fbdev: imxfb: Replace check_fb in favor of struct fb_info.lcd_dev

Store the lcd device in struct fb_info.lcd_dev. The lcd subsystem can
now detect the lcd's fbdev device from this field.

This makes the implementation of check_fb in imxfb_lcd_ops obsolete.
Remove it.

Signed-off-by: Thomas Zimmermann <[e-mail]>
Reviewed-by: Daniel Thompson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/video/fbdev/imxfb.c

···
 	return 0;
 }
 
-static int imxfb_lcd_check_fb(struct lcd_device *lcddev, struct fb_info *fi)
-{
-	struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
-
-	if (!fi || fi->par == fbi)
-		return 1;
-
-	return 0;
-}
-
 static int imxfb_lcd_get_contrast(struct lcd_device *lcddev)
 {
 	struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
···
 }
 
 static const struct lcd_ops imxfb_lcd_ops = {
-	.check_fb	= imxfb_lcd_check_fb,
 	.get_contrast	= imxfb_lcd_get_contrast,
 	.set_contrast	= imxfb_lcd_set_contrast,
 	.get_power	= imxfb_lcd_get_power,
···
 		goto failed_cmap;
 
 	imxfb_set_par(info);
-	ret = register_framebuffer(info);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to register framebuffer\n");
-		goto failed_register;
-	}
 
 	fbi->lcd_pwr = devm_regulator_get(&pdev->dev, "lcd");
 	if (PTR_ERR(fbi->lcd_pwr) == -EPROBE_DEFER) {
···
 
 	lcd->props.max_contrast = 0xff;
 
+	info->lcd_dev = lcd;
+
+	ret = register_framebuffer(info);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to register framebuffer\n");
+		goto failed_lcd;
+	}
+
 	imxfb_enable_controller(fbi);
 
 	return 0;
 
 failed_lcd:
-	unregister_framebuffer(info);
-failed_register:
 	fb_dealloc_cmap(&info->cmap);
 failed_cmap:
 	dma_free_wc(&pdev->dev, fbi->map_size, info->screen_buffer,