net: ethernet: ti: am65-cpsw-nuss: cleanup DMA Channels before using them

[ Upstream commit c24cd679b075b0e953ea167b0aa2b2d59e4eba7f ]

The TX and RX DMA Channels used by the driver to exchange data with CPSW
are not guaranteed to be in a clean state during driver initialization.
The Bootloader could have used the same DMA Channels without cleaning them
up in the event of failure. Thus, reset and disable the DMA Channels to
ensure that they are in a clean state before using them.

Fixes: 93a76530316a ("net: ethernet: ti: introduce am65x/j721e gigabit eth subsystem driver")
Reported-by: Schuyler Patton <spatton@ti.com>
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Link: https://lore.kernel.org/r/20240417095425.2253876-1-s-vadapalli@ti.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index c62b0f99f2bc4d5fdd6012729f6160d62f0c7c5f..d556e705ec000d0bd6280aba1909d3566c464f0c 100644 (file)
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -2716,6 +2716,8 @@ static void am65_cpsw_unregister_devlink(struct am65_cpsw_common *common)
 
 static int am65_cpsw_nuss_register_ndevs(struct am65_cpsw_common *common)
 {
+       struct am65_cpsw_rx_chn *rx_chan = &common->rx_chns;
+       struct am65_cpsw_tx_chn *tx_chan = common->tx_chns;
        struct device *dev = common->dev;
        struct am65_cpsw_port *port;
        int ret = 0, i;
@@ -2728,6 +2730,22 @@ static int am65_cpsw_nuss_register_ndevs(struct am65_cpsw_common *common)
        if (ret)
                return ret;
 
+       /* The DMA Channels are not guaranteed to be in a clean state.
+        * Reset and disable them to ensure that they are back to the
+        * clean state and ready to be used.
+        */
+       for (i = 0; i < common->tx_ch_num; i++) {
+               k3_udma_glue_reset_tx_chn(tx_chan[i].tx_chn, &tx_chan[i],
+                                         am65_cpsw_nuss_tx_cleanup);
+               k3_udma_glue_disable_tx_chn(tx_chan[i].tx_chn);
+       }
+
+       for (i = 0; i < AM65_CPSW_MAX_RX_FLOWS; i++)
+               k3_udma_glue_reset_rx_chn(rx_chan->rx_chn, i, rx_chan,
+                                         am65_cpsw_nuss_rx_cleanup, !!i);
+
+       k3_udma_glue_disable_rx_chn(rx_chan->rx_chn);
+
        ret = am65_cpsw_nuss_register_devlink(common);
        if (ret)
                return ret;