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dmaengine: ti: k3-udma-glue: move psi-l pairing in channel en/dis functions

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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.strashko@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20201030203000.4281-1-grygorii.strashko@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Grygorii Strashko 2020-10-30 22:30:00 +02:00 committed by Vinod Koul
parent 6349753276
commit 69973b4895
1 changed files with 38 additions and 26 deletions
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64
drivers/dma/ti/k3-udma-glue.c
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@ -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);