drm/exynos: correct timing porch conversion

The patch corrects porch calculation. It should
be calculated as a difference between adjacent
respective fields of drm_display_mode.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 5 insertions, 7 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index f78fbf4682b4..10431b0a35ba 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -221,7 +221,7 @@ static void fimd_commit(struct exynos_drm_manager *mgr)
         struct drm_display_mode *mode = &ctx->mode;
         struct fimd_driver_data *driver_data;
         u32 val, clkdiv, vidcon1;
-        int hblank, vblank, vsync_len, vbpd, vfpd, hsync_len, hbpd, hfpd;
+        int vsync_len, vbpd, vfpd, hsync_len, hbpd, hfpd;
 
         driver_data = ctx->driver_data;
         if (ctx->suspended)
@@ -240,10 +240,9 @@ static void fimd_commit(struct exynos_drm_manager *mgr)
         writel(vidcon1, ctx->regs + driver_data->timing_base + VIDCON1);
 
         /* setup vertical timing values. */
-        vblank = mode->crtc_vblank_end - mode->crtc_vblank_start;
         vsync_len = mode->crtc_vsync_end - mode->crtc_vsync_start;
-        vbpd = (vblank - vsync_len) / 2;
-        vfpd = vblank - vsync_len - vbpd;
+        vbpd = mode->crtc_vtotal - mode->crtc_vsync_end;
+        vfpd = mode->crtc_vsync_start - mode->crtc_vdisplay;
 
         val = VIDTCON0_VBPD(vbpd - 1) |
                 VIDTCON0_VFPD(vfpd - 1) |
@@ -251,10 +250,9 @@ static void fimd_commit(struct exynos_drm_manager *mgr)
         writel(val, ctx->regs + driver_data->timing_base + VIDTCON0);
 
         /* setup horizontal timing values.  */
-        hblank = mode->crtc_hblank_end - mode->crtc_hblank_start;
         hsync_len = mode->crtc_hsync_end - mode->crtc_hsync_start;
-        hbpd = (hblank - hsync_len) / 2;
-        hfpd = hblank - hsync_len - hbpd;
+        hbpd = mode->crtc_htotal - mode->crtc_hsync_end;
+        hfpd = mode->crtc_hsync_start - mode->crtc_hdisplay;
 
         val = VIDTCON1_HBPD(hbpd - 1) |
                 VIDTCON1_HFPD(hfpd - 1) |