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authorRussell King <rmk+kernel@arm.linux.org.uk>2014-04-07 12:00:17 +0100
committerDave Airlie <airlied@redhat.com>2014-04-08 10:51:03 +1000
commitc39b06951f1dc2e384650288676c5b7dcc0ec92c (patch)
treef6433db17fd6e3197473b719076464a0a635efa5
parent9f97ba806a9cb8e828baca71eca8b684939053d8 (diff)
downloadlinux-c39b06951f1dc2e384650288676c5b7dcc0ec92c.tar.bz2
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>
-rw-r--r--drivers/gpu/drm/armada/armada_crtc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/armada/armada_crtc.c b/drivers/gpu/drm/armada/armada_crtc.c
index 5831e4109e75..81c34f949dfc 100644
--- a/drivers/gpu/drm/armada/armada_crtc.c
+++ b/drivers/gpu/drm/armada/armada_crtc.c
@@ -679,6 +679,7 @@ static void armada_load_cursor_argb(void __iomem *base, uint32_t *pix,
base + LCD_SPU_SRAM_WRDAT);
writel_relaxed(addr | SRAM_WRITE,
base + LCD_SPU_SRAM_CTRL);
+ readl_relaxed(base + LCD_SPU_HWC_OVSA_HPXL_VLN);
addr += 1;
if ((addr & 0x00ff) == 0)
addr += 0xf00;