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authorPhilipp Zabel <p.zabel@pengutronix.de>2015-01-09 13:03:13 +0300
committerPhilipp Zabel <p.zabel@pengutronix.de>2017-03-15 17:42:31 +0300
commite72db3b1e50febff493bc5e3fb57da9cb8cc3d91 (patch)
tree3ad57c2c2fe02185979ab99f6584c32b06c2431d /drivers/gpu
parentba2b5277dc52cc96944d9765281bdf1e12681f66 (diff)
downloadlinux-e72db3b1e50febff493bc5e3fb57da9cb8cc3d91.tar.xz
gpu: ipu-v3: add support for separate alpha channels
The IPUv3 can read 8-bit alpha values from a separate IDMAC channel driven by the Alpha Transparency Controller (ATC) for the graphics IDMAC channels. This allows to reduce memory bandwidth via a conditional read mechanism or to support planar YUV formats with alpha transparency. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/ipu-v3/ipu-common.c6
-rw-r--r--drivers/gpu/ipu-v3/ipu-cpmem.c57
2 files changed, 63 insertions, 0 deletions
diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c
index 8a32ed25a1c2..448043c051e9 100644
--- a/drivers/gpu/ipu-v3/ipu-common.c
+++ b/drivers/gpu/ipu-v3/ipu-common.c
@@ -83,6 +83,12 @@ enum ipu_color_space ipu_drm_fourcc_to_colorspace(u32 drm_fourcc)
case DRM_FORMAT_ABGR8888:
case DRM_FORMAT_RGBA8888:
case DRM_FORMAT_BGRA8888:
+ case DRM_FORMAT_RGB565_A8:
+ case DRM_FORMAT_BGR565_A8:
+ case DRM_FORMAT_RGB888_A8:
+ case DRM_FORMAT_BGR888_A8:
+ case DRM_FORMAT_RGBX8888_A8:
+ case DRM_FORMAT_BGRX8888_A8:
return IPUV3_COLORSPACE_RGB;
case DRM_FORMAT_YUYV:
case DRM_FORMAT_UYVY:
diff --git a/drivers/gpu/ipu-v3/ipu-cpmem.c b/drivers/gpu/ipu-v3/ipu-cpmem.c
index b72f725e00b5..114160dfc3ad 100644
--- a/drivers/gpu/ipu-v3/ipu-cpmem.c
+++ b/drivers/gpu/ipu-v3/ipu-cpmem.c
@@ -537,6 +537,43 @@ static const struct ipu_rgb def_bgra_16 = {
#define UV2_OFFSET(pix, x, y) ((pix->width * pix->height) + \
(pix->width * y) + (x))
+#define NUM_ALPHA_CHANNELS 7
+
+/* See Table 37-12. Alpha channels mapping. */
+static int ipu_channel_albm(int ch_num)
+{
+ switch (ch_num) {
+ case IPUV3_CHANNEL_G_MEM_IC_PRP_VF: return 0;
+ case IPUV3_CHANNEL_G_MEM_IC_PP: return 1;
+ case IPUV3_CHANNEL_MEM_FG_SYNC: return 2;
+ case IPUV3_CHANNEL_MEM_FG_ASYNC: return 3;
+ case IPUV3_CHANNEL_MEM_BG_SYNC: return 4;
+ case IPUV3_CHANNEL_MEM_BG_ASYNC: return 5;
+ case IPUV3_CHANNEL_MEM_VDI_PLANE1_COMB: return 6;
+ default:
+ return -EINVAL;
+ }
+}
+
+static void ipu_cpmem_set_separate_alpha(struct ipuv3_channel *ch)
+{
+ struct ipu_soc *ipu = ch->ipu;
+ int albm;
+ u32 val;
+
+ albm = ipu_channel_albm(ch->num);
+ if (albm < 0)
+ return;
+
+ ipu_ch_param_write_field(ch, IPU_FIELD_ALU, 1);
+ ipu_ch_param_write_field(ch, IPU_FIELD_ALBM, albm);
+ ipu_ch_param_write_field(ch, IPU_FIELD_CRE, 1);
+
+ val = ipu_idmac_read(ipu, IDMAC_SEP_ALPHA);
+ val |= BIT(ch->num);
+ ipu_idmac_write(ipu, val, IDMAC_SEP_ALPHA);
+}
+
int ipu_cpmem_set_fmt(struct ipuv3_channel *ch, u32 drm_fourcc)
{
switch (drm_fourcc) {
@@ -599,22 +636,28 @@ int ipu_cpmem_set_fmt(struct ipuv3_channel *ch, u32 drm_fourcc)
break;
case DRM_FORMAT_RGBA8888:
case DRM_FORMAT_RGBX8888:
+ case DRM_FORMAT_RGBX8888_A8:
ipu_cpmem_set_format_rgb(ch, &def_rgbx_32);
break;
case DRM_FORMAT_BGRA8888:
case DRM_FORMAT_BGRX8888:
+ case DRM_FORMAT_BGRX8888_A8:
ipu_cpmem_set_format_rgb(ch, &def_bgrx_32);
break;
case DRM_FORMAT_BGR888:
+ case DRM_FORMAT_BGR888_A8:
ipu_cpmem_set_format_rgb(ch, &def_bgr_24);
break;
case DRM_FORMAT_RGB888:
+ case DRM_FORMAT_RGB888_A8:
ipu_cpmem_set_format_rgb(ch, &def_rgb_24);
break;
case DRM_FORMAT_RGB565:
+ case DRM_FORMAT_RGB565_A8:
ipu_cpmem_set_format_rgb(ch, &def_rgb_16);
break;
case DRM_FORMAT_BGR565:
+ case DRM_FORMAT_BGR565_A8:
ipu_cpmem_set_format_rgb(ch, &def_bgr_16);
break;
case DRM_FORMAT_ARGB1555:
@@ -636,6 +679,20 @@ int ipu_cpmem_set_fmt(struct ipuv3_channel *ch, u32 drm_fourcc)
return -EINVAL;
}
+ switch (drm_fourcc) {
+ case DRM_FORMAT_RGB565_A8:
+ case DRM_FORMAT_BGR565_A8:
+ case DRM_FORMAT_RGB888_A8:
+ case DRM_FORMAT_BGR888_A8:
+ case DRM_FORMAT_RGBX8888_A8:
+ case DRM_FORMAT_BGRX8888_A8:
+ ipu_ch_param_write_field(ch, IPU_FIELD_WID3, 7);
+ ipu_cpmem_set_separate_alpha(ch);
+ break;
+ default:
+ break;
+ }
+
return 0;
}
EXPORT_SYMBOL_GPL(ipu_cpmem_set_fmt);