| Message ID | 20241008064716.14670-2-jason-jh.lin@mediatek.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Fix degradation problem of alpha blending series | expand |
… > Note that ignore pixel alpha bit is not supported if the SoC is not > supported the blend_modes. supporting the blending modes? > So it will break the original setting of XRGB8888 foramt for the format? > Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com> Would a personal name without a dot be preferred according to the Developer's Certificate of Origin? https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.12-rc2#n396 Regards, Markus
On Tue, 2024-10-08 at 09:55 +0200, Markus Elfring wrote: > > External email : Please do not click links or open attachments until > you have verified the sender or the content. > … > > Note that ignore pixel alpha bit is not supported if the SoC is not > > supported the blend_modes. > > supporting the blending modes? > > > > So it will break the original setting of XRGB8888 foramt for the > > format? Thanks! I'll fix this typo at the next version. Regards, Jason-JH.Lin > > > > Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com> > > Would a personal name without a dot be preferred > according to the Developer's Certificate of Origin? > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.12-rc2#n396 > > Regards, > Markus
Hi, Jason: On Tue, 2024-10-08 at 14:47 +0800, Jason-JH.Lin wrote: > OVL_CON_AEN is for alpha blending enable. > For the SoC that is supported the blend_modes, OVL_CON_AEN will always > enabled to use constant alpha and then use the ignore_pixel_alpha bit > to do the alpha blending for XRGB8888 format. > Note that ignore pixel alpha bit is not supported if the SoC is not > supported the blend_modes. > So it will break the original setting of XRGB8888 foramt for the > blend_modes unsupported SoCs, such as MT8173. > > To fix the downgrade issue, enable alpha blending only when a valid > blend_mode or has_alpha is set. After fixing the typo mentioned by Markus, Reviewed-by: CK Hu <ck.hu@mediatek.com> > > Fixes: bc46eb5d5d77 ("drm/mediatek: Support DRM plane alpha in OVL") > Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com> > --- > drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > index 89b439dcf3a6..047cd1796a51 100644 > --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > @@ -473,8 +473,14 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx, > > con = ovl_fmt_convert(ovl, fmt, blend_mode); > if (state->base.fb) { > - con |= OVL_CON_AEN; > con |= state->base.alpha & OVL_CON_ALPHA; > + > + /* > + * For blend_modes supported SoCs, always enable alpha blending. > + * For blend_modes unsupported SoCs, enable alpha blending when has_alpha is set. > + */ > + if (blend_mode || state->base.fb->format->has_alpha) > + con |= OVL_CON_AEN; > } > > /* CONST_BLD must be enabled for XRGB formats although the alpha channel
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c index 89b439dcf3a6..047cd1796a51 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c @@ -473,8 +473,14 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx, con = ovl_fmt_convert(ovl, fmt, blend_mode); if (state->base.fb) { - con |= OVL_CON_AEN; con |= state->base.alpha & OVL_CON_ALPHA; + + /* + * For blend_modes supported SoCs, always enable alpha blending. + * For blend_modes unsupported SoCs, enable alpha blending when has_alpha is set. + */ + if (blend_mode || state->base.fb->format->has_alpha) + con |= OVL_CON_AEN; } /* CONST_BLD must be enabled for XRGB formats although the alpha channel
OVL_CON_AEN is for alpha blending enable. For the SoC that is supported the blend_modes, OVL_CON_AEN will always enabled to use constant alpha and then use the ignore_pixel_alpha bit to do the alpha blending for XRGB8888 format. Note that ignore pixel alpha bit is not supported if the SoC is not supported the blend_modes. So it will break the original setting of XRGB8888 foramt for the blend_modes unsupported SoCs, such as MT8173. To fix the downgrade issue, enable alpha blending only when a valid blend_mode or has_alpha is set. Fixes: bc46eb5d5d77 ("drm/mediatek: Support DRM plane alpha in OVL") Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com> --- drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)