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drm/sti: fallback for GDP scaling 

When a GDP gets a scale request (which it does not support), it accepts it
but crops or clamps and outputs a warning message.

Signed-off-by: Bich Hemon <bich.hemon@st.com>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: Vincent Abriou <vincent.abriou@st.com>
This commit is contained in:
Bich Hemon 2016-01-22 16:17:36 +01:00 committed by Vincent Abriou
parent c459489e54
commit a5b9a713f5
1 changed files with 31 additions and 5 deletions
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36
drivers/gpu/drm/sti/sti_gdp.c
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@ -361,6 +361,31 @@ static void sti_gdp_init(struct sti_gdp *gdp)
}
}
/**
* sti_gdp_get_dst
* @dev: device
* @dst: requested destination size
* @src: source size
*
* Return the cropped / clamped destination size
*
* RETURNS:
* cropped / clamped destination size
*/
static int sti_gdp_get_dst(struct device *dev, int dst, int src)
{
if (dst == src)
return dst;
if (dst < src) {
dev_dbg(dev, "WARNING: GDP scale not supported, will crop\n");
return dst;
}
dev_dbg(dev, "WARNING: GDP scale not supported, will clamp\n");
return src;
}
static void sti_gdp_atomic_update(struct drm_plane *drm_plane,
struct drm_plane_state *oldstate)
{
@ -399,8 +424,8 @@ static void sti_gdp_atomic_update(struct drm_plane *drm_plane,
/* src_x are in 16.16 format */
src_x = state->src_x >> 16;
src_y = state->src_y >> 16;
src_w = state->src_w >> 16;
src_h = state->src_h >> 16;
src_w = clamp_val(state->src_w >> 16, 0, GAM_GDP_SIZE_MAX);
src_h = clamp_val(state->src_h >> 16, 0, GAM_GDP_SIZE_MAX);
DRM_DEBUG_KMS("CRTC:%d (%s) drm plane:%d (%s)\n",
crtc->base.id, sti_mixer_to_str(mixer),
@ -448,10 +473,11 @@ static void sti_gdp_atomic_update(struct drm_plane *drm_plane,
/* input parameters */
top_field->gam_gdp_pmp = fb->pitches[0];
top_field->gam_gdp_size = clamp_val(src_h, 0, GAM_GDP_SIZE_MAX) << 16 |
clamp_val(src_w, 0, GAM_GDP_SIZE_MAX);
top_field->gam_gdp_size = src_h << 16 | src_w;
/* output parameters */
/* output parameters (clamped / cropped) */
dst_w = sti_gdp_get_dst(gdp->dev, dst_w, src_w);
dst_h = sti_gdp_get_dst(gdp->dev, dst_h, src_h);
ydo = sti_vtg_get_line_number(*mode, dst_y);
yds = sti_vtg_get_line_number(*mode, dst_y + dst_h - 1);
xdo = sti_vtg_get_pixel_number(*mode, dst_x);