[PATCH v3] wifi: mwifiex: add extra delay for firmware ready

[David Lin]

For SDIO IW416, due to a bug, FW may return ready before complete
full initialization.
Command timeout may occur at driver load after reboot.
Workaround by adding 100ms delay at checking FW status.

Signed-off-by: David Lin <yu-hao.lin@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx

---

v3:
   - v2 was a not finished patch that was send to the LKML by mistake
   - changed check condition for extra delay with clear comments.
   - added flag to struct mwifiex_sdio_device / mwifiex_sdio_sd8978 to
     enable extra delay only for IW416.
---
 drivers/net/wireless/marvell/mwifiex/sdio.c | 19 +++++++++++++++++++
 drivers/net/wireless/marvell/mwifiex/sdio.h |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c
index 6462a0ffe698..ef3e68d1059c 100644
--- a/drivers/net/wireless/marvell/mwifiex/sdio.c
+++ b/drivers/net/wireless/marvell/mwifiex/sdio.c
@@ -331,6 +331,7 @@ static const struct mwifiex_sdio_device mwifiex_sdio_sd8786 = {
 	.can_dump_fw = false,
 	.can_auto_tdls = false,
 	.can_ext_scan = false,
+	.fw_ready_extra_delay = false,
 };
 
 static const struct mwifiex_sdio_device mwifiex_sdio_sd8787 = {
@@ -346,6 +347,7 @@ static const struct mwifiex_sdio_device mwifiex_sdio_sd8787 = {
 	.can_dump_fw = false,
 	.can_auto_tdls = false,
 	.can_ext_scan = true,
+	.fw_ready_extra_delay = false,
 };
 
 static const struct mwifiex_sdio_device mwifiex_sdio_sd8797 = {
@@ -361,6 +363,7 @@ static const struct mwifiex_sdio_device mwifiex_sdio_sd8797 = {
 	.can_dump_fw = false,
 	.can_auto_tdls = false,
 	.can_ext_scan = true,
+	.fw_ready_extra_delay = false,
 };
 
 static const struct mwifiex_sdio_device mwifiex_sdio_sd8897 = {
@@ -376,6 +379,7 @@ static const struct mwifiex_sdio_device mwifiex_sdio_sd8897 = {
 	.can_dump_fw = true,
 	.can_auto_tdls = false,
 	.can_ext_scan = true,
+	.fw_ready_extra_delay = false,
 };
 
 static const struct mwifiex_sdio_device mwifiex_sdio_sd8977 = {
@@ -392,6 +396,7 @@ static const struct mwifiex_sdio_device mwifiex_sdio_sd8977 = {
 	.fw_dump_enh = true,
 	.can_auto_tdls = false,
 	.can_ext_scan = true,
+	.fw_ready_extra_delay = false,
 };
 
 static const struct mwifiex_sdio_device mwifiex_sdio_sd8978 = {
@@ -408,6 +413,7 @@ static const struct mwifiex_sdio_device mwifiex_sdio_sd8978 = {
 	.fw_dump_enh = true,
 	.can_auto_tdls = false,
 	.can_ext_scan = true,
+	.fw_ready_extra_delay = true,
 };
 
 static const struct mwifiex_sdio_device mwifiex_sdio_sd8997 = {
@@ -425,6 +431,7 @@ static const struct mwifiex_sdio_device mwifiex_sdio_sd8997 = {
 	.fw_dump_enh = true,
 	.can_auto_tdls = false,
 	.can_ext_scan = true,
+	.fw_ready_extra_delay = false,
 };
 
 static const struct mwifiex_sdio_device mwifiex_sdio_sd8887 = {
@@ -440,6 +447,7 @@ static const struct mwifiex_sdio_device mwifiex_sdio_sd8887 = {
 	.can_dump_fw = false,
 	.can_auto_tdls = true,
 	.can_ext_scan = true,
+	.fw_ready_extra_delay = false,
 };
 
 static const struct mwifiex_sdio_device mwifiex_sdio_sd8987 = {
@@ -456,6 +464,7 @@ static const struct mwifiex_sdio_device mwifiex_sdio_sd8987 = {
 	.fw_dump_enh = true,
 	.can_auto_tdls = true,
 	.can_ext_scan = true,
+	.fw_ready_extra_delay = false,
 };
 
 static const struct mwifiex_sdio_device mwifiex_sdio_sd8801 = {
@@ -471,6 +480,7 @@ static const struct mwifiex_sdio_device mwifiex_sdio_sd8801 = {
 	.can_dump_fw = false,
 	.can_auto_tdls = false,
 	.can_ext_scan = true,
+	.fw_ready_extra_delay = false,
 };
 
 static struct memory_type_mapping generic_mem_type_map[] = {
@@ -563,6 +573,7 @@ mwifiex_sdio_probe(struct sdio_func *func, const struct sdio_device_id *id)
 		card->fw_dump_enh = data->fw_dump_enh;
 		card->can_auto_tdls = data->can_auto_tdls;
 		card->can_ext_scan = data->can_ext_scan;
+		card->fw_ready_extra_delay = data->fw_ready_extra_delay;
 		INIT_WORK(&card->work, mwifiex_sdio_work);
 	}
 
@@ -766,6 +777,7 @@ mwifiex_sdio_read_fw_status(struct mwifiex_adapter *adapter, u16 *dat)
 static int mwifiex_check_fw_status(struct mwifiex_adapter *adapter,
 				   u32 poll_num)
 {
+	struct sdio_mmc_card *card = adapter->card;
 	int ret = 0;
 	u16 firmware_stat;
 	u32 tries;
@@ -783,6 +795,13 @@ static int mwifiex_check_fw_status(struct mwifiex_adapter *adapter,
 		ret = -1;
 	}
 
+	if (card->fw_ready_extra_delay &&
+	    firmware_stat == FIRMWARE_READY_SDIO)
+		/* firmware might pretend to be ready, when it's not.
+		 * Wait a little bit more as a workaround.
+		 */
+		msleep(100);
+
 	return ret;
 }
 
diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.h b/drivers/net/wireless/marvell/mwifiex/sdio.h
index b86a9263a6a8..cb63ad55d675 100644
--- a/drivers/net/wireless/marvell/mwifiex/sdio.h
+++ b/drivers/net/wireless/marvell/mwifiex/sdio.h
@@ -255,6 +255,7 @@ struct sdio_mmc_card {
 	bool fw_dump_enh;
 	bool can_auto_tdls;
 	bool can_ext_scan;
+	bool fw_ready_extra_delay;
 
 	struct mwifiex_sdio_mpa_tx mpa_tx;
 	struct mwifiex_sdio_mpa_rx mpa_rx;
@@ -278,6 +279,7 @@ struct mwifiex_sdio_device {
 	bool fw_dump_enh;
 	bool can_auto_tdls;
 	bool can_ext_scan;
+	bool fw_ready_extra_delay;
 };
 
 /*

base-commit: 783004b6dbda2cfe9a552a4cc9c1d168a2068f6c
-- 
2.25.1