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videomodes: Add video_get_ctfb_res_modes helper function
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>
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2 changed files with 45 additions and 0 deletions
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@ -275,3 +275,43 @@ int video_get_video_mode(unsigned int *xres, unsigned int *yres,
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return 1;
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}
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/*
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* Parse the 'video-mode' environment variable using video_get_video_mode()
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* and lookup the matching ctfb_res_modes in res_mode_init.
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*
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* @default_mode: RES_MODE_##x## define for the mode to store in mode_ret
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* when 'video-mode' is not set or does not contain a valid mode
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* @default_depth: depth to set when 'video-mode' is not set
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* @mode_ret: pointer where the mode will be stored
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* @depth_ret: pointer where the depth will be stored
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* @options: pointer to any remaining options, or NULL
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*/
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void video_get_ctfb_res_modes(int default_mode, unsigned int default_depth,
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const struct ctfb_res_modes **mode_ret,
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unsigned int *depth_ret,
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const char **options)
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{
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unsigned int i, xres, yres, depth, refresh;
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*mode_ret = &res_mode_init[default_mode];
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*depth_ret = default_depth;
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*options = NULL;
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if (!video_get_video_mode(&xres, &yres, &depth, &refresh, options))
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return;
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for (i = 0; i < RES_MODES_COUNT; i++) {
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if (res_mode_init[i].xres == xres &&
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res_mode_init[i].yres == yres &&
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res_mode_init[i].refresh == refresh) {
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*mode_ret = &res_mode_init[i];
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*depth_ret = depth;
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return;
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}
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}
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printf("video-mode %dx%d-%d@%d not available, falling back to %dx%d-%d@%d\n",
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xres, yres, depth, refresh, (*mode_ret)->xres,
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(*mode_ret)->yres, *depth_ret, (*mode_ret)->refresh);
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}
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@ -79,3 +79,8 @@ int video_get_params (struct ctfb_res_modes *pPar, char *penv);
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int video_get_video_mode(unsigned int *xres, unsigned int *yres,
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unsigned int *depth, unsigned int *freq, const char **options);
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void video_get_ctfb_res_modes(int default_mode, unsigned int default_depth,
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const struct ctfb_res_modes **mode_ret,
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unsigned int *depth_ret,
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const char **options);
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