Commit 2ab97921 authored by Joonyoung Shim's avatar Joonyoung Shim Committed by Inki Dae
Browse files

drm/exynos: fix to calculate CRTC shown via screen



This patch is to exactly calculate CRTC shown via screen for all cases.
Refer exynos_plane_get_size() function for this. Also source position of
fb is fixed when start position of CRTC is negative number.
Signed-off-by: default avatarJoonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
parent 58f6aad7
......@@ -32,6 +32,42 @@ static const uint32_t formats[] = {
DRM_FORMAT_NV12MT,
};
/*
* This function is to get X or Y size shown via screen. This needs length and
* start position of CRTC.
*
* <--- length --->
* CRTC ----------------
* ^ start ^ end
*
* There are six cases from a to b.
*
* <----- SCREEN ----->
* 0 last
* ----------|------------------|----------
* CRTCs
* a -------
* b -------
* c --------------------------
* d --------
* e -------
* f -------
*/
static int exynos_plane_get_size(int start, unsigned length, unsigned last)
{
int end = start + length;
int size = 0;
if (start <= 0) {
if (end > 0)
size = min_t(unsigned, end, last);
} else if (start <= last) {
size = min_t(unsigned, last - start, length);
}
return size;
}
int exynos_plane_mode_set(struct drm_plane *plane, struct drm_crtc *crtc,
struct drm_framebuffer *fb, int crtc_x, int crtc_y,
unsigned int crtc_w, unsigned int crtc_h,
......@@ -64,8 +100,24 @@ int exynos_plane_mode_set(struct drm_plane *plane, struct drm_crtc *crtc,
(unsigned long)overlay->dma_addr[i]);
}
actual_w = min((unsigned)(crtc->mode.hdisplay - crtc_x), crtc_w);
actual_h = min((unsigned)(crtc->mode.vdisplay - crtc_y), crtc_h);
actual_w = exynos_plane_get_size(crtc_x, crtc_w, crtc->mode.hdisplay);
actual_h = exynos_plane_get_size(crtc_y, crtc_h, crtc->mode.vdisplay);
if (crtc_x < 0) {
if (actual_w)
src_x -= crtc_x;
else
src_x += crtc_w;
crtc_x = 0;
}
if (crtc_y < 0) {
if (actual_h)
src_y -= crtc_y;
else
src_y += crtc_h;
crtc_y = 0;
}
/* set drm framebuffer data. */
overlay->fb_x = src_x;
......
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