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mwifiex: Add quirk to disable deep sleep with certain hardware revision
The 88W8897 PCIe+USB card in the hardware revision 20 apparently has a hardware issue where the card wakes up from deep sleep randomly and very often, somewhat depending on the card activity, maybe the hardware has a floating wakeup pin or something. This was found by comparing two MS Surface Book 2 devices, where one devices wifi card experienced spurious wakeups, while the other one didn't. Those continuous wakeups prevent the card from entering host sleep when the computer suspends. And because the host won't answer to events from the card anymore while it's suspended, the firmwares internal power saving state machine seems to get confused and the card can't sleep anymore at all after that. Since we can't work around that hardware bug in the firmware, let's get the hardware revision string from the firmware and match it with known bad revisions. Then disable auto deep sleep for those revisions, which makes sure we no longer get those spurious wakeups. Signed-off-by: Jonas Dreßler <verdre@v0yd.nl> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/20211103201800.13531-3-verdre@v0yd.nl
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3 changed files with 39 additions and 0 deletions
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@ -226,6 +226,23 @@ static int mwifiex_process_rx(struct mwifiex_adapter *adapter)
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return 0;
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}
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static void maybe_quirk_fw_disable_ds(struct mwifiex_adapter *adapter)
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{
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struct mwifiex_private *priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA);
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struct mwifiex_ver_ext ver_ext;
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if (test_and_set_bit(MWIFIEX_IS_REQUESTING_FW_VEREXT, &adapter->work_flags))
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return;
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memset(&ver_ext, 0, sizeof(ver_ext));
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ver_ext.version_str_sel = 1;
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if (mwifiex_send_cmd(priv, HostCmd_CMD_VERSION_EXT,
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HostCmd_ACT_GEN_GET, 0, &ver_ext, false)) {
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mwifiex_dbg(priv->adapter, MSG,
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"Checking hardware revision failed.\n");
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}
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}
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/*
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* The main process.
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*
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@ -356,6 +373,7 @@ int mwifiex_main_process(struct mwifiex_adapter *adapter)
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if (adapter->hw_status == MWIFIEX_HW_STATUS_INIT_DONE) {
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adapter->hw_status = MWIFIEX_HW_STATUS_READY;
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mwifiex_init_fw_complete(adapter);
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maybe_quirk_fw_disable_ds(adapter);
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}
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}
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@ -524,6 +524,7 @@ enum mwifiex_adapter_work_flags {
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MWIFIEX_IS_SUSPENDED,
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MWIFIEX_IS_HS_CONFIGURED,
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MWIFIEX_IS_HS_ENABLING,
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MWIFIEX_IS_REQUESTING_FW_VEREXT,
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};
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struct mwifiex_band_config {
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@ -708,6 +708,26 @@ static int mwifiex_ret_ver_ext(struct mwifiex_private *priv,
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{
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struct host_cmd_ds_version_ext *ver_ext = &resp->params.verext;
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if (test_and_clear_bit(MWIFIEX_IS_REQUESTING_FW_VEREXT, &priv->adapter->work_flags)) {
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if (strncmp(ver_ext->version_str, "ChipRev:20, BB:9b(10.00), RF:40(21)",
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MWIFIEX_VERSION_STR_LENGTH) == 0) {
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struct mwifiex_ds_auto_ds auto_ds = {
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.auto_ds = DEEP_SLEEP_OFF,
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};
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mwifiex_dbg(priv->adapter, MSG,
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"Bad HW revision detected, disabling deep sleep\n");
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if (mwifiex_send_cmd(priv, HostCmd_CMD_802_11_PS_MODE_ENH,
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DIS_AUTO_PS, BITMAP_AUTO_DS, &auto_ds, false)) {
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mwifiex_dbg(priv->adapter, MSG,
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"Disabling deep sleep failed.\n");
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}
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}
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return 0;
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}
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if (version_ext) {
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version_ext->version_str_sel = ver_ext->version_str_sel;
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memcpy(version_ext->version_str, ver_ext->version_str,
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