@@ -139,6 +139,8 @@ struct cppi41_dd {
struct chan_queues td_queue;
u16 first_completion_queue;
u16 qmgr_num_pend;
+ u32 n_chans;
+ u8 platform;
struct list_head pending; /* Pending queued transfers */
spinlock_t lock; /* Lock for pending list */
@@ -742,13 +744,8 @@ static int cppi41_add_chans(struct device *dev, struct cppi41_dd *cdd)
{
struct cppi41_channel *cchan;
int i;
- int ret;
- u32 n_chans;
+ u32 n_chans = cdd->n_chans;
- ret = of_property_read_u32(dev->of_node, "#dma-channels",
- &n_chans);
- if (ret)
- return ret;
/*
* The channels can only be used as TX or as RX. So we add twice
* that much dma channels because USB can only do RX or TX.
@@ -862,7 +859,7 @@ static void init_sched(struct cppi41_dd *cdd)
word = 0;
cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL);
- for (ch = 0; ch < 15 * 2; ch += 2) {
+ for (ch = 0; ch < cdd->n_chans; ch += 2) {
reg = SCHED_ENTRY0_CHAN(ch);
reg |= SCHED_ENTRY1_CHAN(ch) | SCHED_ENTRY1_IS_RX;
@@ -872,7 +869,7 @@ static void init_sched(struct cppi41_dd *cdd)
cppi_writel(reg, cdd->sched_mem + DMA_SCHED_WORD(word));
word++;
}
- reg = 15 * 2 * 2 - 1;
+ reg = cdd->n_chans * 2 - 1;
reg |= DMA_SCHED_CTRL_EN;
cppi_writel(reg, cdd->sched_mem + DMA_SCHED_CTRL);
}
@@ -897,6 +894,7 @@ static int init_cppi41(struct device *dev, struct cppi41_dd *cdd)
cppi_writel(cdd->td_queue.submit, cdd->ctrl_mem + DMA_TDFDQ);
init_sched(cdd);
+
return 0;
err_td:
deinit_cppi41(dev, cdd);
@@ -1058,6 +1056,11 @@ static int cppi41_dma_probe(struct platform_device *pdev)
cdd->qmgr_num_pend = glue_info->qmgr_num_pend;
cdd->first_completion_queue = glue_info->first_completion_queue;
+ ret = of_property_read_u32(dev->of_node,
+ "#dma-channels", &cdd->n_chans);
+ if (ret)
+ goto err_get_n_chans;
+
ret = init_cppi41(dev, cdd);
if (ret)
goto err_init_cppi;
@@ -1100,6 +1103,7 @@ static int cppi41_dma_probe(struct platform_device *pdev)
deinit_cppi41(dev, cdd);
err_init_cppi:
pm_runtime_dont_use_autosuspend(dev);
+err_get_n_chans:
err_get_sync:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
Despite the driver is already using DT to get the number of channels, init_sched() is using an hardcoded value to get it. Use DT to get the number of channels. Signed-off-by: Alexandre Bailon <abailon@baylibre.com> --- drivers/dma/cppi41.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-)