drm/exynos: restore core HDMI settings

In DVI mode the video preamble and Guard band should
be disabled whereas it should be applied in HDMI mode,
the re-applying of preamble and guard band was missing,
which resulted in display failures when switched to HDMI
mode from DVI mode.
This patch ensures the setting is applied in HDMI mode.

Signed-off-by: Shirish S <s.shirish@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 6acc1e358d56..b03e721270aa 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -1354,6 +1354,8 @@ static void hdmi_conf_init(struct hdmi_context *hdata)
         /* choose HDMI mode */
         hdmi_reg_writemask(hdata, HDMI_MODE_SEL,
                 HDMI_MODE_HDMI_EN, HDMI_MODE_MASK);
+        /* Apply Video preable and Guard band in HDMI mode only */
+        hdmi_reg_writeb(hdata, HDMI_CON_2, 0);
         /* disable bluescreen */
         hdmi_reg_writemask(hdata, HDMI_CON_0, 0, HDMI_BLUE_SCR_EN);