drm/exynos: fix to calculate CRTC shown via screen (2ab97921) · Commits · 戴 / test

drivers/gpu/drm/exynos/exynos_drm_plane.c

+54 −2

Original line number	Diff line number	Diff line
		@@ -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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