[PATCH v6 06/10] DMA: dmaengine: expose max burst capability to clients

Shawn Lin
2015-10-15T01:37:16Z

This patch add max_burst to dma_get_slave_caps for clients
to get the burst capability of slave dma controller.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>

---

Changes in v6:
- remove expose quirk and add dma max_burst caps for clients

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None

drivers/dma/dmaengine.c | 1 +
include/linux/dmaengine.h | 4 ++++
2 files changed, 5 insertions(+)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 3ecec14..1ccf64b 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -492,6 +492,7 @@ int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps)
caps->src_addr_widths = device->src_addr_widths;
caps->dst_addr_widths = device->dst_addr_widths;
caps->directions = device->directions;
+ caps->max_burst = device->max_burst;
caps->residue_granularity = device->residue_granularity;

/*
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 7ea9184..b6bc79e 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -401,6 +401,7 @@ enum dma_residue_granularity {
* since the enum dma_transfer_direction is not defined as bits for each
* type of direction, the dma controller should fill (1 << <TYPE>) and same
* should be checked by controller as well
+ * @max_burst: max burst capability per-transfer
* @cmd_pause: true, if pause and thereby resume is supported
* @cmd_terminate: true, if terminate cmd is supported
* @residue_granularity: granularity of the reported transfer residue
@@ -411,6 +412,7 @@ struct dma_slave_caps {
u32 src_addr_widths;
u32 dst_addr_widths;
u32 directions;
+ u32 max_burst;
bool cmd_pause;
bool cmd_terminate;
enum dma_residue_granularity residue_granularity;
@@ -627,6 +629,7 @@ enum dmaengine_alignment {
* the enum dma_transfer_direction is not defined as bits for
* each type of direction, the dma controller should fill (1 <<
* <TYPE>) and same should be checked by controller as well
+ * @max_burst: max burst capability per-transfer
* @residue_granularity: granularity of the transfer residue reported
* by tx_status
* @device_alloc_chan_resources: allocate resources and return the
@@ -680,6 +683,7 @@ struct dma_device {
u32 src_addr_widths;
u32 dst_addr_widths;
u32 directions;
+ u32 max_burst;
enum dma_residue_granularity residue_granularity;

int (*device_alloc_chan_resources)(struct dma_chan *chan);
--
2.3.7