The patch titled
atmel_lcdfb: LCDC startup fix
has been removed from the -mm tree. Its filename was
atmel_lcdfb-lcdc-startup-fix.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: atmel_lcdfb: LCDC startup fix
From: Anti Sullin <anti.sullin@xxxxxxxxxxxxxx>
This patch adds an additional loop, that delays turning off the DMA
until the LCDC core has been turned off. This prevents the picture
to be shifted some random length when the kernel re-initializes
the LCDC.
Without this patch, the LCDC keeps running for some small time after the
PWRCON:LCD_PWR has been cleared ; the FIFO suffers an underrun and on
re-starting the LCDC the FIFO data stays shifted.
This behavior has been seen and fixed on AT91SAM9261-EK and two custom
AT91SAM9261 boards, all of them having different LCD panels.
Thanks a lot to Anti Sullin for submitting this patch (long
time ago).
Signed-off-by: Anti Sullin <anti.sullin@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Victor <andrew@xxxxxxxxxxxxx>
Signed-off-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
Acked-by: Haavard Skinnemoen <hskinnemoen@xxxxxxxxx>
Cc: "Antonino A. Daplas" <adaplas@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/video/atmel_lcdfb.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN drivers/video/atmel_lcdfb.c~atmel_lcdfb-lcdc-startup-fix drivers/video/atmel_lcdfb.c
--- a/drivers/video/atmel_lcdfb.c~atmel_lcdfb-lcdc-startup-fix
+++ a/drivers/video/atmel_lcdfb.c
@@ -268,6 +268,10 @@ static int atmel_lcdfb_set_par(struct fb
/* Turn off the LCD controller and the DMA controller */
lcdc_writel(sinfo, ATMEL_LCDC_PWRCON, sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
+ /* Wait for the LCDC core to become idle */
+ while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
+ msleep(10);
+
lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
if (info->var.bits_per_pixel == 1)
_
Patches currently in -mm which might be from anti.sullin@xxxxxxxxxxxxxx are
origin.patch
-
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