video: stop sh_mobile_lcdcfb only if started

This patch fixes the LCDC driver to avoid calling the
function sh_mobile_lcdc_start_stop(priv, 0) unless the
same function has been called before to start the LCDC
hardware.

Triggered when sh_mobile_lcdcfb.c failed to probe() due to
missing MSTP clocks.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/video/sh_mobile_lcdcfb.c b/drivers/video/sh_mobile_lcdcfb.c
index 92ea0ab44ce2..f10d2fbeda06 100644
--- a/drivers/video/sh_mobile_lcdcfb.c
+++ b/drivers/video/sh_mobile_lcdcfb.c
@@ -47,6 +47,7 @@ struct sh_mobile_lcdc_priv {
 #endif
         unsigned long lddckr;
         struct sh_mobile_lcdc_chan ch[2];
+        int started;
 };
 
 /* shared registers */
@@ -451,6 +452,7 @@ static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
 
         /* start the lcdc */
         sh_mobile_lcdc_start_stop(priv, 1);
+        priv->started = 1;
 
         /* tell the board code to enable the panel */
         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
@@ -493,7 +495,10 @@ static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
         }
 
         /* stop the lcdc */
-        sh_mobile_lcdc_start_stop(priv, 0);
+        if (priv->started) {
+                sh_mobile_lcdc_start_stop(priv, 0);
+                priv->started = 0;
+        }
 
         /* stop clocks */
         for (k = 0; k < ARRAY_SIZE(priv->ch); k++)