From: Dima Zavin Date: Wed, 2 Mar 2011 21:16:36 +0000 (-0800) Subject: video: msmfb: Put the partial update magic value into the fix_screen struct. X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=b0a679326ce90e65779178906df5b8b6180163d6;p=deliverable%2Flinux.git 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: Dima Zavin Signed-off-by: Carl Vanderlip Signed-off-by: David Brown --- diff --git a/drivers/video/msm/msm_fb.c b/drivers/video/msm/msm_fb.c index 5436aeb94456..fe5efe59d5c5 100644 --- a/drivers/video/msm/msm_fb.c +++ b/drivers/video/msm/msm_fb.c @@ -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 |