Add helper to get fb_videomode from devicetree.
Signed-off-by: Steffen Trumtrar s.trumtrar@pengutronix.de --- drivers/video/fbmon.c | 40 ++++++++++++++++++++++++++++++++++++++++ include/linux/fb.h | 3 +++ 2 files changed, 43 insertions(+)
diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c index b9e6ab3..871aa76 100644 --- a/drivers/video/fbmon.c +++ b/drivers/video/fbmon.c @@ -1408,6 +1408,46 @@ int videomode_to_fb_videomode(struct videomode *vm, struct fb_videomode *fbmode) EXPORT_SYMBOL_GPL(videomode_to_fb_videomode); #endif
+#if IS_ENABLED(CONFIG_OF_VIDEOMODE) +static void dump_fb_videomode(struct fb_videomode *m) +{ + pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n", + m->xres, m->yres, m->refresh, m->pixclock, m->left_margin, + m->right_margin, m->upper_margin, m->lower_margin, + m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag); +} + +/** + * of_get_fb_videomode - get a fb_videomode from devicetree + * @np: device_node with the timing specification + * @fb: will be set to the return value + * @index: index into the list of display timings in devicetree + * + * DESCRIPTION: + * This function is expensive and should only be used, if only one mode is to be + * read from DT. To get multiple modes start with of_get_display_timing_list ond + * work with that instead. + */ +int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb, + int index) +{ + struct videomode vm; + int ret; + + ret = of_get_videomode(np, &vm, index); + if (ret) + return ret; + + videomode_to_fb_videomode(&vm, fb); + + pr_info("%s: got %dx%d display mode from %s\n", __func__, vm.hactive, + vm.vactive, np->name); + dump_fb_videomode(fb); + + return 0; +} +EXPORT_SYMBOL_GPL(of_get_fb_videomode); +#endif
#else int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) diff --git a/include/linux/fb.h b/include/linux/fb.h index 46c665b..9892fd6 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -14,6 +14,8 @@ #include <linux/backlight.h> #include <linux/slab.h> #include <asm/io.h> +#include <linux/of.h> +#include <linux/of_videomode.h>
struct vm_area_struct; struct fb_info; @@ -714,6 +716,7 @@ extern void fb_destroy_modedb(struct fb_videomode *modedb); extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb); extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
+extern int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb, int index); extern int videomode_to_fb_videomode(struct videomode *vm, struct fb_videomode *fbmode);
/* drivers/video/modedb.c */