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sh: LCDC dcache flush for deferred io

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Since writenotify on uncached vmas is unsupported in 2.6.31,
live with cached framebuffer memory in the deferred io
case for now and flush the dcache before forcing refresh.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Magnus damm <damm@igel.co.jp>
This commit is contained in:
Paul Mundt 2009-07-01 06:50:31 +00:00
parent 34e19ada99
commit 1c6a307a54
1 changed files with 45 additions and 8 deletions
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53
drivers/video/sh_mobile_lcdcfb.c
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@ -17,6 +17,7 @@
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/vmalloc.h>
#include <video/sh_mobile_lcdc.h>
#include <asm/atomic.h>
@ -33,6 +34,7 @@ struct sh_mobile_lcdc_chan {
struct fb_info info;
dma_addr_t dma_handle;
struct fb_deferred_io defio;
struct scatterlist *sglist;
unsigned long frame_end;
wait_queue_head_t frame_end_wait;
};
@ -206,16 +208,38 @@ static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv) {}
static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv) {}
#endif
static int sh_mobile_lcdc_sginit(struct fb_info *info,
struct list_head *pagelist)
{
struct sh_mobile_lcdc_chan *ch = info->par;
unsigned int nr_pages_max = info->fix.smem_len >> PAGE_SHIFT;
struct page *page;
int nr_pages = 0;
sg_init_table(ch->sglist, nr_pages_max);
list_for_each_entry(page, pagelist, lru)
sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);
return nr_pages;
}
static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
struct list_head *pagelist)
{
struct sh_mobile_lcdc_chan *ch = info->par;
unsigned int nr_pages;
/* enable clocks before accessing hardware */
sh_mobile_lcdc_clk_on(ch->lcdc);
nr_pages = sh_mobile_lcdc_sginit(info, pagelist);
dma_map_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
/* trigger panel update */
lcdc_write_chan(ch, LDSM2R, 1);
dma_unmap_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
}
static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
@ -846,21 +870,31 @@ static int __init sh_mobile_lcdc_probe(struct platform_device *pdev)
}
for (i = 0; i < j; i++) {
error = register_framebuffer(&priv->ch[i].info);
struct sh_mobile_lcdc_chan *ch = priv->ch + i;
info = &ch->info;
if (info->fbdefio) {
priv->ch->sglist = vmalloc(sizeof(struct scatterlist) *
info->fix.smem_len >> PAGE_SHIFT);
if (!priv->ch->sglist) {
dev_err(&pdev->dev, "cannot allocate sglist\n");
goto err1;
}
}
error = register_framebuffer(info);
if (error < 0)
goto err1;
}
for (i = 0; i < j; i++) {
info = &priv->ch[i].info;
dev_info(info->dev,
"registered %s/%s as %dx%d %dbpp.\n",
pdev->name,
(priv->ch[i].cfg.chan == LCDC_CHAN_MAINLCD) ?
(ch->cfg.chan == LCDC_CHAN_MAINLCD) ?
"mainlcd" : "sublcd",
(int) priv->ch[i].cfg.lcd_cfg.xres,
(int) priv->ch[i].cfg.lcd_cfg.yres,
priv->ch[i].cfg.bpp);
(int) ch->cfg.lcd_cfg.xres,
(int) ch->cfg.lcd_cfg.yres,
ch->cfg.bpp);
/* deferred io mode: disable clock to save power */
if (info->fbdefio)
@ -892,6 +926,9 @@ static int sh_mobile_lcdc_remove(struct platform_device *pdev)
if (!info->device)
continue;
if (priv->ch[i].sglist)
vfree(priv->ch[i].sglist);
dma_free_coherent(&pdev->dev, info->fix.smem_len,
info->screen_base, priv->ch[i].dma_handle);
fb_dealloc_cmap(&info->cmap);