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Commit b0a67932 authored by Dima Zavin's avatar Dima Zavin Committed by David Brown
Browse files

video: msmfb: Put the partial update magic value into the fix_screen struct. 



This can then be tested by userspace to see if the capability is supported.
Userspace cannot rely on that value being left in var_screen, since userspace
itself can change it.

Signed-off-by: default avatarDima Zavin <dima@android.com>
Signed-off-by: default avatarCarl Vanderlip <carlv@codeaurora.org>
Signed-off-by: default avatarDavid Brown <davidb@codeaurora.org>
parent bd32344a

drivers/video/msm/msm_fb.c

+12 −0
Original line number Diff line number Diff line
@@ -469,6 +469,18 @@ static void setup_fb_info(struct msmfb_info *msmfb) 
	fb_info->var.yoffset = 0;



	if (msmfb->panel->caps & MSMFB_CAP_PARTIAL_UPDATES) {

		/*

		 * Set the param in the fixed screen, so userspace can't

		 * change it. This will be used to check for the

		 * capability.

		 */

		fb_info->fix.reserved[0] = 0x5444;

		fb_info->fix.reserved[1] = 0x5055;



		/*

		 * This preloads the value so that if userspace doesn't

		 * change it, it will be a full update

		 */

		fb_info->var.reserved[0] = 0x54445055;

		fb_info->var.reserved[1] = 0;

		fb_info->var.reserved[2] = (uint16_t)msmfb->xres |