linux-kernel - Re: [PATCH] drm/stm: ltdc: add modifier support

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Date:   Fri, 5 Apr 2019 16:32:14 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Yannick FERTRE <yannick.fertre@...com>,
        Benjamin GAIGNARD <benjamin.gaignard@...com>,
        Vincent ABRIOU <vincent.abriou@...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: add modifier support



On 4/3/19 11:25 AM, Yannick Fertré wrote:
> Signed-off-by: Mickael Reulier <mickael.reulier@...com>
> Signed-off-by: Yannick Fertré <yannick.fertre@...com>
> ---
>   drivers/gpu/drm/stm/ltdc.c | 21 ++++++++++++++++++++-
>   1 file changed, 20 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> index b1741a9..6fa8fbc 100644
> --- a/drivers/gpu/drm/stm/ltdc.c
> +++ b/drivers/gpu/drm/stm/ltdc.c
> @@ -232,6 +232,11 @@ static const enum ltdc_pix_fmt ltdc_pix_fmt_a1[NB_PF] = {
>   	PF_ARGB4444		/* 0x07 */
>   };
>   
> +static const u64 ltdc_format_modifiers[] = {
> +	DRM_FORMAT_MOD_LINEAR,
> +	DRM_FORMAT_MOD_INVALID
> +};
> +
>   static inline u32 reg_read(void __iomem *base, u32 reg)
>   {
>   	return readl_relaxed(base + reg);
> @@ -864,6 +869,16 @@ static void ltdc_plane_atomic_print_state(struct drm_printer *p,
>   	fpsi->counter = 0;
>   }
>   
> +static bool ltdc_plane_format_mod_supported(struct drm_plane *plane,
> +					    u32 format,
> +					    u64 modifier)
> +{
> +	if (modifier == DRM_FORMAT_MOD_LINEAR)
> +		return true;
> +
> +	return false;
> +}
> +
>   static const struct drm_plane_funcs ltdc_plane_funcs = {
>   	.update_plane = drm_atomic_helper_update_plane,
>   	.disable_plane = drm_atomic_helper_disable_plane,
> @@ -872,6 +887,7 @@ static const struct drm_plane_funcs ltdc_plane_funcs = {
>   	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
>   	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
>   	.atomic_print_state = ltdc_plane_atomic_print_state,
> +	.format_mod_supported = ltdc_plane_format_mod_supported,
>   };
>   
>   static const struct drm_plane_helper_funcs ltdc_plane_helper_funcs = {
> @@ -890,6 +906,7 @@ static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
>   	unsigned int i, nb_fmt = 0;
>   	u32 formats[NB_PF * 2];
>   	u32 drm_fmt, drm_fmt_no_alpha;
> +	const u64 *modifiers = ltdc_format_modifiers;
>   	int ret;
>   
>   	/* Get supported pixel formats */
> @@ -918,7 +935,7 @@ static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
>   
>   	ret = drm_universal_plane_init(ddev, plane, possible_crtcs,
>   				       &ltdc_plane_funcs, formats, nb_fmt,
> -				       NULL, type, NULL);
> +				       modifiers, type, NULL);
>   	if (ret < 0)
>   		return NULL;
>   
> @@ -1179,6 +1196,8 @@ int ltdc_load(struct drm_device *ddev)
>   		goto err;
>   	}
>   
> +	ddev->mode_config.allow_fb_modifiers = true;
> +


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

Philippe :)

>   	ret = ltdc_crtc_init(ddev, crtc);
>   	if (ret) {
>   		DRM_ERROR("Failed to init crtc\n");
>