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drm/stm: ltdc: add non-alpha color formats 

ltdc supports natively some color formats with alpha (like
ARGB8888, ARGB1555, ARGB4444...). Related non-alpha formats are
supported too (ARGB8888->XRGB8888, ARGB4444->XRGB4444...) by
adjusting ltdc blending factors.

Note: Wayland/Weston requests by default the non-alpha XRGB8888
color format.

Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
Reviewed-by: Yannick Fertré <yannick.fertre@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180201104243.20726-2-philippe.cornu@st.com
This commit is contained in:
Philippe CORNU 2018-02-01 11:42:42 +01:00 committed by Benjamin Gaignard
parent f03e19579c
commit aefa830199
1 changed files with 31 additions and 2 deletions
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33
drivers/gpu/drm/stm/ltdc.c
View File

@ -328,6 +328,26 @@ static inline u32 to_drm_pixelformat(enum ltdc_pix_fmt pf)
}
}
static inline u32 get_pixelformat_without_alpha(u32 drm)
{
switch (drm) {
case DRM_FORMAT_ARGB4444:
return DRM_FORMAT_XRGB4444;
case DRM_FORMAT_RGBA4444:
return DRM_FORMAT_RGBX4444;
case DRM_FORMAT_ARGB1555:
return DRM_FORMAT_XRGB1555;
case DRM_FORMAT_RGBA5551:
return DRM_FORMAT_RGBX5551;
case DRM_FORMAT_ARGB8888:
return DRM_FORMAT_XRGB8888;
case DRM_FORMAT_RGBA8888:
return DRM_FORMAT_RGBX8888;
default:
return 0;
}
}
static irqreturn_t ltdc_irq_thread(int irq, void *arg)
{
struct drm_device *ddev = arg;
@ -680,6 +700,9 @@ static void ltdc_plane_atomic_update(struct drm_plane *plane,
/* Specifies the blending factors */
val = BF1_PAXCA | BF2_1PAXCA;
if (!fb->format->has_alpha)
val = BF1_CA | BF2_1CA;
reg_update_bits(ldev->regs, LTDC_L1BFCR + lofs,
LXBFCR_BF2 | LXBFCR_BF1, val);
@ -747,8 +770,8 @@ static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
struct device *dev = ddev->dev;
struct drm_plane *plane;
unsigned int i, nb_fmt = 0;
u32 formats[NB_PF];
u32 drm_fmt;
u32 formats[NB_PF * 2];
u32 drm_fmt, drm_fmt_no_alpha;
int ret;
/* Get supported pixel formats */
@ -757,6 +780,12 @@ static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
if (!drm_fmt)
continue;
formats[nb_fmt++] = drm_fmt;
/* Add the no-alpha related format if any & supported */
drm_fmt_no_alpha = get_pixelformat_without_alpha(drm_fmt);
if (!drm_fmt_no_alpha)
continue;
formats[nb_fmt++] = drm_fmt_no_alpha;
}
plane = devm_kzalloc(dev, sizeof(*plane), GFP_KERNEL);