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authorMarek Vasut <marex@denx.de>2016-08-26 17:53:35 +0200
committerTomi Valkeinen <tomi.valkeinen@ti.com>2016-08-30 11:59:33 +0300
commit03577d6a0beff2aded55d4ae40d1058905233536 (patch)
tree7a95c783678ee0307b077a57be45e52fff7cc225 /drivers/video
parentb86acbefa3814565b71ec9661329f7def0cc10f2 (diff)
video: mxsfb: Fix framebuffer corruption on mx6sx
Allocate the framebuffer memory as coherent, otherwise the framebuffer will suffer from artifacts when displaying scrolling text or video. This can be replicated on i.MX6SX (armv7), which has more complex memory architecture compared to the i.MX23/28 (armv5). Signed-off-by: Marek Vasut <marex@denx.de> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com> Cc: Fabio Estevam <fabio.estevam@nxp.com> Cc: Lucas Stach <l.stach@pengutronix.de> Cc: Shawn Guo <shawnguo@kernel.org> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/fbdev/mxsfb.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/video/fbdev/mxsfb.c b/drivers/video/fbdev/mxsfb.c
index 4e6608ceac09..7846f0e8bbbb 100644
--- a/drivers/video/fbdev/mxsfb.c
+++ b/drivers/video/fbdev/mxsfb.c
@@ -800,6 +800,7 @@ static int mxsfb_init_fbinfo(struct mxsfb_info *host,
struct fb_videomode *vmode)
{
int ret;
+ struct device *dev = &host->pdev->dev;
struct fb_info *fb_info = &host->fb_info;
struct fb_var_screeninfo *var = &fb_info->var;
dma_addr_t fb_phys;
@@ -825,12 +826,10 @@ static int mxsfb_init_fbinfo(struct mxsfb_info *host,
/* Memory allocation for framebuffer */
fb_size = SZ_2M;
- fb_virt = alloc_pages_exact(fb_size, GFP_DMA);
+ fb_virt = dma_alloc_wc(dev, PAGE_ALIGN(fb_size), &fb_phys, GFP_KERNEL);
if (!fb_virt)
return -ENOMEM;
- fb_phys = virt_to_phys(fb_virt);
-
fb_info->fix.smem_start = fb_phys;
fb_info->screen_base = fb_virt;
fb_info->screen_size = fb_info->fix.smem_len = fb_size;
@@ -843,9 +842,11 @@ static int mxsfb_init_fbinfo(struct mxsfb_info *host,
static void mxsfb_free_videomem(struct mxsfb_info *host)
{
+ struct device *dev = &host->pdev->dev;
struct fb_info *fb_info = &host->fb_info;
- free_pages_exact(fb_info->screen_base, fb_info->fix.smem_len);
+ dma_free_wc(dev, fb_info->screen_size, fb_info->screen_base,
+ fb_info->fix.smem_start);
}
static const struct platform_device_id mxsfb_devtype[] = {