From: Takashi Iwai <tiwai-l3A5Bk7waGM@public.gmane.org>
To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Cc: "Alex Deucher" <alexander.deucher-5C7GfCeVMHo@public.gmane.org>,
"David Airlie" <airlied-cv59FeDIM0c@public.gmane.org>,
"Christian König" <christian.koenig-5C7GfCeVMHo@public.gmane.org>,
dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [PATCH] drm/radeon: Set depth on low mem to 16 bpp instead of 8 bpp
Date: Tue, 18 Jul 2017 17:20:53 +0200 [thread overview]
Message-ID: <20170718152053.15050-1-tiwai@suse.de> (raw)
From: Egbert Eich <eich@suse.de>
The radeon driver reduces the framebuffer resolution to 8bpp if a
device with less than 32MB VRAM is found. This causes the framebuffer
to run in 8 bit paletted mode. For a text console this is not an
issue as 256 different colors is more than one gets on a VGA text
console. However this leads to a poor 8bit pseudo-color visual when
running X on fbdev, too, which is quite ugly.
In this patch, we try to give some moderate compromise: limit the
framebuffer bpp to 8 only when VRAM is 8MB or less, and use 16 bpp
otherwise for 32MB or less VRAM.
Signed-off-by: Egbert Eich <eich@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
This has been included in SUSE kernel for quite some time, and I'm
trying to upstream this. The 16bpp looks more reasonable nowadays,
but I know this is a matter of taste, too. It'd be great if you guys
can comment on this, at least, whether it's uttly non-sense or not.
thanks,
Takashi
drivers/gpu/drm/radeon/radeon_fb.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_fb.c b/drivers/gpu/drm/radeon/radeon_fb.c
index 356ad90a5238..b5f2642f124b 100644
--- a/drivers/gpu/drm/radeon/radeon_fb.c
+++ b/drivers/gpu/drm/radeon/radeon_fb.c
@@ -347,9 +347,12 @@ int radeon_fbdev_init(struct radeon_device *rdev)
if (list_empty(&rdev->ddev->mode_config.connector_list))
return 0;
- /* select 8 bpp console on RN50 or 16MB cards */
- if (ASIC_IS_RN50(rdev) || rdev->mc.real_vram_size <= (32*1024*1024))
+ /* select 8 bpp console on 8MB cards, or 16 bpp on RN50 or 32MB */
+ if (rdev->mc.real_vram_size <= (8*1024*1024))
bpp_sel = 8;
+ else if (ASIC_IS_RN50(rdev) ||
+ rdev->mc.real_vram_size <= (32*1024*1024))
+ bpp_sel = 16;
rfbdev = kzalloc(sizeof(struct radeon_fbdev), GFP_KERNEL);
if (!rfbdev)
--
2.13.2
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next reply other threads:[~2017-07-18 15:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-18 15:20 Takashi Iwai [this message]
2017-07-18 20:53 ` [PATCH] drm/radeon: Set depth on low mem to 16 bpp instead of 8 bpp Michel Dänzer
[not found] ` <7ad0c34d-0efe-c54e-28fb-fc5ba31f1700-otUistvHUpPR7s880joybQ@public.gmane.org>
2017-07-19 8:45 ` Takashi Iwai
[not found] ` <s5hk23495mu.wl-tiwai-l3A5Bk7waGM@public.gmane.org>
2017-07-24 20:46 ` Alex Deucher
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