<html><body><p> <pre> Hi, Shawn: On Fri, 2024-03-22 at 13:28 +0800, Shawn Sung wrote: > From: Hsiao Chien Sung <shawn.sung@mediatek.com> > > Support "Pre-multiplied" blend mode on MediaTek's chips. > Before this patch, only the "Coverage" mode is supported. > > Please refer to the description of the commit > "drm/mediatek: Support alpha blending in display driver" > for more information. > > Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com> > --- > drivers/gpu/drm/mediatek/mtk_ethdr.c | 25 ++++++++++++++++++------- > 1 file changed, 18 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/mediatek/mtk_ethdr.c > b/drivers/gpu/drm/mediatek/mtk_ethdr.c > index 6bf398850e85f..4b12ca285e84b 100644 > --- a/drivers/gpu/drm/mediatek/mtk_ethdr.c > +++ b/drivers/gpu/drm/mediatek/mtk_ethdr.c > @@ -5,6 +5,7 @@ > > #include <drm/drm_fourcc.h> > #include <drm/drm_framebuffer.h> > +#include <drm/drm_blend.h> > #include <linux/clk.h> > #include <linux/component.h> > #include <linux/of.h> > @@ -35,6 +36,7 @@ > #define MIX_SRC_L0_ENBIT(0) > #define MIX_L_SRC_CON(n)(0x28 + 0x18 * (n)) > #define NON_PREMULTI_SOURCE(2 << 12) > +#define PREMULTI_SOURCE(3 << 12) > #define MIX_L_SRC_SIZE(n)(0x30 + 0x18 * (n)) > #define MIX_L_SRC_OFFSET(n)(0x34 + 0x18 * (n)) > #define MIX_FUNC_DCM00x120 > @@ -153,7 +155,8 @@ void mtk_ethdr_layer_config(struct device *dev, > unsigned int idx, > struct mtk_plane_pending_state *pending = &state->pending; > unsigned int offset = (pending->x & 1) << 31 | pending->y << 16 > | pending->x; > unsigned int align_width = ALIGN_DOWN(pending->width, 2); > -unsigned int alpha_con = 0; > +unsigned int mix_con = NON_PREMULTI_SOURCE; I think you should not assign here. You should choose one of PREMULTI_SOURCE or NON_PREMULTI_SOURCE later. > +bool replace_src_a = false; > > dev_dbg(dev, "%s+ idx:%d", __func__, idx); > > @@ -170,19 +173,27 @@ void mtk_ethdr_layer_config(struct device *dev, > unsigned int idx, > return; > } > > -if (state->base.fb && state->base.fb->format->has_alpha) > -alpha_con = MIXER_ALPHA_AEN | MIXER_ALPHA; > +mix_con |= MIXER_ALPHA_AEN | (state->base.alpha & MIXER_ALPHA); Now support pixel alpha, and this seems to support plane alpha. Separate this to another patch. > > -mtk_mmsys_mixer_in_config(priv->mmsys_dev, idx + 1, alpha_con ? > false : true, > - DEFAULT_9BIT_ALPHA, > +if (state->base.pixel_blend_mode != DRM_MODE_BLEND_COVERAGE) > +mix_con |= PREMULTI_SOURCE; > + > +if (state->base.fb && !state->base.fb->format->has_alpha) { > +/* > + * Mixer doesn't support CONST_BLD mode, > + * use a trick to make the output equivalent > + */ > +replace_src_a = true; Ditto. Regards, CK > +} > + > +mtk_mmsys_mixer_in_config(priv->mmsys_dev, idx + 1, > replace_src_a, MIXER_ALPHA, > pending->x & 1 ? > MIXER_INX_MODE_EVEN_EXTEND : > MIXER_INX_MODE_BYPASS, align_width / > 2 - 1, cmdq_pkt); > > mtk_ddp_write(cmdq_pkt, pending->height << 16 | align_width, > &mixer->cmdq_base, > mixer->regs, MIX_L_SRC_SIZE(idx)); > mtk_ddp_write(cmdq_pkt, offset, &mixer->cmdq_base, mixer->regs, > MIX_L_SRC_OFFSET(idx)); > -mtk_ddp_write_mask(cmdq_pkt, alpha_con, &mixer->cmdq_base, > mixer->regs, MIX_L_SRC_CON(idx), > - 0x1ff); > +mtk_ddp_write(cmdq_pkt, mix_con, &mixer->cmdq_base, mixer- > >regs, MIX_L_SRC_CON(idx)); > mtk_ddp_write_mask(cmdq_pkt, BIT(idx), &mixer->cmdq_base, > mixer->regs, MIX_SRC_CON, > BIT(idx)); > } </pre> </p></body></html><pre>************* MEDIATEK Confidentiality Notice ******************** The information contained in this e-mail message (including any attachments) may be confidential, proprietary, privileged, or otherwise exempt from disclosure under applicable laws. It is intended to be conveyed only to the designated recipient(s). Any use, dissemination, distribution, printing, retaining or copying of this e-mail (including its attachments) by unintended recipient(s) is strictly prohibited and may be unlawful. If you are not an intended recipient of this e-mail, or believe that you have received this e-mail in error, please notify the sender immediately (by replying to this e-mail), delete any and all copies of this e-mail (including any attachments) from your system, and do not disclose the content of this e-mail to any other person. Thank you! </pre>