Re: [PATCHv13 5/7] fbmon: add of_videomode helpers
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: 2012-11-22 17:58:09
Also in:
dri-devel, linux-devicetree, linux-media
Hi Steffen, On Thursday 22 November 2012 17:00:13 Steffen Trumtrar wrote:
Add helper to get fb_videomode from devicetree. Signed-off-by: Steffen Trumtrar <redacted> Reviewed-by: Thierry Reding <redacted> Acked-by: Thierry Reding <redacted> Tested-by: Thierry Reding <redacted> Tested-by: Philipp Zabel <p.zabel@pengutronix.de> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This patch results in the following build warning: drivers/video/fbmon.c: In function 'of_get_fb_videomode': drivers/video/fbmon.c:1445: warning: passing argument 1 of 'of_get_videomode' discards qualifiers from pointer target type include/linux/of_videomode.h:15: note: expected 'struct device_node *' but argument is of type 'const struct device_node *'
quoted hunk
--- 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 a6a564d..cd0a035 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>@@ -1416,6 +1416,46 @@ int fb_videomode_from_videomode(const structvideomode *vm, EXPORT_SYMBOL_GPL(fb_videomode_from_videomode); #endif +#if IS_ENABLED(CONFIG_OF_VIDEOMODE) +static inline void dump_fb_videomode(const struct fb_videomode *m) +{ + pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u
%u\n",
quoted hunk
+ 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(const 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 4404ec2..43a2f81 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h@@ -20,6 +20,7 @@ struct fb_info; struct device; struct file; struct videomode; +struct device_node; /* Definitions below are used in the parsed monitor specs */ #define FB_DPMS_ACTIVE_OFF 1@@ -715,6 +716,11 @@ 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(const struct device_node *np, + struct fb_videomode *fb, + unsigned int index); +#endif #if IS_ENABLED(CONFIG_VIDEOMODE) extern int fb_videomode_from_videomode(const struct videomode *vm, struct fb_videomode *fbmode);
-- Regards, Laurent Pinchart