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OMAPDSS: DSI: fix dsi_get_dsidev_from_id() 

If dsi_get_dsidev_from_id() is called with a DSI module id that does not
exist on the board, the function will crash as omap_dss_get_output()
will return NULL.

This happens on omap3 boards when dumping DSI clocks, as the dumping
code will try to get the dsidev for DSI modules 0 and 1, but omap3 only
has DSI module 0.

Also clean up the id -> output mapping, so that if the function is
called with invalid module ID it will return NULL.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Archit Taneja <archit@ti.com>
This commit is contained in:
Tomi Valkeinen 2012-10-15 12:48:11 +03:00
parent ddffeb8c4d
commit ea29c4ea2b
1 changed files with 11 additions and 2 deletions
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13
drivers/video/omap2/dss/dsi.c
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@ -365,11 +365,20 @@ struct platform_device *dsi_get_dsidev_from_id(int module)
struct omap_dss_output *out;
enum omap_dss_output_id id;
id = module == 0 ? OMAP_DSS_OUTPUT_DSI1 : OMAP_DSS_OUTPUT_DSI2;
switch (module) {
case 0:
id = OMAP_DSS_OUTPUT_DSI1;
break;
case 1:
id = OMAP_DSS_OUTPUT_DSI2;
break;
default:
return NULL;
}
out = omap_dss_get_output(id);
return out->pdev;
return out ? out->pdev : NULL;
}
static inline void dsi_write_reg(struct platform_device *dsidev,