Re: [PATCH 3/7] drm/omap: fix missing scaler pixel fmt limitations

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Tomi,

Thank you for the patch.

On Mon, Sep 02, 2019 at 03:53:55PM +0300, Tomi Valkeinen wrote:
> OMAP2 and OMAP3/AM4 have limitations with the scaler:
> - OMAP2 can only scale XRGB8888
> - OMAP3/AM4 can only scale XRGB8888, RGB565, YUYV and UYVY
> 
> The driver doesn't check these limitations, which leads to sync-lost
> floods.
> 
> This patch adds a check for the pixel formats when scaling.
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
> ---
>  drivers/gpu/drm/omapdrm/dss/dispc.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/drivers/gpu/drm/omapdrm/dss/dispc.c b/drivers/gpu/drm/omapdrm/dss/dispc.c
> index c6da33e7014f..7d87d60edb80 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dispc.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dispc.c
> @@ -114,6 +114,7 @@ struct dispc_features {
>  	const unsigned int num_reg_fields;
>  	const enum omap_overlay_caps *overlay_caps;
>  	const u32 **supported_color_modes;
> +	const u32 *supported_scaler_color_modes;
>  	unsigned int num_mgrs;
>  	unsigned int num_ovls;
>  	unsigned int buffer_size_unit;
> @@ -2498,6 +2499,19 @@ static int dispc_ovl_calc_scaling(struct dispc_device *dispc,
>  	if (width == out_width && height == out_height)
>  		return 0;
>  
> +	if (dispc->feat->supported_scaler_color_modes) {
> +		const u32 *modes = dispc->feat->supported_scaler_color_modes;
> +		int i;

i is never negative and can thus be an unsigned int. Apart from that,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> +
> +		for (i = 0; modes[i]; ++i) {
> +			if (modes[i] == fourcc)
> +				break;
> +		}
> +
> +		if (modes[i] == 0)
> +			return -EINVAL;
> +	}
> +
>  	if (plane == OMAP_DSS_WB) {
>  		switch (fourcc) {
>  		case DRM_FORMAT_NV12:
> @@ -4213,6 +4227,12 @@ static const u32 *omap4_dispc_supported_color_modes[] = {
>  	DRM_FORMAT_RGBX8888),
>  };
>  
> +static const u32 omap3_dispc_supported_scaler_color_modes[] = {
> +	DRM_FORMAT_XRGB8888, DRM_FORMAT_RGB565, DRM_FORMAT_YUYV,
> +	DRM_FORMAT_UYVY,
> +	0,
> +};
> +
>  static const struct dispc_features omap24xx_dispc_feats = {
>  	.sw_start		=	5,
>  	.fp_start		=	15,
> @@ -4241,6 +4261,7 @@ static const struct dispc_features omap24xx_dispc_feats = {
>  	.num_reg_fields		=	ARRAY_SIZE(omap2_dispc_reg_fields),
>  	.overlay_caps		=	omap2_dispc_overlay_caps,
>  	.supported_color_modes	=	omap2_dispc_supported_color_modes,
> +	.supported_scaler_color_modes = COLOR_ARRAY(DRM_FORMAT_XRGB8888),
>  	.num_mgrs		=	2,
>  	.num_ovls		=	3,
>  	.buffer_size_unit	=	1,
> @@ -4275,6 +4296,7 @@ static const struct dispc_features omap34xx_rev1_0_dispc_feats = {
>  	.num_reg_fields		=	ARRAY_SIZE(omap3_dispc_reg_fields),
>  	.overlay_caps		=	omap3430_dispc_overlay_caps,
>  	.supported_color_modes	=	omap3_dispc_supported_color_modes,
> +	.supported_scaler_color_modes = omap3_dispc_supported_scaler_color_modes,
>  	.num_mgrs		=	2,
>  	.num_ovls		=	3,
>  	.buffer_size_unit	=	1,
> @@ -4309,6 +4331,7 @@ static const struct dispc_features omap34xx_rev3_0_dispc_feats = {
>  	.num_reg_fields		=	ARRAY_SIZE(omap3_dispc_reg_fields),
>  	.overlay_caps		=	omap3430_dispc_overlay_caps,
>  	.supported_color_modes	=	omap3_dispc_supported_color_modes,
> +	.supported_scaler_color_modes = omap3_dispc_supported_scaler_color_modes,
>  	.num_mgrs		=	2,
>  	.num_ovls		=	3,
>  	.buffer_size_unit	=	1,
> @@ -4343,6 +4366,7 @@ static const struct dispc_features omap36xx_dispc_feats = {
>  	.num_reg_fields		=	ARRAY_SIZE(omap3_dispc_reg_fields),
>  	.overlay_caps		=	omap3630_dispc_overlay_caps,
>  	.supported_color_modes	=	omap3_dispc_supported_color_modes,
> +	.supported_scaler_color_modes = omap3_dispc_supported_scaler_color_modes,
>  	.num_mgrs		=	2,
>  	.num_ovls		=	3,
>  	.buffer_size_unit	=	1,
> @@ -4377,6 +4401,7 @@ static const struct dispc_features am43xx_dispc_feats = {
>  	.num_reg_fields		=	ARRAY_SIZE(omap3_dispc_reg_fields),
>  	.overlay_caps		=	omap3430_dispc_overlay_caps,
>  	.supported_color_modes	=	omap3_dispc_supported_color_modes,
> +	.supported_scaler_color_modes = omap3_dispc_supported_scaler_color_modes,
>  	.num_mgrs		=	1,
>  	.num_ovls		=	3,
>  	.buffer_size_unit	=	1,

-- 
Regards,

Laurent Pinchart
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