   	.disable = ltdc_encoder_disable,
>   	.enable = ltdc_encoder_enable,
> +	.mode_set = ltdc_encoder_mode_set,
>   };
>   
>   static int ltdc_encoder_init(struct drm_device *ddev, struct drm_bridge *bridge)
>