sh: skip disabled LCDC channels

This patch updates the SuperH Mobile LCDC driver to skip
over disabled channels. Without this patch suspend-to-ram
operation will crash if deferred io is enabled.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/video/sh_mobile_lcdcfb.c b/drivers/video/sh_mobile_lcdcfb.c
index 8f24564f77b0..07f22b625632 100644
--- a/drivers/video/sh_mobile_lcdcfb.c
+++ b/drivers/video/sh_mobile_lcdcfb.c
@@ -481,6 +481,9 @@ static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
         /* tell the board code to enable the panel */
         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
                 ch = &priv->ch[k];
+                if (!ch->enabled)
+                        continue;
+
                 board_cfg = &ch->cfg.board_cfg;
                 if (board_cfg->display_on)
                         board_cfg->display_on(board_cfg->board_data);
@@ -498,6 +501,8 @@ static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
         /* clean up deferred io and ask board code to disable panel */
         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
                 ch = &priv->ch[k];
+                if (!ch->enabled)
+                        continue;
 
                 /* deferred io mode:
                  * flush frame, and wait for frame end interrupt