From: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Fri, 24 Jun 2011 19:19:26 +0000 (-0700)
Subject: drm: bpp and depth changes require full mode sets
X-Git-Tag: firefly_0821_release~3680^2~4922^2~18^2~21
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=46e484566fe4dc8a34e0ccc154e2f8b939b9ec96;p=firefly-linux-kernel-4.4.55.git

drm: bpp and depth changes require full mode sets

To properly drive a framebuffer with a new depth or bpp, dither settings
and link bandwidth calculations may change, so make sure we go through a
full mode set in that case.

Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Keith Packard <keithp@keithp.com>
---

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 92369655dca3..f88a9b2c977b 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -560,6 +560,11 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
 			mode_changed = true;
 		} else if (set->fb == NULL) {
 			mode_changed = true;
+		} else if (set->fb->depth != set->crtc->fb->depth) {
+			mode_changed = true;
+		} else if (set->fb->bits_per_pixel !=
+			   set->crtc->fb->bits_per_pixel) {
+			mode_changed = true;
 		} else
 			fb_changed = true;
 	}