dmaengine: core: expose max burst capability to clients

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>
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index c50a247be2e0365d4cac7ccc8ce6bbb33f671354..0cb259c59916ac0cadd4a3c3f7e5d4ae7fa2a1d8 100644 (file)
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -496,6 +496,7 @@ 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;
        caps->descriptor_reuse = device->descriptor_reuse;
 

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 16a1cad30c337369e62efab4a808397853d7b26a..0a9a0ba1998b01b97304322151cd24a42e2f8e57 100644 (file)
--- 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;
@@ -654,6 +656,7 @@ struct dma_filter {
  *     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
@@ -712,6 +715,7 @@ struct dma_device {
        u32 src_addr_widths;
        u32 dst_addr_widths;
        u32 directions;
+       u32 max_burst;
        bool descriptor_reuse;
        enum dma_residue_granularity residue_granularity;