| Message ID | 20240710-alpha-blending-v3-3-289c187f9c6f@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Support alpha blending in MTK display driver | expand |
Il 10/07/24 10:52, Hsiao Chien Sung via B4 Relay ha scritto: > From: Hsiao Chien Sung <shawn.sung@mediatek.com> > > Support "Pre-multiplied" alpha blending mode on in OVL. > Before this patch, only the "coverage" mode is supported. > > Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com> > Reviewed-by: CK Hu <ck.hu@mediatek.com> > --- > drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 32 +++++++++++++++++++++++++------- > 1 file changed, 25 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > index add671c38613..89b439dcf3a6 100644 > --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > @@ -56,8 +56,12 @@ > #define GMC_THRESHOLD_HIGH ((1 << GMC_THRESHOLD_BITS) / 4) > #define GMC_THRESHOLD_LOW ((1 << GMC_THRESHOLD_BITS) / 8) > > +#define OVL_CON_CLRFMT_MAN BIT(23) > #define OVL_CON_BYTE_SWAP BIT(24) > -#define OVL_CON_MTX_YUV_TO_RGB (6 << 16) > + > +/* OVL_CON_RGB_SWAP works only if OVL_CON_CLRFMT_MAN is enabled */ > +#define OVL_CON_RGB_SWAP BIT(25) > + > #define OVL_CON_CLRFMT_RGB (1 << 12) > #define OVL_CON_CLRFMT_ARGB8888 (2 << 12) > #define OVL_CON_CLRFMT_RGBA8888 (3 << 12) > @@ -65,6 +69,11 @@ > #define OVL_CON_CLRFMT_BGRA8888 (OVL_CON_CLRFMT_ARGB8888 | OVL_CON_BYTE_SWAP) > #define OVL_CON_CLRFMT_UYVY (4 << 12) > #define OVL_CON_CLRFMT_YUYV (5 << 12) > +#define OVL_CON_MTX_YUV_TO_RGB (6 << 16) > +#define OVL_CON_CLRFMT_PARGB8888 ((3 << 12) | OVL_CON_CLRFMT_MAN) Shouldn't this be (OVL_CON_CLRFMT_RGBA8888 | OVL_CON_CLRFMT_MAN) ?? That's getting written to the same register, so I'd guess this is like that; but then, if it is like that, why is it PARGB888 and not PRGBA888?! Regards, Angelo
Hi Angelo, On Wed, 2024-07-10 at 14:02 +0200, AngeloGioacchino Del Regno wrote: > Il 10/07/24 10:52, Hsiao Chien Sung via B4 Relay ha scritto: > > From: Hsiao Chien Sung <shawn.sung@mediatek.com> > > > > Support "Pre-multiplied" alpha blending mode on in OVL. > > Before this patch, only the "coverage" mode is supported. > > > > Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com> > > Reviewed-by: CK Hu <ck.hu@mediatek.com> > > --- > > drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 32 > > +++++++++++++++++++++++++------- > > 1 file changed, 25 insertions(+), 7 deletions(-) > > > > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > > b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > > index add671c38613..89b439dcf3a6 100644 > > --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > > +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > > @@ -56,8 +56,12 @@ > > #define GMC_THRESHOLD_HIGH ((1 << GMC_THRESHOLD_BITS) / 4) > > #define GMC_THRESHOLD_LOW ((1 << GMC_THRESHOLD_BITS) / 8) > > > > +#define OVL_CON_CLRFMT_MAN BIT(23) > > #define OVL_CON_BYTE_SWAP BIT(24) > > -#define OVL_CON_MTX_YUV_TO_RGB (6 << 16) > > + > > +/* OVL_CON_RGB_SWAP works only if OVL_CON_CLRFMT_MAN is enabled */ > > +#define OVL_CON_RGB_SWAP BIT(25) > > + > > #define OVL_CON_CLRFMT_RGB (1 << 12) > > #define OVL_CON_CLRFMT_ARGB8888 (2 << 12) > > #define OVL_CON_CLRFMT_RGBA8888 (3 << 12) > > @@ -65,6 +69,11 @@ > > #define OVL_CON_CLRFMT_BGRA8888 (OVL_CON_CLRFMT_ARGB8888 | > > OVL_CON_BYTE_SWAP) > > #define OVL_CON_CLRFMT_UYVY (4 << 12) > > #define OVL_CON_CLRFMT_YUYV (5 << 12) > > +#define OVL_CON_MTX_YUV_TO_RGB (6 << 16) > > +#define OVL_CON_CLRFMT_PARGB8888 ((3 << 12) | OVL_CON_CLRFMT_MAN) > > > Shouldn't this be (OVL_CON_CLRFMT_RGBA8888 | OVL_CON_CLRFMT_MAN) ?? > > That's getting written to the same register, so I'd guess this is > like that; but > then, if it is like that, why is it PARGB888 and not PRGBA888?! > Thank you for highlighting this important point. As whether OVL_CON_CLRFMT_MAN bit is enabled, (3 << 12) means different formats in the datasheet, and this function also confused us very much at first. To prevent any similar misunderstandings going forward, instead of reusing the MACRO you mentioned, we intetionally redefined OVL_CON_CLRFMT_PARGB8888 using bit operation again, although this approach seems to cause another confusion. Regards, Shawn
