<html><body><p> <pre> On Fri, 2024-06-14 at 10:46 +0800, Shawn Sung wrote: > From: Hsiao Chien Sung <shawn.sung@mediatek.com> > > CONST_BLD must be enabled for XRGB formats although the alpha channel > can be ignored, or OVL will still read the value from memory. > This error only affects CRC generation. > > Fixes: c410fa9b07c3 ("drm/mediatek: Add AFBC support to Mediatek DRM driver") Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.") [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/mediatek?h=v6.10-rc3&id=119f5173628aa7a0c3cf9db83460d40709e8241d Regards, CK > Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com> > --- > drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 14 ++++++++++++-- > 1 file changed, 12 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > index 946b87ec48ca..fd390fb83d0e 100644 > --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c > @@ -38,6 +38,7 @@ > #define DISP_REG_OVL_PITCH_MSB(n)(0x0040 + 0x20 * (n)) > #define OVL_PITCH_MSB_2ND_SUBBUFBIT(16) > #define DISP_REG_OVL_PITCH(n)(0x0044 + 0x20 * (n)) > +#define OVL_CONST_BLENDBIT(28) > #define DISP_REG_OVL_RDMA_CTRL(n)(0x00c0 + 0x20 * (n)) > #define DISP_REG_OVL_RDMA_GMC(n)(0x00c8 + 0x20 * (n)) > #define DISP_REG_OVL_ADDR_MT27010x0040 > @@ -428,6 +429,7 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx, > unsigned int fmt = pending->format; > unsigned int offset = (pending->y << 16) | pending->x; > unsigned int src_size = (pending->height << 16) | pending->width; > +unsigned int ignore_pixel_alpha = 0; > unsigned int con; > bool is_afbc = pending->modifier != DRM_FORMAT_MOD_LINEAR; > union overlay_pitch { > @@ -449,6 +451,14 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx, > if (state->base.fb && state->base.fb->format->has_alpha) > con |= OVL_CON_AEN | OVL_CON_ALPHA; > > +/* CONST_BLD must be enabled for XRGB formats although the alpha channel > + * can be ignored, or OVL will still read the value from memory. > + * For RGB888 related formats, whether CONST_BLD is enabled or not won't > + * affect the result. Therefore we use !has_alpha as the condition. > + */ > +if (state->base.fb && !state->base.fb->format->has_alpha) > +ignore_pixel_alpha = OVL_CONST_BLEND; > + > if (pending->rotation & DRM_MODE_REFLECT_Y) { > con |= OVL_CON_VIRT_FLIP; > addr += (pending->height - 1) * pending->pitch; > @@ -464,8 +474,8 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx, > > mtk_ddp_write_relaxed(cmdq_pkt, con, &ovl->cmdq_reg, ovl->regs, > DISP_REG_OVL_CON(idx)); > -mtk_ddp_write_relaxed(cmdq_pkt, overlay_pitch.split_pitch.lsb, &ovl->cmdq_reg, ovl->regs, > - DISP_REG_OVL_PITCH(idx)); > +mtk_ddp_write_relaxed(cmdq_pkt, overlay_pitch.split_pitch.lsb | ignore_pixel_alpha, > + &ovl->cmdq_reg, ovl->regs, DISP_REG_OVL_PITCH(idx)); > mtk_ddp_write_relaxed(cmdq_pkt, src_size, &ovl->cmdq_reg, ovl->regs, > DISP_REG_OVL_SRC_SIZE(idx)); > mtk_ddp_write_relaxed(cmdq_pkt, offset, &ovl->cmdq_reg, ovl->regs, </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>