For the fbdev layer the you have your struct fb_var_screeninfo and also
struct fb_videomode. The struct fb_videomode was developed for the modes
database we have. Struct fb_var_screeninfo is more than just resolution
data which is why we create struct fb_videomode. The really nice thing
is that the conversion from fb_var to fb_videomode always fixes the
pixclock to the proper values so you don't need the pixclock = 0 work
around. I tested this patch with the intelfb driver and had no problem.
I have used it in the past with a KMS enabled tdfx drver I wrote. In the
future this function can be used for fbdev level mode setting. Please try
it out and i hope it can be merged. Thanks.
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 5054970..467ac68 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -581,6 +581,60 @@ int drm_fb_helper_setcolreg(unsigned regno,
}
EXPORT_SYMBOL(drm_fb_helper_setcolreg);
+void drm_display_mode_to_fbmode(struct drm_display_mode *mode,
+ struct fb_videomode *fbmode)
+{
+ fbmode->xres = mode->hdisplay;
+ fbmode->yres = mode->vdisplay;
+ fbmode->right_margin = mode->hsync_start - mode->hdisplay;
+ fbmode->lower_margin = mode->vsync_start - mode->vdisplay;
+ fbmode->hsync_len = mode->hsync_end - mode->hsync_start;
+ fbmode->vsync_len = mode->vsync_end - mode->vsync_start;
+ fbmode->left_margin = mode->htotal - mode->hsync_end;
+ fbmode->upper_margin = mode->vtotal - mode->vsync_end;
+ fbmode->refresh = mode->vrefresh;
+ fbmode->name = mode->name;
+
+ if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+ fbmode->vmode |= FB_VMODE_INTERLACED;
+
+ if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
+ fbmode->vmode |= FB_VMODE_DOUBLE;
+
+ /* Doing a var to fb_videomode always create a proper pixclock
+ * we can trust, but the reverse is not true. So we create
+ * a proper pixclock from the refresh rate wanted. */
+ fbmode->pixclock = mode->vrefresh * mode->vtotal;
+ fbmode->pixclock *= mode->htotal;
+ fbmode->pixclock /= 1000;
+ fbmode->pixclock = KHZ2PICOS(fbmode->pixclock);
+}
+EXPORT_SYMBOL(drm_display_mode_to_fbmode);
+
+void fbmode_to_drm_display_mode(struct fb_videomode *fbmode,
+ struct drm_display_mode *mode)
+{
+ mode->hdisplay = fbmode->xres;
+ mode->vdisplay = fbmode->yres;
+ mode->hsync_start = mode->hdisplay + fbmode->right_margin;
+ mode->vsync_start = mode->vdisplay + fbmode->lower_margin;
+ mode->hsync_end = mode->hsync_start + fbmode->hsync_len;
+ mode->vsync_end = mode->vsync_start + fbmode->vsync_len;
+ mode->htotal = mode->hsync_end + fbmode->left_margin;
+ mode->vtotal = mode->vsync_end + fbmode->upper_margin;
+ mode->vrefresh = fbmode->refresh;
+ mode->clock = PICOS2KHZ(fbmode->pixclock);
+
+ if ((fbmode->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED)
+ mode->flags |= DRM_MODE_FLAG_INTERLACE;
+
+ if ((fbmode->vmode & FB_VMODE_MASK) == FB_VMODE_DOUBLE)
+ mode->flags |= DRM_MODE_FLAG_DBLSCAN;
+
+ drm_mode_set_name(mode);
+}
+EXPORT_SYMBOL(fbmode_to_drm_display_mode);
+
int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
@@ -762,6 +816,7 @@ int drm_fb_helper_single_fb_probe(struct drm_device *dev,
int crtc_count = 0;
int ret, i, conn_count = 0;
struct fb_info *info;
+ struct fb_videomode fbmode;
struct drm_framebuffer *fb;
struct drm_mode_set *modeset = NULL;
struct drm_fb_helper *fb_helper;
@@ -891,8 +946,11 @@ int drm_fb_helper_single_fb_probe(struct drm_device *dev,
fb_helper->crtc_count = crtc_count;
fb_helper->fb = fb;
+ /* Convert from drm mode to fb_var_screeninfo */
+ drm_display_mode_to_fbmode(modeset->mode, &fbmode);
+ fb_videomode_to_var(&info->var, &fbmode);
+
if (new_fb) {
- info->var.pixclock = 0;
ret = fb_alloc_cmap(&info->cmap, modeset->crtc->gamma_size, 0);
if (ret)
return ret;
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 58c892a..29fdb01 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -99,6 +99,10 @@ int drm_fb_helper_setcolreg(unsigned regno,
struct fb_info *info);
void drm_fb_helper_restore(void);
+void drm_display_mode_to_fbmode(struct drm_display_mode *mode,
+ struct fb_videomode *fbmode);
+void fbmode_to_drm_display_mode(struct fb_videomode *fbmode,
+ struct drm_display_mode *mode);
void drm_fb_helper_fill_var(struct fb_info *info, struct drm_framebuffer *fb,
uint32_t fb_width, uint32_t fb_height);
void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
------------------------------------------------------------------------------
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