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OMAPFB: find best mode from edid

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Use the new read_edid() function to get EDID information from the
display (when available), and use the information to use a suitable mode
at initialization time.

Hot-plug is not yet supported, so the timings selected at init time will
stay even if the monitor would be changed.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2011-08-25 17:15:14 +03:00
parent fcca719430
commit dc891fab11
1 changed files with 99 additions and 10 deletions
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109
drivers/video/omap2/omapfb/omapfb-main.c
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@ -2276,6 +2276,87 @@ static int omapfb_parse_def_modes(struct omapfb2_device *fbdev)
return r;
}
static void fb_videomode_to_omap_timings(struct fb_videomode *m,
struct omap_video_timings *t)
{
t->x_res = m->xres;
t->y_res = m->yres;
t->pixel_clock = PICOS2KHZ(m->pixclock);
t->hsw = m->hsync_len;
t->hfp = m->right_margin;
t->hbp = m->left_margin;
t->vsw = m->vsync_len;
t->vfp = m->lower_margin;
t->vbp = m->upper_margin;
}
static int omapfb_find_best_mode(struct omap_dss_device *display,
struct omap_video_timings *timings)
{
struct fb_monspecs *specs;
u8 *edid;
int r, i, best_xres, best_idx, len;
if (!display->driver->read_edid)
return -ENODEV;
len = 0x80 * 2;
edid = kmalloc(len, GFP_KERNEL);
r = display->driver->read_edid(display, edid, len);
if (r < 0)
goto err1;
specs = kzalloc(sizeof(*specs), GFP_KERNEL);
fb_edid_to_monspecs(edid, specs);
if (edid[126] > 0)
fb_edid_add_monspecs(edid + 0x80, specs);
best_xres = 0;
best_idx = -1;
for (i = 0; i < specs->modedb_len; ++i) {
struct fb_videomode *m;
struct omap_video_timings t;
m = &specs->modedb[i];
if (m->pixclock == 0)
continue;
/* skip repeated pixel modes */
if (m->xres == 2880 || m->xres == 1440)
continue;
fb_videomode_to_omap_timings(m, &t);
r = display->driver->check_timings(display, &t);
if (r == 0 && best_xres < m->xres) {
best_xres = m->xres;
best_idx = i;
}
}
if (best_xres == 0) {
r = -ENOENT;
goto err2;
}
fb_videomode_to_omap_timings(&specs->modedb[best_idx], timings);
r = 0;
err2:
fb_destroy_modedb(specs->modedb);
kfree(specs);
err1:
kfree(edid);
return r;
}
static int omapfb_init_display(struct omapfb2_device *fbdev,
struct omap_dss_device *dssdev)
{
@ -2404,9 +2485,27 @@ static int omapfb_probe(struct platform_device *pdev)
for (i = 0; i < fbdev->num_managers; i++)
fbdev->managers[i] = omap_dss_get_overlay_manager(i);
/* gfx overlay should be the default one. find a display
* connected to that, and use it as default display */
ovl = omap_dss_get_overlay(0);
if (ovl->manager && ovl->manager->device) {
def_display = ovl->manager->device;
} else {
dev_warn(&pdev->dev, "cannot find default display\n");
def_display = NULL;
}
if (def_mode && strlen(def_mode) > 0) {
if (omapfb_parse_def_modes(fbdev))
dev_warn(&pdev->dev, "cannot parse default modes\n");
} else if (def_display && def_display->driver->set_timings &&
def_display->driver->check_timings) {
struct omap_video_timings t;
r = omapfb_find_best_mode(def_display, &t);
if (r == 0)
def_display->driver->set_timings(def_display, &t);
}
r = omapfb_create_framebuffers(fbdev);
@ -2423,16 +2522,6 @@ static int omapfb_probe(struct platform_device *pdev)
DBG("mgr->apply'ed\n");
/* gfx overlay should be the default one. find a display
* connected to that, and use it as default display */
ovl = omap_dss_get_overlay(0);
if (ovl->manager && ovl->manager->device) {
def_display = ovl->manager->device;
} else {
dev_warn(&pdev->dev, "cannot find default display\n");
def_display = NULL;
}
if (def_display) {
r = omapfb_init_display(fbdev, def_display);
if (r) {