staging: bcm2835-camera: Fix stride on RGB3/BGR3 formats

RGB3/BGR3 end up being 3 bytes per pixel, which meant that
the alignment code ended up trying to align using bitmasking
with a mask of 96.
That doesn't work, so switch to an arithmetic alignment for
those formats.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>

diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
index 19880b6..b8984dc 100644 (file)
--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -1008,13 +1008,27 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
                              1, 0);
        f->fmt.pix.bytesperline = f->fmt.pix.width * mfmt->ybbp;
        if (!mfmt->remove_padding) {
-               int align_mask = ((32 * mfmt->depth) >> 3) - 1;
-               /* GPU isn't removing padding, so stride is aligned to 32 */
-               f->fmt.pix.bytesperline =
-                       (f->fmt.pix.bytesperline + align_mask) & ~align_mask;
+               if (mfmt->depth == 24) {
+                       /*
+                        * 24bpp is a pain as we can't use simple masking.
+                        * Min stride is width aligned to 16, times 24bpp.
+                        */
+                       f->fmt.pix.bytesperline =
+                               ((f->fmt.pix.width + 15) & ~15) * 3;
+               } else {
+                       /*
+                        * GPU isn't removing padding, so stride is aligned to
+                        * 32
+                        */
+                       int align_mask = ((32 * mfmt->depth) >> 3) - 1;
+
+                       f->fmt.pix.bytesperline =
+                               (f->fmt.pix.bytesperline + align_mask) &
+                                                       ~align_mask;
+               }
                v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev,
-                        "Not removing padding, so bytes/line = %d, (align_mask %d)\n",
-                        f->fmt.pix.bytesperline, align_mask);
+                        "Not removing padding, so bytes/line = %d\n",
+                        f->fmt.pix.bytesperline);
        }
 
        /* Image buffer has to be padded to allow for alignment, even though