| Message ID | 20211011133224.15561-2-verdre@v0yd.nl (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | mwifiex: Work around firmware bugs on 88W8897 chip | expand |
Jonas Dreßler <verdre@v0yd.nl> wrote: > On the 88W8897 PCIe+USB card the firmware randomly crashes after setting > the TX ring write pointer. The issue is present in the latest firmware > version 15.68.19.p21 of the PCIe+USB card. > > Those firmware crashes can be worked around by reading any PCI register > of the card after setting that register, so read the PCI_VENDOR_ID > register here. The reason this works is probably because we keep the bus > from entering an ASPM state for a bit longer, because that's what causes > the cards firmware to crash. > > This fixes a bug where during RX/TX traffic and with ASPM L1 substates > enabled (the specific substates where the issue happens appear to be > platform dependent), the firmware crashes and eventually a command > timeout appears in the logs. > > BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=109681 > Cc: stable@vger.kernel.org > Signed-off-by: Jonas Dreßler <verdre@v0yd.nl> 2 patches applied to wireless-drivers-next.git, thanks. e5f4eb8223aa mwifiex: Read a PCI register after writing the TX ring write pointer 8e3e59c31fea mwifiex: Try waking the firmware until we get an interrupt
diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c index c6ccce426b49..641fa539de1f 100644 --- a/drivers/net/wireless/marvell/mwifiex/pcie.c +++ b/drivers/net/wireless/marvell/mwifiex/pcie.c @@ -1490,6 +1490,14 @@ mwifiex_pcie_send_data(struct mwifiex_adapter *adapter, struct sk_buff *skb, ret = -1; goto done_unmap; } + + /* The firmware (latest version 15.68.19.p21) of the 88W8897 PCIe+USB card + * seems to crash randomly after setting the TX ring write pointer when + * ASPM powersaving is enabled. A workaround seems to be keeping the bus + * busy by reading a random register afterwards. + */ + mwifiex_read_reg(adapter, PCI_VENDOR_ID, &rx_val); + if ((mwifiex_pcie_txbd_not_full(card)) && tx_param->next_pkt_len) { /* have more packets and TxBD still can hold more */
On the 88W8897 PCIe+USB card the firmware randomly crashes after setting the TX ring write pointer. The issue is present in the latest firmware version 15.68.19.p21 of the PCIe+USB card. Those firmware crashes can be worked around by reading any PCI register of the card after setting that register, so read the PCI_VENDOR_ID register here. The reason this works is probably because we keep the bus from entering an ASPM state for a bit longer, because that's what causes the cards firmware to crash. This fixes a bug where during RX/TX traffic and with ASPM L1 substates enabled (the specific substates where the issue happens appear to be platform dependent), the firmware crashes and eventually a command timeout appears in the logs. BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=109681 Cc: stable@vger.kernel.org Signed-off-by: Jonas Dreßler <verdre@v0yd.nl> --- drivers/net/wireless/marvell/mwifiex/pcie.c | 8 ++++++++ 1 file changed, 8 insertions(+)