From: Sylwester Nawrocki Date: Fri, 21 Sep 2012 18:18:41 +0000 (-0300) Subject: [media] s5p-csis: Add support for non-image data packets capture X-Git-Tag: v3.7-rc1~38^2^2~95 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=36fa80927638babe523dce14f3408f9fdefa86d3;p=pandora-kernel.git [media] s5p-csis: Add support for non-image data packets capture MIPI-CSI has internal memory mapped buffers for the frame embedded (non-image) data. There are two buffers, for even and odd frames which need to be saved after an interrupt is raised. The packet data buffers size is 4 KiB and there is no status register in the hardware where the actual non-image data size can be read from. Hence the driver copies whole packet data buffer into a buffer provided by the FIMC driver. This will form a separate plane in the user buffer. When FIMC DMA engine is stopped by the driver due the to user space not keeping up with buffer de-queuing the MIPI-CSIS will still run, however it must discard data which is not captured by FIMC. Which frames are actually capture by MIPI-CSIS is determined by means of the s_tx_buffer subdev callback. When it is not called after a single embedded data frame has been captured and copied and before next embedded data frame interrupt occurrs, subsequent embedded data frames will be dropped. Signed-off-by: Sylwester Nawrocki Signed-off-by: Andrzej Hajda Signed-off-by: Kyungmin Park Signed-off-by: Mauro Carvalho Chehab --- Reading git-diff-tree failed