1 files changed, 18 insertions, 13 deletions

diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
index 1e784adb89b1..3a010641f630 100644
--- a/drivers/video/fbdev/efifb.c
+++ b/drivers/video/fbdev/efifb.c
@@ -149,6 +149,10 @@ ATTRIBUTE_GROUPS(efifb);
 
 static bool pci_dev_disabled;	/* FB base matches BAR of a disabled device */
 
+static struct pci_dev *efifb_pci_dev;	/* dev with BAR covering the efifb */
+static struct resource *bar_resource;
+static u64 bar_offset;
+
 static int efifb_probe(struct platform_device *dev)
 {
 	struct fb_info *info;
@@ -203,6 +207,13 @@ static int efifb_probe(struct platform_device *dev)
 		efifb_fix.smem_start |= ext_lfb_base;
 	}
 
+	if (bar_resource &&
+	    bar_resource->start + bar_offset != efifb_fix.smem_start) {
+		dev_info(&efifb_pci_dev->dev,
+			 "BAR has moved, updating efifb address\n");
+		efifb_fix.smem_start = bar_resource->start + bar_offset;
+	}
+
 	efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 	efifb_defined.xres = screen_info.lfb_width;
 	efifb_defined.yres = screen_info.lfb_height;
@@ -370,15 +381,13 @@ static struct platform_driver efifb_driver = {
 
 builtin_platform_driver(efifb_driver);
 
-#if defined(CONFIG_PCI) && !defined(CONFIG_X86)
-
-static bool pci_bar_found;	/* did we find a BAR matching the efifb base? */
+#if defined(CONFIG_PCI)
 
-static void claim_efifb_bar(struct pci_dev *dev, int idx)
+static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
 {
 	u16 word;
 
-	pci_bar_found = true;
+	efifb_pci_dev = dev;
 
 	pci_read_config_word(dev, PCI_COMMAND, &word);
 	if (!(word & PCI_COMMAND_MEMORY)) {
@@ -389,12 +398,8 @@ static void claim_efifb_bar(struct pci_dev *dev, int idx)
 		return;
 	}
 
-	if (pci_claim_resource(dev, idx)) {
-		pci_dev_disabled = true;
-		dev_err(&dev->dev,
-			"BAR %d: failed to claim resource for efifb!\n", idx);
-		return;
-	}
+	bar_resource = &dev->resource[idx];
+	bar_offset = offset;
 
 	dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
 }
@@ -405,7 +410,7 @@ static void efifb_fixup_resources(struct pci_dev *dev)
 	u64 size = screen_info.lfb_size;
 	int i;
 
-	if (pci_bar_found || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
+	if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 		return;
 
 	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
@@ -421,7 +426,7 @@ static void efifb_fixup_resources(struct pci_dev *dev)
 			continue;
 
 		if (res->start <= base && res->end >= base + size - 1) {
-			claim_efifb_bar(dev, i);
+			record_efifb_bar_resource(dev, i, base - res->start);
 			break;
 		}
 	}