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This patch is from Linux, commit 3856081eede2. The commit message there is: > commit 3856081eede297b617560b85e948cfb00bb395ec > Author: Y.C. Chen <yc_chen@aspeedtech.com> > Date: Thu Feb 23 15:52:33 2017 +0800 > > drm/ast: Fix AST2400 POST failure without BMC FW or VBIOS > > The current POST code for the AST2300/2400 family doesn't work properly > if the chip hasn't been initialized previously by either the BMC own FW > or the VBIOS. This fixes it. > > Signed-off-by: Y.C. Chen <yc_chen@aspeedtech.com> > Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> > Tested-by: Y.C. Chen <yc_chen@aspeedtech.com> > Acked-by: Joel Stanley <joel@jms.id.au> > Cc: <stable@vger.kernel.org> > Signed-off-by: Dave Airlie <airlied@redhat.com> Tested on a Supermicro X10SLM+-F with an AST 2400 where the BMC flash chip has been completely erased. Before the patch, the display resembled a rainbow. After the patch, the display works well. Original-Signed-off-by: Y.C. Chen <yc_chen@aspeedtech.com> Original-Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Original-Tested-by: Y.C. Chen <yc_chen@aspeedtech.com> Original-Signed-off-by: Dave Airlie <airlied@redhat.com> Change-Id: I72efcf907fbd1263fe21d4f36fe900b305419c44 Signed-off-by: Tristan Corrick <tristan@corrick.kiwi> Reviewed-on: https://review.coreboot.org/c/30507 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>