V4L/DVB (5971): ivtv-fb: framebuffer timings no longer locked on module load

Framebuffer timings are currently locked to the video format in use when the
module is loaded. If the video format is then changed, the timings returned
by the framebuffer will be for the original format.

This patch ensures that the timings returned reflect the current video format.
Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/ivtv/ivtv-fb.c

@@ -164,11 +164,6 @@ MODULE_LICENSE("GPL");
 #define IVTV_OSD_BPP_32     0x04
 
 struct osd_info {
-	/* Timing info for modes */
-	u32 pixclock;
-	u32 hlimit;
-	u32 vlimit;
-
 	/* Physical base address */
 	unsigned long video_pbase;
 	/* Relative base address (relative to start of decoder memory) */
@@ -579,10 +574,25 @@ static int ivtvfb_get_fix(struct ivtv *itv, struct fb_fix_screeninfo *fix)
 static int _ivtvfb_check_var(struct fb_var_screeninfo *var, struct ivtv *itv)
 {
 	struct osd_info *oi = itv->osd_info;
-	int osd_height_limit = itv->is_50hz ? 576 : 480;
+	int osd_height_limit;
+	u32 pixclock, hlimit, vlimit;
 
 	IVTV_FB_DEBUG_INFO("ivtvfb_check_var\n");
 
+	/* Set base references for mode calcs. */
+	if (itv->is_50hz) {
+		pixclock = 84316;
+		hlimit = 776;
+		vlimit = 591;
+		osd_height_limit = 576;
+	}
+	else {
+		pixclock = 83926;
+		hlimit = 776;
+		vlimit = 495;
+		osd_height_limit = 480;
+	}
+
 	/* Check the bits per pixel */
 	if (osd_compat) {
 		if (var->bits_per_pixel != 32) {
@@ -723,8 +733,8 @@ static int _ivtvfb_check_var(struct fb_var_screeninfo *var, struct ivtv *itv)
 	}
 
 	/* Maintain overall 'size' for a constant refresh rate */
-	var->right_margin = oi->hlimit - var->left_margin - var->xres;
-	var->lower_margin = oi->vlimit - var->upper_margin - var->yres;
+	var->right_margin = hlimit - var->left_margin - var->xres;
+	var->lower_margin = vlimit - var->upper_margin - var->yres;
 
 	/* Fixed sync times */
 	var->hsync_len = 24;
@@ -733,9 +743,10 @@ static int _ivtvfb_check_var(struct fb_var_screeninfo *var, struct ivtv *itv)
 	/* Non-interlaced / interlaced mode is used to switch the OSD filter
 	   on or off. Adjust the clock timings to maintain a constant
 	   vertical refresh rate. */
-	var->pixclock = oi->pixclock;
 	if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_NONINTERLACED)
-		var->pixclock /= 2;
+		var->pixclock = pixclock / 2;
+	else
+		var->pixclock = pixclock;
 
 	IVTV_FB_DEBUG_INFO("Display size: %dx%d (virtual %dx%d) @ %dbpp\n",
 		      var->xres, var->yres,
@@ -875,18 +886,6 @@ static int ivtvfb_init_vidmode(struct ivtv *itv)
 	struct v4l2_rect start_window;
 	int max_height;
 
-	/* Set base references for mode calcs. */
-	if (itv->is_50hz) {
-		oi->pixclock = 84316;
-		oi->hlimit = 776;
-		oi->vlimit = 591;
-	}
-	else {
-		oi->pixclock = 83926;
-		oi->hlimit = 776;
-		oi->vlimit = 495;
-	}
-
 	/* Color mode */
 
 	if (osd_compat) osd_depth = 32;