[PATCH] drm/exynos: fix to calculate CRTC shown via screen
Joonyoung Shim
jy0922.shim at samsung.com
Thu Sep 27 03:25:21 PDT 2012
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: Joonyoung Shim <jy0922.shim at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
drivers/gpu/drm/exynos/exynos_drm_plane.c | 56 +++++++++++++++++++++++++++--
1 file changed, 54 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c
index 777e142..4a03d1c 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_plane.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c
@@ -33,6 +33,42 @@ 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,
@@ -65,8 +101,24 @@ 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;
--
1.7.9.5
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