drm/vc4: Fix pitch setup for T-format scanout.
The documentation said to use src_w here, and I didn't consider that we actually needed to be using pitch somewhere in our setup. Fixes scanout on my DSI panel when X11 does initial setup with 1920x1080 HDMI and 800x480 DSI both at 0,0 of the same framebuffer. v2: Add some comments requested by Boris Signed-off-by: NEric Anholt <eric@anholt.net> Fixes: 98830d91 ("drm/vc4: Add T-format scanout support.") Link: https://patchwork.freedesktop.org/patch/msgid/20170927193209.11870-1-eric@anholt.netReviewed-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
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