[media] st-delta: STiH4xx multi-format video decoder v4l2 driver

This V4L2 driver enables DELTA multi-format video decoder
of STMicroelectronics STiH4xx SoC series.
Acked-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/Kconfig

@@ -312,6 +312,34 @@ config VIDEO_STI_HVA_DEBUGFS
 
           Choose N unless you know you need this.
 
+config VIDEO_STI_DELTA
+	tristate "STMicroelectronics DELTA multi-format video decoder V4L2 driver"
+	depends on VIDEO_DEV && VIDEO_V4L2
+	depends on ARCH_STI || COMPILE_TEST
+	depends on HAS_DMA
+	help
+		This V4L2 driver enables DELTA multi-format video decoder
+		of STMicroelectronics STiH4xx SoC series allowing hardware
+		decoding of various compressed video bitstream format in
+		raw uncompressed format.
+
+		Use this option to see the decoders available for such
+		hardware.
+
+		Please notice that the driver will only be built if
+		at least one of the DELTA decoder below is selected.
+
+if VIDEO_STI_DELTA
+
+config VIDEO_STI_DELTA_DRIVER
+	tristate
+	depends on VIDEO_STI_DELTA
+	default n
+	select VIDEOBUF2_DMA_CONTIG
+	select V4L2_MEM2MEM_DEV
+
+endif # VIDEO_STI_DELTA
+
 config VIDEO_SH_VEU
 	tristate "SuperH VEU mem2mem video processing driver"
 	depends on VIDEO_DEV && VIDEO_V4L2 && HAS_DMA

drivers/media/platform/Makefile

@@ -39,6 +39,8 @@ obj-$(CONFIG_VIDEO_STI_BDISP)		+= sti/bdisp/
 obj-$(CONFIG_VIDEO_STI_HVA)		+= sti/hva/
 obj-$(CONFIG_DVB_C8SECTPFE)		+= sti/c8sectpfe/
 
+obj-$(CONFIG_VIDEO_STI_DELTA)		+= sti/delta/
+
 obj-$(CONFIG_BLACKFIN)                  += blackfin/
 
 obj-$(CONFIG_ARCH_DAVINCI)		+= davinci/

drivers/media/platform/sti/delta/Makefile

+obj-$(CONFIG_VIDEO_STI_DELTA_DRIVER) := st-delta.o
+st-delta-y := delta-v4l2.o

drivers/media/platform/sti/delta/delta-cfg.h

+/*
+ * Copyright (C) STMicroelectronics SA 2015
+ * Author: Hugues Fruchet <hugues.fruchet@st.com> for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#ifndef DELTA_CFG_H
+#define DELTA_CFG_H
+
+#define DELTA_FW_VERSION "21.1-3"
+
+#define DELTA_MIN_WIDTH  32
+#define DELTA_MAX_WIDTH  4096
+#define DELTA_MIN_HEIGHT 32
+#define DELTA_MAX_HEIGHT 2400
+
+/* DELTA requires a 32x32 pixels alignment for frames */
+#define DELTA_WIDTH_ALIGNMENT    32
+#define DELTA_HEIGHT_ALIGNMENT   32
+
+#define DELTA_DEFAULT_WIDTH  DELTA_MIN_WIDTH
+#define DELTA_DEFAULT_HEIGHT DELTA_MIN_HEIGHT
+#define DELTA_DEFAULT_FRAMEFORMAT  V4L2_PIX_FMT_NV12
+#define DELTA_DEFAULT_STREAMFORMAT V4L2_PIX_FMT_MJPEG
+
+#define DELTA_MAX_RESO (DELTA_MAX_WIDTH * DELTA_MAX_HEIGHT)
+
+/* guard value for number of access units */
+#define DELTA_MAX_AUS 10
+
+/* IP perf dependent, can be tuned */
+#define DELTA_PEAK_FRAME_SMOOTHING 2
+
+/*
+ * guard output frame count:
+ * - at least 1 frame needed for display
+ * - at worst 21
+ *   ( max h264 dpb (16) +
+ *     decoding peak smoothing (2) +
+ *     user display pipeline (3) )
+ */
+#define DELTA_MIN_FRAME_USER    1
+#define DELTA_MAX_DPB           16
+#define DELTA_MAX_FRAME_USER    3 /* platform/use-case dependent */
+#define DELTA_MAX_FRAMES (DELTA_MAX_DPB + DELTA_PEAK_FRAME_SMOOTHING +\
+			  DELTA_MAX_FRAME_USER)
+
+#if DELTA_MAX_FRAMES > VIDEO_MAX_FRAME
+#undef DELTA_MAX_FRAMES
+#define DELTA_MAX_FRAMES (VIDEO_MAX_FRAME)
+#endif
+
+/* extra space to be allocated to store codec specific data per frame */
+#define DELTA_MAX_FRAME_PRIV_SIZE 100
+
+/* PM runtime auto power-off after 5ms of inactivity */
+#define DELTA_HW_AUTOSUSPEND_DELAY_MS 5
+
+#define DELTA_MAX_DECODERS 10
+
+#endif /* DELTA_CFG_H */