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authorAditya Nellutla <aditya.n@ti.com>2012-05-23 11:36:31 +0530
committerFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>2012-06-27 07:01:38 +0000
commit3b9cc4ea4735d3c73ee27ef7b829b6fe4535eefe (patch)
tree0f7dcb034408d66ebe67a16bcfdb7eaed8d562d0 /drivers/video/da8xx-fb.c
parent41a490ec019fd172f5d0356e01d8101b4708aee2 (diff)
downloadop-kernel-dev-3b9cc4ea4735d3c73ee27ef7b829b6fe4535eefe.zip
op-kernel-dev-3b9cc4ea4735d3c73ee27ef7b829b6fe4535eefe.tar.gz
da8xx-fb: Rounding FB size to satisfy SGX buffer requirements
In the real time use-case when SGX is used for rendering to FB buffers it has been observed that, the available memory from framebuffer driver is not sufficient for SGX under certain cases (like 16-bit WVGA resolution). SGX requires 2 swap buffers with each of the buffers aligned to lcm(line_length, PAGE_SIZE). Inorder to satisfy this requirement, we have two options, - Increase number of FB buffers (LCD_NUM_BUFFERS) to 3. This is not recommended as we end up wasting huge memory in most of the cases. - Align FB buffers to lcm(line_length, PAGE_SIZE).This ensures framebuffer size is increased to satisfy SGX requirements keeping alignment intact. This patch makes sure that FB allocates buffers aligned to above formula. Signed-off-by: Aditya Nellutla <aditya.n@ti.com> Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Diffstat (limited to 'drivers/video/da8xx-fb.c')
-rw-r--r--drivers/video/da8xx-fb.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index 47118c7..2f24c19 100644
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c
@@ -31,6 +31,7 @@
#include <linux/cpufreq.h>
#include <linux/console.h>
#include <linux/slab.h>
+#include <linux/lcm.h>
#include <video/da8xx-fb.h>
#include <asm/div64.h>
@@ -1114,6 +1115,7 @@ static int __devinit fb_probe(struct platform_device *device)
struct da8xx_fb_par *par;
resource_size_t len;
int ret, i;
+ unsigned long ulcm;
if (fb_pdata == NULL) {
dev_err(&device->dev, "Can not get platform data\n");
@@ -1209,7 +1211,8 @@ static int __devinit fb_probe(struct platform_device *device)
/* allocate frame buffer */
par->vram_size = lcdc_info->width * lcdc_info->height * lcd_cfg->bpp;
- par->vram_size = PAGE_ALIGN(par->vram_size/8);
+ ulcm = lcm((lcdc_info->width * lcd_cfg->bpp)/8, PAGE_SIZE);
+ par->vram_size = roundup(par->vram_size/8, ulcm);
par->vram_size = par->vram_size * LCD_NUM_BUFFERS;
par->vram_virt = dma_alloc_coherent(NULL,
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