From 939b571a3b62b64cf407fa5dbc3941bc87e0ba3b Mon Sep 17 00:00:00 2001 From: =?utf8?q?Jonas=20Dre=C3=9Fler?= Date: Wed, 3 Nov 2021 21:17:59 +0100 Subject: [PATCH] mwifiex: Add quirk to disable deep sleep with certain hardware revision MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20211103201800.13531-3-verdre@v0yd.nl --- drivers/net/wireless/marvell/mwifiex/main.c | 18 ++++++++++++++++++ drivers/net/wireless/marvell/mwifiex/main.h | 1 + drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c | 20 ++++++++++++++++++++ 3 files changed, 39 insertions(+) diff --git a/drivers/net/wireless/marvell/mwifiex/main.c b/drivers/net/wireless/marvell/mwifiex/main.c index 19b996c..ace7371 100644 --- a/drivers/net/wireless/marvell/mwifiex/main.c +++ b/drivers/net/wireless/marvell/mwifiex/main.c @@ -226,6 +226,23 @@ exit_rx_proc: return 0; } +static void maybe_quirk_fw_disable_ds(struct mwifiex_adapter *adapter) +{ + struct mwifiex_private *priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA); + struct mwifiex_ver_ext ver_ext; + + if (test_and_set_bit(MWIFIEX_IS_REQUESTING_FW_VEREXT, &adapter->work_flags)) + return; + + memset(&ver_ext, 0, sizeof(ver_ext)); + ver_ext.version_str_sel = 1; + if (mwifiex_send_cmd(priv, HostCmd_CMD_VERSION_EXT, + HostCmd_ACT_GEN_GET, 0, &ver_ext, false)) { + mwifiex_dbg(priv->adapter, MSG, + "Checking hardware revision failed.\n"); + } +} + /* * The main process. * @@ -356,6 +373,7 @@ process_start: if (adapter->hw_status == MWIFIEX_HW_STATUS_INIT_DONE) { adapter->hw_status = MWIFIEX_HW_STATUS_READY; mwifiex_init_fw_complete(adapter); + maybe_quirk_fw_disable_ds(adapter); } } diff --git a/drivers/net/wireless/marvell/mwifiex/main.h b/drivers/net/wireless/marvell/mwifiex/main.h index 65609ea..eabd0e0 100644 --- a/drivers/net/wireless/marvell/mwifiex/main.h +++ b/drivers/net/wireless/marvell/mwifiex/main.h @@ -524,6 +524,7 @@ enum mwifiex_adapter_work_flags { MWIFIEX_IS_SUSPENDED, MWIFIEX_IS_HS_CONFIGURED, MWIFIEX_IS_HS_ENABLING, + MWIFIEX_IS_REQUESTING_FW_VEREXT, }; struct mwifiex_band_config { diff --git a/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c b/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c index 20b69a3..6c7b0b9 100644 --- a/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c +++ b/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c @@ -708,6 +708,26 @@ static int mwifiex_ret_ver_ext(struct mwifiex_private *priv, { struct host_cmd_ds_version_ext *ver_ext = &resp->params.verext; + if (test_and_clear_bit(MWIFIEX_IS_REQUESTING_FW_VEREXT, &priv->adapter->work_flags)) { + if (strncmp(ver_ext->version_str, "ChipRev:20, BB:9b(10.00), RF:40(21)", + MWIFIEX_VERSION_STR_LENGTH) == 0) { + struct mwifiex_ds_auto_ds auto_ds = { + .auto_ds = DEEP_SLEEP_OFF, + }; + + mwifiex_dbg(priv->adapter, MSG, + "Bad HW revision detected, disabling deep sleep\n"); + + if (mwifiex_send_cmd(priv, HostCmd_CMD_802_11_PS_MODE_ENH, + DIS_AUTO_PS, BITMAP_AUTO_DS, &auto_ds, false)) { + mwifiex_dbg(priv->adapter, MSG, + "Disabling deep sleep failed.\n"); + } + } + + return 0; + } + if (version_ext) { version_ext->version_str_sel = ver_ext->version_str_sel; memcpy(version_ext->version_str, ver_ext->version_str, -- 2.7.4