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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2011-01-07 11:57:55 +0000
committerPaul Mundt <lethal@linux-sh.org>2011-01-11 12:07:49 +0900
commitc7321d6f88e1f962d605923a93f9c255e4d0b8c9 (patch)
tree41d541c751f976b1fecec8f2d7f59751d84bb7b6 /drivers/video/sh_mobile_hdmi.c
parente9ab3207310e8acfa3a5cd8cbb44860f69270bfd (diff)
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fbdev: sh_mobile_hdmi: add command line option to use the preferred EDID mode
Currently, if no command-line option is specified, the sh_mobile_hdmi will use the default 720p video mode. If a command line option of the form "video=sh_mobile_lcdc:<width>x<height>@<refresh>" is provided, the driver will look for that mode among those, available in the monitor EDID. This patch adds the ability to request the driver to use monitor's preferred mode by specifying 0 as width and hight in the above string. If that mode is not supported by the system, the driver will continue scanning through EDID modes, until it finds a suitable one. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/video/sh_mobile_hdmi.c')
-rw-r--r--drivers/video/sh_mobile_hdmi.c60
1 files changed, 41 insertions, 19 deletions
diff --git a/drivers/video/sh_mobile_hdmi.c b/drivers/video/sh_mobile_hdmi.c
index 8c59cc8..571bd9f 100644
--- a/drivers/video/sh_mobile_hdmi.c
+++ b/drivers/video/sh_mobile_hdmi.c
@@ -737,7 +737,7 @@ static int sh_hdmi_read_edid(struct sh_hdmi *hdmi, unsigned long *hdmi_rate,
struct fb_modelist *modelist = NULL;
unsigned int f_width = 0, f_height = 0, f_refresh = 0;
unsigned long found_rate_error = ULONG_MAX; /* silly compiler... */
- bool exact_match = false;
+ bool scanning = false, preferred_bad = false;
u8 edid[128];
char *forced;
int i;
@@ -800,6 +800,9 @@ static int sh_hdmi_read_edid(struct sh_hdmi *hdmi, unsigned long *hdmi_rate,
if (i < 2) {
f_width = 0;
f_height = 0;
+ } else {
+ /* The user wants us to use the EDID data */
+ scanning = true;
}
dev_dbg(hdmi->dev, "Forced mode %ux%u@%uHz\n",
f_width, f_height, f_refresh);
@@ -807,37 +810,56 @@ static int sh_hdmi_read_edid(struct sh_hdmi *hdmi, unsigned long *hdmi_rate,
/* Walk monitor modes to find the best or the exact match */
for (i = 0, mode = hdmi->monspec.modedb;
- f_width && f_height && i < hdmi->monspec.modedb_len && !exact_match;
+ i < hdmi->monspec.modedb_len && scanning;
i++, mode++) {
unsigned long rate_error;
- /* No interest in unmatching modes */
- if (f_width != mode->xres || f_height != mode->yres)
+ if (!f_width && !f_height) {
+ /*
+ * A parameter string "video=sh_mobile_lcdc:0x0" means
+ * use the preferred EDID mode. If it is rejected by
+ * .fb_check_var(), keep looking, until an acceptable
+ * one is found.
+ */
+ if ((mode->flag & FB_MODE_IS_FIRST) || preferred_bad)
+ scanning = false;
+ else
+ continue;
+ } else if (f_width != mode->xres || f_height != mode->yres) {
+ /* No interest in unmatching modes */
continue;
+ }
rate_error = sh_hdmi_rate_error(hdmi, mode, hdmi_rate, parent_rate);
- if (f_refresh == mode->refresh || (!f_refresh && !rate_error))
- /*
- * Exact match if either the refresh rate matches or it
- * hasn't been specified and we've found a mode, for
- * which we can configure the clock precisely
- */
- exact_match = true;
- else if (found && found_rate_error <= rate_error)
- /*
- * We otherwise search for the closest matching clock
- * rate - either if no refresh rate has been specified
- * or we cannot find an exactly matching one
- */
- continue;
+ if (scanning) {
+ if (f_refresh == mode->refresh || (!f_refresh && !rate_error))
+ /*
+ * Exact match if either the refresh rate
+ * matches or it hasn't been specified and we've
+ * found a mode, for which we can configure the
+ * clock precisely
+ */
+ scanning = false;
+ else if (found && found_rate_error <= rate_error)
+ /*
+ * We otherwise search for the closest matching
+ * clock rate - either if no refresh rate has
+ * been specified or we cannot find an exactly
+ * matching one
+ */
+ continue;
+ }
/* Check if supported: sufficient fb memory, supported clock-rate */
fb_videomode_to_var(var, mode);
+ var->bits_per_pixel = info->var.bits_per_pixel;
+
if (info && info->fbops->fb_check_var &&
info->fbops->fb_check_var(var, info)) {
- exact_match = false;
+ scanning = true;
+ preferred_bad = true;
continue;
}