diff options
| -rw-r--r-- | doc/README.video | 19 | ||||
| -rw-r--r-- | drivers/video/videomodes.c | 64 | ||||
| -rw-r--r-- | drivers/video/videomodes.h | 3 |
3 files changed, 86 insertions, 0 deletions
diff --git a/doc/README.video b/doc/README.video index 34e199c2d2..0c04bea571 100644 --- a/doc/README.video +++ b/doc/README.video @@ -28,3 +28,22 @@ The driver has been tested with the following configurations: - MPC823FADS with AD7176 on a PAL TV (YCbYCr) - arsenio@tin.it - GENIETV with AD7177 on a PAL TV (YCbYCr) - arsenio@tin.it + + +"video-mode" environment variable +=============================== + +The 'video-mode' environment variable can be used to enable and configure +some video drivers. The format matches the video= command-line option used +for Linux: + + video-mode=<driver>:<xres>x<yres>-<depth>@<freq><,option=string> + + <driver> The video driver name, ignored by U-Boot + <xres> The X resolution (in pixels) to use. + <yres> The Y resolution (in pixels) to use. + <depth> The color depth (in bits) to use. + <freq> The frequency (in Hz) to use. + <options> A comma-separated list of device-specific options + +Example: video-mode=fslfb:1280x1024-32@60,monitor=dvi diff --git a/drivers/video/videomodes.c b/drivers/video/videomodes.c index d27ce1d2cd..6fe5811aec 100644 --- a/drivers/video/videomodes.c +++ b/drivers/video/videomodes.c @@ -1,6 +1,7 @@ /* * (C) Copyright 2004 * Pierre Aubert, Staubli Faverges , <p.aubert@staubli.com> + * Copyright 2011 Freescale Semiconductor, Inc. * * See file CREDITS for list of people who contributed to this * project. @@ -73,6 +74,8 @@ ****************************************************************************/ #include <common.h> +#include <linux/ctype.h> + #include "videomodes.h" const struct ctfb_vesa_modes vesa_modes[VESA_MODES_COUNT] = { @@ -206,3 +209,64 @@ int video_get_params (struct ctfb_res_modes *pPar, char *penv) } return bpp; } + +/* + * Parse the 'video-mode' environment variable + * + * Example: "video-mode=fslfb:1280x1024-32@60,monitor=dvi". See + * doc/README.video for more information on how to set the variable. + * + * @xres: returned value of X-resolution + * @yres: returned value of Y-resolution + * @depth: returned value of color depth + * @freq: returned value of monitor frequency + * @options: pointer to any remaining options, or NULL + * + * Returns 1 if valid values were found, 0 otherwise + */ +int video_get_video_mode(unsigned int *xres, unsigned int *yres, + unsigned int *depth, unsigned int *freq, const char **options) +{ + char *p = getenv("video-mode"); + if (!p) + return 0; + + /* Skip over the driver name, which we don't care about. */ + p = strchr(p, ':'); + if (!p) + return 0; + + /* Get the X-resolution*/ + while (*p && !isdigit(*p)) + p++; + *xres = simple_strtoul(p, &p, 10); + if (!*xres) + return 0; + + /* Get the Y-resolution */ + while (*p && !isdigit(*p)) + p++; + *yres = simple_strtoul(p, &p, 10); + if (!*yres) + return 0; + + /* Get the depth */ + while (*p && !isdigit(*p)) + p++; + *depth = simple_strtoul(p, &p, 10); + if (!*depth) + return 0; + + /* Get the frequency */ + while (*p && !isdigit(*p)) + p++; + *freq = simple_strtoul(p, &p, 10); + if (!*freq) + return 0; + + /* Find the extra options, if any */ + p = strchr(p, ','); + *options = p ? p + 1 : NULL; + + return 1; +} diff --git a/drivers/video/videomodes.h b/drivers/video/videomodes.h index 0d7c335410..e546ab44f1 100644 --- a/drivers/video/videomodes.h +++ b/drivers/video/videomodes.h @@ -86,3 +86,6 @@ extern const struct ctfb_vesa_modes vesa_modes[]; extern const struct ctfb_res_modes res_mode_init[]; 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); |