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c index add671c38613..89b439dcf3a6 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c @@ -56,8 +56,12 @@ #define GMC_THRESHOLD_HIGH ((1 << GMC_THRESHOLD_BITS) / 4) #define GMC_THRESHOLD_LOW ((1 << GMC_THRESHOLD_BITS) / 8) +#define OVL_CON_CLRFMT_MAN BIT(23) #define OVL_CON_BYTE_SWAP BIT(24) -#define OVL_CON_MTX_YUV_TO_RGB (6 << 16) + +/* OVL_CON_RGB_SWAP works only if OVL_CON_CLRFMT_MAN is enabled */ +#define OVL_CON_RGB_SWAP BIT(25) + #define OVL_CON_CLRFMT_RGB (1 << 12) #define OVL_CON_CLRFMT_ARGB8888 (2 << 12) #define OVL_CON_CLRFMT_RGBA8888 (3 << 12) @@ -65,6 +69,11 @@ #define OVL_CON_CLRFMT_BGRA8888 (OVL_CON_CLRFMT_ARGB8888 | OVL_CON_BYTE_SWAP) #define OVL_CON_CLRFMT_UYVY (4 << 12) #define OVL_CON_CLRFMT_YUYV (5 << 12) +#define OVL_CON_MTX_YUV_TO_RGB (6 << 16) +#define OVL_CON_CLRFMT_PARGB8888 ((3 << 12) | OVL_CON_CLRFMT_MAN) +#define OVL_CON_CLRFMT_PABGR8888 (OVL_CON_CLRFMT_PARGB8888 | OVL_CON_RGB_SWAP) +#define OVL_CON_CLRFMT_PBGRA8888 (OVL_CON_CLRFMT_PARGB8888 | OVL_CON_BYTE_SWAP) +#define OVL_CON_CLRFMT_PRGBA8888 (OVL_CON_CLRFMT_PABGR8888 | OVL_CON_BYTE_SWAP) #define OVL_CON_CLRFMT_RGB565(ovl) ((ovl)->data->fmt_rgb565_is_0 ? \ 0 : OVL_CON_CLRFMT_RGB) #define OVL_CON_CLRFMT_RGB888(ovl) ((ovl)->data->fmt_rgb565_is_0 ? \ @@ -377,7 +386,8 @@ void mtk_ovl_layer_off(struct device *dev, unsigned int idx, DISP_REG_OVL_RDMA_CTRL(idx)); } -static unsigned int ovl_fmt_convert(struct mtk_disp_ovl *ovl, unsigned int fmt) +static unsigned int ovl_fmt_convert(struct mtk_disp_ovl *ovl, unsigned int fmt, + unsigned int blend_mode) { /* The return value in switch "MEM_MODE_INPUT_FORMAT_XXX" * is defined in mediatek HW data sheet. @@ -398,22 +408,30 @@ static unsigned int ovl_fmt_convert(struct mtk_disp_ovl *ovl, unsigned int fmt) case DRM_FORMAT_RGBA8888: case DRM_FORMAT_RGBX1010102: case DRM_FORMAT_RGBA1010102: - return OVL_CON_CLRFMT_RGBA8888; + return blend_mode == DRM_MODE_BLEND_COVERAGE ? + OVL_CON_CLRFMT_RGBA8888 : + OVL_CON_CLRFMT_PRGBA8888; case DRM_FORMAT_BGRX8888: case DRM_FORMAT_BGRA8888: case DRM_FORMAT_BGRX1010102: case DRM_FORMAT_BGRA1010102: - return OVL_CON_CLRFMT_BGRA8888; + return blend_mode == DRM_MODE_BLEND_COVERAGE ? + OVL_CON_CLRFMT_BGRA8888 : + OVL_CON_CLRFMT_PBGRA8888; case DRM_FORMAT_XRGB8888: case DRM_FORMAT_ARGB8888: case DRM_FORMAT_XRGB2101010: case DRM_FORMAT_ARGB2101010: - return OVL_CON_CLRFMT_ARGB8888; + return blend_mode == DRM_MODE_BLEND_COVERAGE ? + OVL_CON_CLRFMT_ARGB8888 : + OVL_CON_CLRFMT_PARGB8888; case DRM_FORMAT_XBGR8888: case DRM_FORMAT_ABGR8888: case DRM_FORMAT_XBGR2101010: case DRM_FORMAT_ABGR2101010: - return OVL_CON_CLRFMT_ABGR8888; + return blend_mode == DRM_MODE_BLEND_COVERAGE ? + OVL_CON_CLRFMT_ABGR8888 : + OVL_CON_CLRFMT_PABGR8888; case DRM_FORMAT_UYVY: return OVL_CON_CLRFMT_UYVY | OVL_CON_MTX_YUV_TO_RGB; case DRM_FORMAT_YUYV: @@ -453,7 +471,7 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx, return; } - con = ovl_fmt_convert(ovl, fmt); + con = ovl_fmt_convert(ovl, fmt, blend_mode); if (state->base.fb) { con |= OVL_CON_AEN; con |= state->base.alpha & OVL_CON_ALPHA;