On 30/10/2020 22.30, Grygorii Strashko wrote:
> 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.
Is this patch on top of the AM64 (BCDMA/PKTDMA) series or not?
Will it cause any conflict?
Acked-by: Peter Ujfalusi <peter.ujfal...@ti.com>
> 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);
>
>
- Péter
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