7001-drm-i915-fbdev-Discard-BIOS-framebuffers-exceeding-h.patch

From 155bb242ee7f4e177386fbdec565db6d4a173d5e Mon Sep 17 00:00:00 2001
From: Aun-Ali Zaidi <admin@kodeit.net>
Date: Wed, 16 Sep 2020 18:31:10 -0500
Subject: [PATCH] drm/i915/fbdev: Discard BIOS framebuffers exceeding hardware
 supported size

On certain devices with high-DPI panels, the BIOS supplied framebuffer is larger
than what is physically supported by the panel, resulting in overscan. A previous
check introduced with edd586fe ("drm/i915: Discard BIOS framebuffers too small to
accommodate chosen mode"), handles the lower bound case. We extend that check
to include the upper bound case.

Signed-off-by: Aun-Ali Zaidi <admin@kodeit.net>
---
 drivers/gpu/drm/i915/display/intel_fbdev.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index bd39eb6a21b8..1949526cbe20 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -181,10 +181,12 @@ static int intelfb_create(struct drm_fb_helper *helper,
 	int ret;
 
 	if (intel_fb &&
-	    (sizes->fb_width > intel_fb->base.width ||
-	     sizes->fb_height > intel_fb->base.height)) {
+	    ((sizes->fb_width > intel_fb->base.width ||
+	      sizes->fb_height > intel_fb->base.height) ||
+	     (sizes->fb_width < intel_fb->base.width ||
+	      sizes->fb_height < intel_fb->base.height))) {
 		drm_dbg_kms(&dev_priv->drm,
-			    "BIOS fb too small (%dx%d), we require (%dx%d),"
+			    "BIOS fb invalid size (%dx%d), we require (%dx%d),"
 			    " releasing it\n",
 			    intel_fb->base.width, intel_fb->base.height,
 			    sizes->fb_width, sizes->fb_height);
-- 
2.28.0