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videomodes: Add video_get_ctfb_res_modes helper function

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Add a video_get_ctfb_res_modes() helper function, which uses
video_get_video_mode() to parse the 'video-mode' environment variable and then
looks up the matching mode in res_mode_init and returns the matching mode.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Hans de Goede 2014-12-19 13:22:47 +01:00
parent 59bb610922
commit e976b868f2
2 changed files with 45 additions and 0 deletions
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40
drivers/video/videomodes.c
View file

@ -275,3 +275,43 @@ int video_get_video_mode(unsigned int *xres, unsigned int *yres,
return 1;
}
/*
* Parse the 'video-mode' environment variable using video_get_video_mode()
* and lookup the matching ctfb_res_modes in res_mode_init.
*
* @default_mode: RES_MODE_##x## define for the mode to store in mode_ret
* when 'video-mode' is not set or does not contain a valid mode
* @default_depth: depth to set when 'video-mode' is not set
* @mode_ret: pointer where the mode will be stored
* @depth_ret: pointer where the depth will be stored
* @options: pointer to any remaining options, or NULL
*/
void video_get_ctfb_res_modes(int default_mode, unsigned int default_depth,
const struct ctfb_res_modes **mode_ret,
unsigned int *depth_ret,
const char **options)
{
unsigned int i, xres, yres, depth, refresh;
*mode_ret = &res_mode_init[default_mode];
*depth_ret = default_depth;
*options = NULL;
if (!video_get_video_mode(&xres, &yres, &depth, &refresh, options))
return;
for (i = 0; i < RES_MODES_COUNT; i++) {
if (res_mode_init[i].xres == xres &&
res_mode_init[i].yres == yres &&
res_mode_init[i].refresh == refresh) {
*mode_ret = &res_mode_init[i];
*depth_ret = depth;
return;
}
}
printf("video-mode %dx%d-%d@%d not available, falling back to %dx%d-%d@%d\n",
xres, yres, depth, refresh, (*mode_ret)->xres,
(*mode_ret)->yres, *depth_ret, (*mode_ret)->refresh);
}

5
drivers/video/videomodes.h
View file

@ -79,3 +79,8 @@ int video_get_params (struct ctfb_res_modes *pPar, char *penv);
int video_get_video_mode(unsigned int *xres, unsigned int *yres,
unsigned int *depth, unsigned int *freq, const char **options);
void video_get_ctfb_res_modes(int default_mode, unsigned int default_depth,
const struct ctfb_res_modes **mode_ret,
unsigned int *depth_ret,
const char **options);