On 18/07/17 11:20 AM, Takashi Iwai wrote:
From: Egbert Eich <eich@xxxxxxx>
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@xxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
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.
[...]
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)
Looks reasonable to me — if nothing else, at least the comment and code
will match again! :)
My only potential doubt is whether there could be another reason than
VRAM size why RN50 should use 8 bpp. Assuming not,
Reviewed-by: Michel Dänzer <michel.daenzer@xxxxxxx>
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
