]> git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/commit
DRM: armada: fix corruption while loading cursors
authorRussell King <rmk+kernel@arm.linux.org.uk>
Mon, 7 Apr 2014 11:00:17 +0000 (12:00 +0100)
committerDave Airlie <airlied@redhat.com>
Tue, 8 Apr 2014 00:51:03 +0000 (10:51 +1000)
commitc39b06951f1dc2e384650288676c5b7dcc0ec92c
treef6433db17fd6e3197473b719076464a0a635efa5
parent9f97ba806a9cb8e828baca71eca8b684939053d8
DRM: armada: fix corruption while loading cursors

Loading cursors to the LCD controller's SRAM can be corrupted when the
configured pixel clock is relatively slow.  This seems to be caused
when we write back-to-back to the SRAM registers.

There doesn't appear to be any status register we can read to check
when an access has completed.

Inserting a dummy read between the writes appears to fix the problem.

Cc: <stable@vger.kernel.org> # 3.13
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>
drivers/gpu/drm/armada/armada_crtc.c