From b137bd8c8d75062719c2fe2880205f8b707a89a8 Mon Sep 17 00:00:00 2001 From: "Wu, Josh" Date: Mon, 19 May 2014 19:51:27 +0800 Subject: [PATCH] video: atmel_hlcdfb: enable dcache support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit To support dcache, we need flush DMA descriptor buffer before enable lcd DMA. Also we need call lcd_set_flush_dcache(1) to make lcd driver flush the lcd buffer if there is any change. Cc: Anatolij Gustschin Signed-off-by: Josh Wu Acked-by: Anatolij Gustschin Signed-off-by: Andreas Bießmann --- drivers/video/atmel_hlcdfb.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/video/atmel_hlcdfb.c b/drivers/video/atmel_hlcdfb.c index bb4d7d8..935ae42 100644 --- a/drivers/video/atmel_hlcdfb.c +++ b/drivers/video/atmel_hlcdfb.c @@ -171,6 +171,9 @@ void lcd_ctrl_init(void *lcdbase) | LCDC_BASECTRL_DMAIEN | LCDC_BASECTRL_DFETCH; desc->next = (u32)desc; + /* Flush the DMA descriptor if we enabled dcache */ + flush_dcache_range((u32)desc, (u32)desc + sizeof(*desc)); + lcdc_writel(®s->lcdc_baseaddr, desc->address); lcdc_writel(®s->lcdc_basectrl, desc->control); lcdc_writel(®s->lcdc_basenext, desc->next); @@ -194,4 +197,7 @@ void lcd_ctrl_init(void *lcdbase) lcdc_writel(®s->lcdc_lcden, value | LCDC_LCDEN_PWMEN); while (!(lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS)) udelay(1); + + /* Enable flushing if we enabled dcache */ + lcd_set_flush_dcache(1); }