drm/nouveau/kms/nv50: use "low res" lut for indexed mode

Web:        https://git.kernel.org/torvalds/c/e75182f68b7b3a073e33b89ee4c1688160755930
Commit:     e75182f68b7b3a073e33b89ee4c1688160755930
Parent:     11fc017dfb1efffa93d803f7182d026962ea2aae
Refname:    refs/heads/master
Author:     Ilia Mirkin <[email protected]>
AuthorDate: Sat Dec 30 23:35:28 2017 -0500
Committer:  Ben Skeggs <[email protected]>
CommitDate: Fri Feb 2 15:24:06 2018 +1000

    drm/nouveau/kms/nv50: use "low res" lut for indexed mode
    
    This is what was done prior to the big refactor in kernel 3.8, and what
    was done by xf86-video-nv. Experimentally, it seems like there's some
    sort of issue with the high-res lut to be used there. Tested on G92.
    
    This ends up mattering because fbcon/fbdev chooses the C8 fb format for
    low-vram systems, which can occur with some IGP-based configurations
    with little "stolen" vram.
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80675
    Signed-off-by: Ilia Mirkin <[email protected]>
    Signed-off-by: Ben Skeggs <[email protected]>
---
 drivers/gpu/drm/nouveau/nv50_display.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
index 2293b8ff56c6..f4daf8c55de1 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -1805,12 +1805,14 @@ nv50_head_lut_set(struct nv50_head *head, struct nv50_head_atom *asyh)
 	if ((push = evo_wait(core, 7))) {
 		if (core->base.user.oclass < G82_DISP_CORE_CHANNEL_DMA) {
 			evo_mthd(push, 0x0840 + (head->base.index * 0x400), 2);
-			evo_data(push, 0xc0000000);
+			evo_data(push, asyh->base.depth == 8 ?
+				 0x80000000 : 0xc0000000);
 			evo_data(push, asyh->lut.offset >> 8);
 		} else
 		if (core->base.user.oclass < GF110_DISP_CORE_CHANNEL_DMA) {
 			evo_mthd(push, 0x0840 + (head->base.index * 0x400), 2);
-			evo_data(push, 0xc0000000);
+			evo_data(push, asyh->base.depth == 8 ?
+				 0x80000000 : 0xc0000000);
 			evo_data(push, asyh->lut.offset >> 8);
 			evo_mthd(push, 0x085c + (head->base.index * 0x400), 1);
 			evo_data(push, asyh->lut.handle);
--
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