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OMAP: DSS2: DSS: Fix context save/restore 

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 <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2011-06-01 15:56:39 +03:00
parent 49ea86f3fa
commit 69f06054aa
1 changed files with 10 additions and 0 deletions
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10
drivers/video/omap2/dss/dss.c
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@ -74,6 +74,7 @@ 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;
@ -109,12 +110,19 @@ 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) &
@ -122,6 +130,8 @@ static void dss_restore_context(void)
RR(SDI_CONTROL);
RR(PLL_CONTROL);
}
DSSDBG("context restored\n");
}
#undef SR