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Commit 3de392d1 authored by Jeevan Shriram's avatar Jeevan Shriram Committed by Gerrit - the friendly Code Review server
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mdss: fb: Add page protection flag in mmap call 



Add page protection flag to avoid screen corruption
in pan display path.

Change-Id: Iae57ee85fd20730f5842629c5cf8778da56a13d3
Signed-off-by: default avatarJeevan Shriram <jshriram@codeaurora.org>
parent 1559d923

drivers/video/msm/mdss/mdss_fb.c

+13 −4
Original line number Diff line number Diff line
@@ -1283,6 +1283,11 @@ static int mdss_fb_fbmem_ion_mmap(struct fb_info *info, 
			}

			len = min(len, remainder);



			if (mfd->mdp_fb_page_protection ==

					MDP_FB_PAGE_PROTECTION_WRITECOMBINE)

				vma->vm_page_prot =

					pgprot_writecombine(vma->vm_page_prot);



			pr_debug("vma=%p, addr=%x len=%ld",

					vma, (unsigned int)addr, len);

			pr_cont("vm_start=%x vm_end=%x vm_page_prot=%ld\n",
@@ -1324,6 +1329,7 @@ static int mdss_fb_physical_mmap(struct fb_info *info, 
	unsigned long start = info->fix.smem_start;

	u32 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);

	unsigned long off = vma->vm_pgoff << PAGE_SHIFT;

	struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)info->par;



	if (!start) {

		pr_warn("No framebuffer memory is allocated\n");
@@ -1343,6 +1349,9 @@ static int mdss_fb_physical_mmap(struct fb_info *info, 
	/* This is an IO map - tell maydump to skip this VMA */

	vma->vm_flags |= VM_IO;



	if (mfd->mdp_fb_page_protection == MDP_FB_PAGE_PROTECTION_WRITECOMBINE)

		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);



	/* Remap the frame buffer I/O range */

	if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,

				vma->vm_end - vma->vm_start,