drm/sti: do not set gdp pixel clock rate if mode is not set

Fix a division by 0 case : in some cases, when the GDP plane is being
disabled atomic_check() is called with "mode->clock = 0".
In that case, do not set parent and pixel clock rate.

Signed-off-by: Vincent Abriou <vincent.abriou@st.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/drm/sti/sti_gdp.c b/drivers/gpu/drm/sti/sti_gdp.c
index 7255234670c0..7f6d0790cca6 100644
--- a/drivers/gpu/drm/sti/sti_gdp.c
+++ b/drivers/gpu/drm/sti/sti_gdp.c
@@ -648,7 +648,7 @@ static int sti_gdp_atomic_check(struct drm_plane *drm_plane,
         }
 
         /* Set gdp clock */
-        if (gdp->clk_pix) {
+        if (mode->clock && gdp->clk_pix) {
                 struct clk *clkp;
                 int rate = mode->clock * 1000;
                 int res;