diff options
Diffstat (limited to 'drivers/media/platform/vsp1/vsp1_rpf.c')
| -rw-r--r-- | drivers/media/platform/vsp1/vsp1_rpf.c | 57 |
1 files changed, 54 insertions, 3 deletions
diff --git a/drivers/media/platform/vsp1/vsp1_rpf.c b/drivers/media/platform/vsp1/vsp1_rpf.c index 5486ff5..49168db 100644 --- a/drivers/media/platform/vsp1/vsp1_rpf.c +++ b/drivers/media/platform/vsp1/vsp1_rpf.c @@ -141,9 +141,27 @@ static void rpf_configure(struct vsp1_entity *entity, (left << VI6_RPF_LOC_HCOORD_SHIFT) | (top << VI6_RPF_LOC_VCOORD_SHIFT)); - /* Use the alpha channel (extended to 8 bits) when available or an - * alpha value set through the V4L2_CID_ALPHA_COMPONENT control - * otherwise. Disable color keying. + /* On Gen2 use the alpha channel (extended to 8 bits) when available or + * a fixed alpha value set through the V4L2_CID_ALPHA_COMPONENT control + * otherwise. + * + * The Gen3 RPF has extended alpha capability and can both multiply the + * alpha channel by a fixed global alpha value, and multiply the pixel + * components to convert the input to premultiplied alpha. + * + * As alpha premultiplication is available in the BRU for both Gen2 and + * Gen3 we handle it there and use the Gen3 alpha multiplier for global + * alpha multiplication only. This however prevents conversion to + * premultiplied alpha if no BRU is present in the pipeline. If that use + * case turns out to be useful we will revisit the implementation (for + * Gen3 only). + * + * We enable alpha multiplication on Gen3 using the fixed alpha value + * set through the V4L2_CID_ALPHA_COMPONENT control when the input + * contains an alpha channel. On Gen2 the global alpha is ignored in + * that case. + * + * In all cases, disable color keying. */ vsp1_rpf_write(rpf, dl, VI6_RPF_ALPH_SEL, VI6_RPF_ALPH_SEL_AEXT_EXT | (fmtinfo->alpha ? VI6_RPF_ALPH_SEL_ASEL_PACKED @@ -152,10 +170,43 @@ static void rpf_configure(struct vsp1_entity *entity, vsp1_rpf_write(rpf, dl, VI6_RPF_VRTCOL_SET, rpf->alpha << VI6_RPF_VRTCOL_SET_LAYA_SHIFT); + if (entity->vsp1->info->gen == 3) { + u32 mult; + + if (fmtinfo->alpha) { + /* When the input contains an alpha channel enable the + * alpha multiplier. If the input is premultiplied we + * need to multiply both the alpha channel and the pixel + * components by the global alpha value to keep them + * premultiplied. Otherwise multiply the alpha channel + * only. + */ + bool premultiplied = format->flags + & V4L2_PIX_FMT_FLAG_PREMUL_ALPHA; + + mult = VI6_RPF_MULT_ALPHA_A_MMD_RATIO + | (premultiplied ? + VI6_RPF_MULT_ALPHA_P_MMD_RATIO : + VI6_RPF_MULT_ALPHA_P_MMD_NONE) + | (rpf->alpha << VI6_RPF_MULT_ALPHA_RATIO_SHIFT); + } else { + /* When the input doesn't contain an alpha channel the + * global alpha value is applied in the unpacking unit, + * the alpha multiplier isn't needed and must be + * disabled. + */ + mult = VI6_RPF_MULT_ALPHA_A_MMD_NONE + | VI6_RPF_MULT_ALPHA_P_MMD_NONE; + } + + vsp1_rpf_write(rpf, dl, VI6_RPF_MULT_ALPHA, mult); + } + vsp1_pipeline_propagate_alpha(pipe, &rpf->entity, dl, rpf->alpha); vsp1_rpf_write(rpf, dl, VI6_RPF_MSK_CTRL, 0); vsp1_rpf_write(rpf, dl, VI6_RPF_CKEY_CTRL, 0); + } static const struct vsp1_entity_operations rpf_entity_ops = { |
