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atmel_lcdfb: FIFO underflow management

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Manage atmel_lcdfb FIFO underflow

Resetting the LCD and DMA allows to fix screen shifting after a FIFO
underflow.  It follows reset sequence from errata "LCD Screen Shifting
After a Reset".

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nicolas Ferre 2008-07-23 21:31:20 -07:00 • committed by Linus Torvalds
commit d22579b837
2 changed files with 57 additions and 1 deletions
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1
include/video/atmel_lcdc.h
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@ -37,6 +37,7 @@ struct atmel_lcdfb_info {
struct fb_info *info;
void __iomem *mmio;
unsigned long irq_base;
struct work_struct task;
unsigned int guard_time;
struct platform_device *pdev;