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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>
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1 changed files with 10 additions and 0 deletions
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@ -74,6 +74,7 @@ static struct {
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enum omap_dss_clk_source dispc_clk_source;
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enum omap_dss_clk_source lcd_clk_source[MAX_DSS_LCD_MANAGERS];
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bool ctx_valid;
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u32 ctx[DSS_SZ_REGS / sizeof(u32)];
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} dss;
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@ -109,12 +110,19 @@ static void dss_save_context(void)
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SR(SDI_CONTROL);
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SR(PLL_CONTROL);
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}
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dss.ctx_valid = true;
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DSSDBG("context saved\n");
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}
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static void dss_restore_context(void)
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{
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DSSDBG("dss_restore_context\n");
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if (!dss.ctx_valid)
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return;
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RR(CONTROL);
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if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
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@ -122,6 +130,8 @@ static void dss_restore_context(void)
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RR(SDI_CONTROL);
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RR(PLL_CONTROL);
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}
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DSSDBG("context restored\n");
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}
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#undef SR
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