[PATCH 1/4] video: msmfb: Put the partial update magic value into the fix_screen struct.
From: Carl Vanderlip <hidden>
Date: 2011-03-02 21:16:51
Also in:
linux-arm-kernel, linux-arm-msm, lkml
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
From: Dima Zavin <redacted> 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 <redacted> Signed-off-by: Carl Vanderlip <redacted> --- drivers/video/msm/msm_fb.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/drivers/video/msm/msm_fb.c b/drivers/video/msm/msm_fb.c
index 5436aeb..fe5efe5 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 |
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