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Subject[PATCH 2/2] dmaengine: xilinx_dma: Enable VDMA S2MM vertical flip support
Date
Vertical flip state is exported in xilinx_vdma_config and depending
on IP configuration(c_enable_vert_flip) vertical flip state is
programmed in hardware.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
drivers/dma/xilinx/xilinx_dma.c | 22 ++++++++++++++++++++++
include/linux/dma/xilinx_dma.h | 2 ++
2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index 27b5235..c124423 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -115,6 +115,9 @@
#define XILINX_VDMA_REG_START_ADDRESS(n) (0x000c + 4 * (n))
#define XILINX_VDMA_REG_START_ADDRESS_64(n) (0x000c + 8 * (n))

+#define XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP 0x00ec
+#define XILINX_VDMA_ENABLE_VERTICAL_FLIP BIT(0)
+
/* HW specific definitions */
#define XILINX_DMA_MAX_CHANS_PER_DEVICE 0x20

@@ -340,6 +343,7 @@ struct xilinx_dma_tx_descriptor {
* @start_transfer: Differentiate b/w DMA IP's transfer
* @stop_transfer: Differentiate b/w DMA IP's quiesce
* @tdest: TDEST value for mcdma
+ * @has_vflip: S2MM vertical flip
*/
struct xilinx_dma_chan {
struct xilinx_dma_device *xdev;
@@ -376,6 +380,7 @@ struct xilinx_dma_chan {
void (*start_transfer)(struct xilinx_dma_chan *chan);
int (*stop_transfer)(struct xilinx_dma_chan *chan);
u16 tdest;
+ bool has_vflip;
};

/**
@@ -1092,6 +1097,14 @@ static void xilinx_vdma_start_transfer(struct xilinx_dma_chan *chan)
desc->async_tx.phys);

/* Configure the hardware using info in the config structure */
+ if (chan->has_vflip) {
+ reg = dma_read(chan, XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP);
+ reg &= ~XILINX_VDMA_ENABLE_VERTICAL_FLIP;
+ reg |= config->vflip_en;
+ dma_write(chan, XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP,
+ reg);
+ }
+
reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);

if (config->frm_cnt_en)
@@ -2105,6 +2118,8 @@ int xilinx_vdma_channel_set_config(struct dma_chan *dchan,
}

chan->config.frm_cnt_en = cfg->frm_cnt_en;
+ chan->config.vflip_en = cfg->vflip_en;
+
if (cfg->park)
chan->config.park_frm = cfg->park_frm;
else
@@ -2428,6 +2443,13 @@ static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
chan->direction = DMA_DEV_TO_MEM;
chan->id = chan_id;
chan->tdest = chan_id - xdev->nr_channels;
+ chan->has_vflip = of_property_read_bool(node,
+ "xlnx,enable-vert-flip");
+ if (chan->has_vflip) {
+ chan->config.vflip_en = dma_read(chan,
+ XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP) &
+ XILINX_VDMA_ENABLE_VERTICAL_FLIP;
+ }

chan->ctrl_offset = XILINX_DMA_S2MM_CTRL_OFFSET;
if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
diff --git a/include/linux/dma/xilinx_dma.h b/include/linux/dma/xilinx_dma.h
index 34b98f2..5b6e61e 100644
--- a/include/linux/dma/xilinx_dma.h
+++ b/include/linux/dma/xilinx_dma.h
@@ -27,6 +27,7 @@
* @delay: Delay counter
* @reset: Reset Channel
* @ext_fsync: External Frame Sync source
+ * @vflip_en: Vertical Flip enable
*/
struct xilinx_vdma_config {
int frm_dly;
@@ -39,6 +40,7 @@ struct xilinx_vdma_config {
int delay;
int reset;
int ext_fsync;
+ bool vflip_en;
};

int xilinx_vdma_channel_set_config(struct dma_chan *dchan,
--
1.7.1
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