Add helper to get fb_videomode from devicetree.
Signed-off-by: Steffen Trumtrar s.trumtrar@pengutronix.de --- drivers/video/fbmon.c | 42 +++++++++++++++++++++++++++++++++++++++++- include/linux/fb.h | 6 ++++++ 2 files changed, 47 insertions(+), 1 deletion(-)
diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c index 247e079..9e8c5fa 100644 --- a/drivers/video/fbmon.c +++ b/drivers/video/fbmon.c @@ -31,7 +31,7 @@ #include <linux/pci.h> #include <linux/slab.h> #include <video/edid.h> -#include <linux/videomode.h> +#include <linux/of_videomode.h> #ifdef CONFIG_PPC_OF #include <asm/prom.h> #include <asm/pci-bridge.h> @@ -1418,6 +1418,46 @@ int fb_videomode_from_videomode(struct videomode *vm, EXPORT_SYMBOL_GPL(fb_videomode_from_videomode); #endif
+#if IS_ENABLED(CONFIG_OF_VIDEOMODE) +static inline 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_timings ond + * work with that instead. + */ +int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb, + unsigned int index) +{ + struct videomode vm; + int ret; + + ret = of_get_videomode(np, &vm, index); + if (ret) + return ret; + + fb_videomode_from_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 4024136..dc8f693 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -15,6 +15,8 @@ #include <linux/slab.h> #include <asm/io.h> #include <linux/videomode.h> +#include <linux/of.h> +#include <linux/of_videomode.h>
struct vm_area_struct; struct fb_info; @@ -715,6 +717,10 @@ 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);
+#if IS_ENABLED(CONFIG_OF_VIDEOMODE) +extern int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb, + unsigned int index); +#endif #if IS_ENABLED(CONFIG_VIDEOMODE) extern int fb_videomode_from_videomode(struct videomode *vm, struct fb_videomode *fbmode);