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amba-clcd: set video mode via module parameter on kernel commandline

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Specifying the module parameter "amba-clcd.mode=<mode>" will over-ride
the default mode used when the driver is initialised.

Where <mode> can either be VGA or XVGA (the default).

Signed-off-by: Ryan Harkin <ryan.harkin@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Ryan Harkin
2014-04-16 18:08:01 +01:00
committed by Mark Brown
parent 936b996b71
commit 6846e7822c
1 changed files with 13 additions and 3 deletions
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16
drivers/video/amba-clcd.c
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@@ -45,6 +45,8 @@
/* This is limited to 16 characters when displayed by X startup */
static const char *clcd_name = "CLCD FB";
static char *def_mode;
module_param_named(mode, def_mode, charp, 0);
/*
* Unfortunately, the enable/disable functions may be called either from
@@ -763,10 +765,18 @@ static int clcdfb_dt_init(struct clcd_fb *fb)
na = of_n_addr_cells(node);
ns = of_n_size_cells(node);
if (WARN_ON(of_property_read_string(node, "mode", &mode)))
return -ENODEV;
if (def_mode && strlen(def_mode) > 0) {
fb->panel = clcdfb_get_panel(def_mode);
if (!fb->panel)
printk(KERN_ERR "CLCD: invalid mode specified on the command line (%s)\n", def_mode);
}
if (!fb->panel) {
if (WARN_ON(of_property_read_string(node, "mode", &mode)))
return -ENODEV;
fb->panel = clcdfb_get_panel(mode);
}
fb->panel = clcdfb_get_panel(mode);
if (!fb->panel)
return -EINVAL;
fb->fb.fix.smem_len = fb->panel->mode.xres * fb->panel->mode.yres * 2;