This is a note to let you know that I've just added the patch titled
net: ethernet: ti: am65-cpsw: Add RX DMA Channel Teardown Quirk
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-ethernet-ti-am65-cpsw-add-rx-dma-channel-teardown-quirk.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0ed577e7e8e508c24e22ba07713ecc4903e147c3 Mon Sep 17 00:00:00 2001
From: Siddharth Vadapalli <s-vadapalli@xxxxxx>
Date: Thu, 9 Feb 2023 14:14:32 +0530
Subject: net: ethernet: ti: am65-cpsw: Add RX DMA Channel Teardown Quirk
From: Siddharth Vadapalli <s-vadapalli@xxxxxx>
commit 0ed577e7e8e508c24e22ba07713ecc4903e147c3 upstream.
In TI's AM62x/AM64x SoCs, successful teardown of RX DMA Channel raises an
interrupt. The process of servicing this interrupt involves flushing all
pending RX DMA descriptors and clearing the teardown completion marker
(TDCM). The am65_cpsw_nuss_rx_packets() function invoked from the RX
NAPI callback services the interrupt. Thus, it is necessary to wait for
this handler to run, drain all packets and clear TDCM, before calling
napi_disable() in am65_cpsw_nuss_common_stop() function post channel
teardown. If napi_disable() executes before ensuring that TDCM is
cleared, the TDCM remains set when the interfaces are down, resulting in
an interrupt storm when the interfaces are brought up again.
Since the interrupt raised to indicate the RX DMA Channel teardown is
specific to the AM62x and AM64x SoCs, add a quirk for it.
Fixes: 4f7cce272403 ("net: ethernet: ti: am65-cpsw: add support for am64x cpsw3g")
Co-developed-by: Vignesh Raghavendra <vigneshr@xxxxxx>
Signed-off-by: Vignesh Raghavendra <vigneshr@xxxxxx>
Signed-off-by: Siddharth Vadapalli <s-vadapalli@xxxxxx>
Reviewed-by: Roger Quadros <rogerq@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230209084432.189222-1-s-vadapalli@xxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/ti/am65-cpsw-nuss.c | 12 +++++++++++-
drivers/net/ethernet/ti/am65-cpsw-nuss.h | 1 +
2 files changed, 12 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -500,7 +500,15 @@ static int am65_cpsw_nuss_common_stop(st
k3_udma_glue_disable_tx_chn(common->tx_chns[i].tx_chn);
}
+ reinit_completion(&common->tdown_complete);
k3_udma_glue_tdown_rx_chn(common->rx_chns.rx_chn, true);
+
+ if (common->pdata.quirks & AM64_CPSW_QUIRK_DMA_RX_TDOWN_IRQ) {
+ i = wait_for_completion_timeout(&common->tdown_complete, msecs_to_jiffies(1000));
+ if (!i)
+ dev_err(common->dev, "rx teardown timeout\n");
+ }
+
napi_disable(&common->napi_rx);
for (i = 0; i < AM65_CPSW_MAX_RX_FLOWS; i++)
@@ -704,6 +712,8 @@ static int am65_cpsw_nuss_rx_packets(str
if (cppi5_desc_is_tdcm(desc_dma)) {
dev_dbg(dev, "%s RX tdown flow: %u\n", __func__, flow_idx);
+ if (common->pdata.quirks & AM64_CPSW_QUIRK_DMA_RX_TDOWN_IRQ)
+ complete(&common->tdown_complete);
return 0;
}
@@ -2634,7 +2644,7 @@ static const struct am65_cpsw_pdata j721
};
static const struct am65_cpsw_pdata am64x_cpswxg_pdata = {
- .quirks = 0,
+ .quirks = AM64_CPSW_QUIRK_DMA_RX_TDOWN_IRQ,
.ale_dev_id = "am64-cpswxg",
.fdqring_mode = K3_RINGACC_RING_MODE_RING,
};
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.h
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.h
@@ -86,6 +86,7 @@ struct am65_cpsw_rx_chn {
};
#define AM65_CPSW_QUIRK_I2027_NO_TX_CSUM BIT(0)
+#define AM64_CPSW_QUIRK_DMA_RX_TDOWN_IRQ BIT(1)
struct am65_cpsw_pdata {
u32 quirks;
Patches currently in stable-queue which might be from s-vadapalli@xxxxxx are
queue-6.1/net-ethernet-ti-am65-cpsw-add-rx-dma-channel-teardown-quirk.patch
