OMAP: DSS2: Check for SDI HW before accessing SDI registers

Only OMAP 3430 hardware has SDI support. The availability of SDI HW can
be found out by checking if the LCD channel supports SDI displays.

This patch checks for SDI HW support before accessing SDI registers,
which fixes a crash on OMAP4 when SDI SW support is compiled in.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c
index dc57100cc43dc407a145b42f735ebba29d70a673..50c18677684d3943e6b6ef90211a96f0012216ca 100644 (file)
--- a/drivers/video/omap2/dss/dss.c
+++ b/drivers/video/omap2/dss/dss.c
@@ -32,6 +32,7 @@
 #include <plat/display.h>
 #include <plat/clock.h>
 #include "dss.h"
+#include "dss_features.h"
 
 #define DSS_SZ_REGS                    SZ_512
 
@@ -110,10 +111,11 @@ void dss_save_context(void)
        SR(SYSCONFIG);
        SR(CONTROL);
 
-#ifdef CONFIG_OMAP2_DSS_SDI
-       SR(SDI_CONTROL);
-       SR(PLL_CONTROL);
-#endif
+       if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
+                       OMAP_DISPLAY_TYPE_SDI) {
+               SR(SDI_CONTROL);
+               SR(PLL_CONTROL);
+       }
 }
 
 void dss_restore_context(void)
@@ -124,10 +126,11 @@ void dss_restore_context(void)
        RR(SYSCONFIG);
        RR(CONTROL);
 
-#ifdef CONFIG_OMAP2_DSS_SDI
-       RR(SDI_CONTROL);
-       RR(PLL_CONTROL);
-#endif
+       if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
+                       OMAP_DISPLAY_TYPE_SDI) {
+               RR(SDI_CONTROL);
+               RR(PLL_CONTROL);
+       }
 }
 
 #undef SR
@@ -259,9 +262,13 @@ void dss_dump_regs(struct seq_file *s)
        DUMPREG(DSS_SYSSTATUS);
        DUMPREG(DSS_IRQSTATUS);
        DUMPREG(DSS_CONTROL);
-       DUMPREG(DSS_SDI_CONTROL);
-       DUMPREG(DSS_PLL_CONTROL);
-       DUMPREG(DSS_SDI_STATUS);
+
+       if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
+                       OMAP_DISPLAY_TYPE_SDI) {
+               DUMPREG(DSS_SDI_CONTROL);
+               DUMPREG(DSS_PLL_CONTROL);
+               DUMPREG(DSS_SDI_STATUS);
+       }
 
        dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
 #undef DUMPREG