[PATCH v2 0/2] mwifiex: Add quirk to disable deep sleep with certain hardware revision

[PATCH v2 0/2] mwifiex: Add quirk to disable deep sleep with certain hardware revision

[Jonas Dreßler]

Second revision of this patch, the first one is here:
https://lore.kernel.org/linux-wireless/20211028073729.24408-1-verdre@v0yd.nl/T/

Changes between v1 and v2:
 - Add patch to move fixed version string length (128) into a define
 - Added handling for errors in mwifiex_send_cmd()
 - Switched to test_and_set_bit() to avoid reentry in maybe_quirk_fw_disable_ds()
 - Improve commit message a bit

Jonas Dreßler (2):
  mwifiex: Use a define for firmware version string length
  mwifiex: Add quirk to disable deep sleep with certain hardware
    revision

 drivers/net/wireless/marvell/mwifiex/fw.h     |  4 +++-
 drivers/net/wireless/marvell/mwifiex/main.c   | 18 ++++++++++++++
 drivers/net/wireless/marvell/mwifiex/main.h   |  3 ++-
 .../wireless/marvell/mwifiex/sta_cmdresp.c    | 24 +++++++++++++++++--
 4 files changed, 45 insertions(+), 4 deletions(-)

-- 
2.33.1

[PATCH v2 1/2] mwifiex: Use a define for firmware version string length

[Jonas Dreßler]

Since the version string we get from the firmware is always 128
characters long, use a define for this size instead of having the number
128 copied all over the place.

Signed-off-by: Jonas Dreßler <verdre@v0yd.nl>
---
 drivers/net/wireless/marvell/mwifiex/fw.h          | 4 +++-
 drivers/net/wireless/marvell/mwifiex/main.h        | 2 +-
 drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c | 4 ++--
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/fw.h b/drivers/net/wireless/marvell/mwifiex/fw.h
index 2ff23ab259ab..63c25c69ed2b 100644
--- a/drivers/net/wireless/marvell/mwifiex/fw.h
+++ b/drivers/net/wireless/marvell/mwifiex/fw.h
@@ -2071,9 +2071,11 @@ struct mwifiex_ie_types_robust_coex {
 	__le32 mode;
 } __packed;
 
+#define MWIFIEX_VERSION_STR_LENGTH  128
+
 struct host_cmd_ds_version_ext {
 	u8 version_str_sel;
-	char version_str[128];
+	char version_str[MWIFIEX_VERSION_STR_LENGTH];
 } __packed;
 
 struct host_cmd_ds_mgmt_frame_reg {
diff --git a/drivers/net/wireless/marvell/mwifiex/main.h b/drivers/net/wireless/marvell/mwifiex/main.h
index 90012cbcfd15..65609ea2327e 100644
--- a/drivers/net/wireless/marvell/mwifiex/main.h
+++ b/drivers/net/wireless/marvell/mwifiex/main.h
@@ -646,7 +646,7 @@ struct mwifiex_private {
 	struct wireless_dev wdev;
 	struct mwifiex_chan_freq_power cfp;
 	u32 versionstrsel;
-	char version_str[128];
+	char version_str[MWIFIEX_VERSION_STR_LENGTH];
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *dfs_dev_dir;
 #endif
diff --git a/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c b/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c
index 6b5d35d9e69f..1bc2a1f78f96 100644
--- a/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c
+++ b/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c
@@ -711,8 +711,8 @@ static int mwifiex_ret_ver_ext(struct mwifiex_private *priv,
 	if (version_ext) {
 		version_ext->version_str_sel = ver_ext->version_str_sel;
 		memcpy(version_ext->version_str, ver_ext->version_str,
-		       sizeof(char) * 128);
-		memcpy(priv->version_str, ver_ext->version_str, 128);
+		       sizeof(char) * MWIFIEX_VERSION_STR_LENGTH);
+		memcpy(priv->version_str, ver_ext->version_str, MWIFIEX_VERSION_STR_LENGTH);
 	}
 	return 0;
 }
-- 
2.33.1

[PATCH v2 2/2] mwifiex: Add quirk to disable deep sleep with certain hardware revision

[Jonas Dreßler]

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>
---
 drivers/net/wireless/marvell/mwifiex/main.c   | 18 +++++++++++++++++
 drivers/net/wireless/marvell/mwifiex/main.h   |  1 +
 .../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 19b996c6a260..ace7371c4773 100644
--- a/drivers/net/wireless/marvell/mwifiex/main.c
+++ b/drivers/net/wireless/marvell/mwifiex/main.c
@@ -226,6 +226,23 @@ static int mwifiex_process_rx(struct mwifiex_adapter *adapter)
 	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 @@ int mwifiex_main_process(struct mwifiex_adapter *adapter)
 			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 65609ea2327e..eabd0e0a9f56 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 1bc2a1f78f96..05c38fd90c3c 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,
-- 
2.33.1

Re: [PATCH v2 1/2] mwifiex: Use a define for firmware version string length

[Andy Shevchenko]

On Wed, Nov 03, 2021 at 02:55:28PM +0100, Jonas Dreßler wrote:
> Since the version string we get from the firmware is always 128
> characters long, use a define for this size instead of having the number
> 128 copied all over the place.

Just answered to the previous one :-) Okay, you may ignore that thread
since you did what you and I were talking about.

...

> +		       sizeof(char) * MWIFIEX_VERSION_STR_LENGTH);

While at it, drop the redundant sizeof().

-- 
With Best Regards,
Andy Shevchenko