drm/exynos/mixer: correct vsync configuration sequence

Specification advises to clear vsync indicator before configuring vsync.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 25f0aac..923aa75 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -906,8 +906,8 @@ static int mixer_enable_vblank(struct exynos_drm_crtc *crtc)
        }
 
        /* enable vsync interrupt */
-       mixer_reg_writemask(res, MXR_INT_EN, MXR_INT_EN_VSYNC,
-                       MXR_INT_EN_VSYNC);
+       mixer_reg_writemask(res, MXR_INT_STATUS, ~0, MXR_INT_CLEAR_VSYNC);
+       mixer_reg_writemask(res, MXR_INT_EN, ~0, MXR_INT_EN_VSYNC);
 
        return 0;
 }
@@ -918,6 +918,7 @@ static void mixer_disable_vblank(struct exynos_drm_crtc *crtc)
        struct mixer_resources *res = &mixer_ctx->mixer_res;
 
        /* disable vsync interrupt */
+       mixer_reg_writemask(res, MXR_INT_STATUS, ~0, MXR_INT_CLEAR_VSYNC);
        mixer_reg_writemask(res, MXR_INT_EN, 0, MXR_INT_EN_VSYNC);
 }
 
@@ -1046,6 +1047,8 @@ static void mixer_enable(struct exynos_drm_crtc *crtc)
 
        mixer_reg_writemask(res, MXR_STATUS, ~0, MXR_STATUS_SOFT_RESET);
 
+       if (ctx->int_en & MXR_INT_EN_VSYNC)
+               mixer_reg_writemask(res, MXR_INT_STATUS, ~0, MXR_INT_CLEAR_VSYNC);
        mixer_reg_write(res, MXR_INT_EN, ctx->int_en);
        mixer_win_reset(ctx);
 }