Ignore the direction argument in dma_slave_config, and configure both
directions independently. We still check that the configuration for
the intended direction is valid; this check will eventually be dropped.
This check is just for debugging at present.
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
---
drivers/dma/amba-pl08x.c | 56 ++++++++++++++-------------------------------
1 files changed, 18 insertions(+), 38 deletions(-)
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index fde801f..50b9a83 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -218,8 +218,6 @@ enum pl08x_dma_chan_state {
* @name: name of channel
* @cd: channel platform data
* @runtime_addr: address for RX/TX according to the runtime config
- * @runtime_direction: current direction of this channel according to
- * runtime config
* @pend_list: queued transactions pending on this channel
* @at: active transaction on this channel
* @lock: a lock for this channel data
@@ -239,7 +237,6 @@ struct pl08x_dma_chan {
struct dma_slave_config cfg;
u32 src_cctl;
u32 dst_cctl;
- enum dma_transfer_direction runtime_direction;
struct list_head pend_list;
struct pl08x_txd *at;
spinlock_t lock;
@@ -1239,50 +1236,31 @@ static int dma_set_runtime_config(struct dma_chan *chan,
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
- enum dma_slave_buswidth addr_width;
- u32 maxburst, cctl = 0;
+ u32 src_cctl, dst_cctl;
if (!plchan->slave)
return -EINVAL;
- /* Transfer direction */
- plchan->runtime_direction = config->direction;
- if (config->direction == DMA_MEM_TO_DEV) {
- addr_width = config->dst_addr_width;
- maxburst = config->dst_maxburst;
- } else if (config->direction == DMA_DEV_TO_MEM) {
- addr_width = config->src_addr_width;
- maxburst = config->src_maxburst;
- } else {
+ dst_cctl = pl08x_get_cctl(plchan, config->dst_addr_width,
+ config->dst_maxburst);
+ if (dst_cctl == ~0 && config->direction == DMA_MEM_TO_DEV) {
dev_err(&pl08x->adev->dev,
- "bad runtime_config: alien transfer direction\n");
+ "bad runtime_config: alien address width (M2D)\n");
return -EINVAL;
}
- cctl = pl08x_get_cctl(plchan, addr_width, maxburst);
- if (cctl == ~0) {
+ src_cctl = pl08x_get_cctl(plchan, config->src_addr_width,
+ config->src_maxburst);
+ if (src_cctl == ~0 && config->direction == DMA_DEV_TO_MEM) {
dev_err(&pl08x->adev->dev,
- "bad runtime_config: alien address width\n");
+ "bad runtime_config: alien address width (D2M)\n");
return -EINVAL;
}
+ plchan->dst_cctl = dst_cctl;
+ plchan->src_cctl = src_cctl;
plchan->cfg = *config;
- if (plchan->runtime_direction == DMA_DEV_TO_MEM) {
- plchan->src_cctl = cctl;
- } else {
- plchan->dst_cctl = cctl;
- }
-
- dev_dbg(&pl08x->adev->dev,
- "configured channel %s (%s) for %s, data width %d, "
- "maxburst %d words, LE, CCTL=0x%08x\n",
- dma_chan_name(chan), plchan->name,
- (config->direction == DMA_DEV_TO_MEM) ? "RX" : "TX",
- addr_width,
- maxburst,
- cctl);
-
return 0;
}
@@ -1470,11 +1448,6 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
return NULL;
}
- if (direction != plchan->runtime_direction)
- dev_err(&pl08x->adev->dev, "%s DMA setup does not match "
- "the direction configured for the PrimeCell\n",
- __func__);
-
/*
* Set up addresses, the PrimeCell configured address
* will take precedence since this may configure the
@@ -1499,6 +1472,13 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
return NULL;
}
+ if (cctl == ~0) {
+ pl08x_free_txd(pl08x, txd);
+ dev_err(&pl08x->adev->dev,
+ "DMA slave configuration botched?\n");
+ return NULL;
+ }
+
txd->cctl = cctl | pl08x_select_bus(src_buses, dst_buses);
if (plchan->cfg.device_fc)
--
1.7.4.4
--
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