The NAVSS UDMA will stuck if target IP module is disabled by PM while PSI-L
threads are paired UDMA<->IP and no further transfers is possible. This
could be the case for IPs J721E Main CPSW (cpsw9g).
Hence, to avoid such situation do PSI-L threads pairing only when UDMA
channel is going to be enabled as at this time DMA consumer module expected
to be active already.
Signed-off-by: Grygorii Strashko <grygorii.stras...@ti.com>
---
drivers/dma/ti/k3-udma-glue.c | 64 +++++++++++++++++++++--------------
1 file changed, 38 insertions(+), 26 deletions(-)
diff --git a/drivers/dma/ti/k3-udma-glue.c b/drivers/dma/ti/k3-udma-glue.c
index a367584f0d7b..dfb65e382ab9 100644
--- a/drivers/dma/ti/k3-udma-glue.c
+++ b/drivers/dma/ti/k3-udma-glue.c
@@ -303,19 +303,6 @@ struct k3_udma_glue_tx_channel
*k3_udma_glue_request_tx_chn(struct device *dev,
goto err;
}
- ret = xudma_navss_psil_pair(tx_chn->common.udmax,
- tx_chn->common.src_thread,
- tx_chn->common.dst_thread);
- if (ret) {
- dev_err(dev, "PSI-L request err %d\n", ret);
- goto err;
- }
-
- tx_chn->psil_paired = true;
-
- /* reset TX RT registers */
- k3_udma_glue_disable_tx_chn(tx_chn);
-
k3_udma_glue_dump_tx_chn(tx_chn);
return tx_chn;
@@ -378,6 +365,18 @@ EXPORT_SYMBOL_GPL(k3_udma_glue_pop_tx_chn);
int k3_udma_glue_enable_tx_chn(struct k3_udma_glue_tx_channel *tx_chn)
{
+ int ret;
+
+ ret = xudma_navss_psil_pair(tx_chn->common.udmax,
+ tx_chn->common.src_thread,
+ tx_chn->common.dst_thread);
+ if (ret) {
+ dev_err(tx_chn->common.dev, "PSI-L request err %d\n", ret);
+ return ret;
+ }
+
+ tx_chn->psil_paired = true;
+
xudma_tchanrt_write(tx_chn->udma_tchanx, UDMA_CHAN_RT_PEER_RT_EN_REG,
UDMA_PEER_RT_EN_ENABLE);
@@ -398,6 +397,13 @@ void k3_udma_glue_disable_tx_chn(struct
k3_udma_glue_tx_channel *tx_chn)
xudma_tchanrt_write(tx_chn->udma_tchanx,
UDMA_CHAN_RT_PEER_RT_EN_REG, 0);
k3_udma_glue_dump_tx_rt_chn(tx_chn, "txchn dis2");
+
+ if (tx_chn->psil_paired) {
+ xudma_navss_psil_unpair(tx_chn->common.udmax,
+ tx_chn->common.src_thread,
+ tx_chn->common.dst_thread);
+ tx_chn->psil_paired = false;
+ }
}
EXPORT_SYMBOL_GPL(k3_udma_glue_disable_tx_chn);
@@ -815,19 +821,6 @@ k3_udma_glue_request_rx_chn_priv(struct device *dev, const
char *name,
goto err;
}
- ret = xudma_navss_psil_pair(rx_chn->common.udmax,
- rx_chn->common.src_thread,
- rx_chn->common.dst_thread);
- if (ret) {
- dev_err(dev, "PSI-L request err %d\n", ret);
- goto err;
- }
-
- rx_chn->psil_paired = true;
-
- /* reset RX RT registers */
- k3_udma_glue_disable_rx_chn(rx_chn);
-
k3_udma_glue_dump_rx_chn(rx_chn);
return rx_chn;
@@ -1052,12 +1045,24 @@ EXPORT_SYMBOL_GPL(k3_udma_glue_rx_flow_disable);
int k3_udma_glue_enable_rx_chn(struct k3_udma_glue_rx_channel *rx_chn)
{
+ int ret;
+
if (rx_chn->remote)
return -EINVAL;
if (rx_chn->flows_ready < rx_chn->flow_num)
return -EINVAL;
+ ret = xudma_navss_psil_pair(rx_chn->common.udmax,
+ rx_chn->common.src_thread,
+ rx_chn->common.dst_thread);
+ if (ret) {
+ dev_err(rx_chn->common.dev, "PSI-L request err %d\n", ret);
+ return ret;
+ }
+
+ rx_chn->psil_paired = true;
+
xudma_rchanrt_write(rx_chn->udma_rchanx, UDMA_CHAN_RT_CTL_REG,
UDMA_CHAN_RT_CTL_EN);
@@ -1078,6 +1083,13 @@ void k3_udma_glue_disable_rx_chn(struct
k3_udma_glue_rx_channel *rx_chn)
xudma_rchanrt_write(rx_chn->udma_rchanx, UDMA_CHAN_RT_CTL_REG, 0);
k3_udma_glue_dump_rx_rt_chn(rx_chn, "rxrt dis2");
+
+ if (rx_chn->psil_paired) {
+ xudma_navss_psil_unpair(rx_chn->common.udmax,
+ rx_chn->common.src_thread,
+ rx_chn->common.dst_thread);
+ rx_chn->psil_paired = false;
+ }
}
EXPORT_SYMBOL_GPL(k3_udma_glue_disable_rx_chn);
--
2.17.1
