[27/27] OMAP: DSS2: DSS: Fix context save/restore

Commit Message

Tomi Valkeinen June 3, 2011, 10 a.m. UTC

The current method of saving and restoring the context could cause a
restore before saving, effectively "restoring" zero values to registers.

Add ctx_valid field to indicate if the saved context is valid and can be
restored.

Signed-off-by: Tomi Valkeinen <[e-mail]>
---
 drivers/video/omap2/dss/dss.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

Patch

diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c
index 91572b6..964eb08 100644
--- a/drivers/video/omap2/dss/dss.c
+++ b/drivers/video/omap2/dss/dss.c
@@ -77,6 +77,7 @@  static struct {
 	enum omap_dss_clk_source dispc_clk_source;
 	enum omap_dss_clk_source lcd_clk_source[MAX_DSS_LCD_MANAGERS];
 
+	bool		ctx_valid;
 	u32		ctx[DSS_SZ_REGS / sizeof(u32)];
 } dss;
 
@@ -112,12 +113,19 @@  static void dss_save_context(void)
 		SR(SDI_CONTROL);
 		SR(PLL_CONTROL);
 	}
+
+	dss.ctx_valid = true;
+
+	DSSDBG("context saved\n");
 }
 
 static void dss_restore_context(void)
 {
 	DSSDBG("dss_restore_context\n");
 
+	if (!dss.ctx_valid)
+		return;
+
 	RR(CONTROL);
 
 	if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
@@ -125,6 +133,8 @@  static void dss_restore_context(void)
 		RR(SDI_CONTROL);
 		RR(PLL_CONTROL);
 	}
+
+	DSSDBG("context restored\n");
 }
 
 #undef SR