Depending on system factors (e.g., the PCIe link PM state), the first
read to wake up the Wifi firmware can take a long time. There is no
reason to use a (blocking, non-posted) read at this point, so let's just
use a write instead. Write vs. read doesn't matter functionality-wise --
it's just a dummy operation.
This has been shown to decrease the time spent blocking in this function
on a Rockchip RK3399 SoC.
Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx>
---
drivers/net/wireless/marvell/mwifiex/pcie.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c
index 66226c615be0..435ba879ef29 100644
--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
+++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
@@ -458,7 +458,6 @@ static void mwifiex_delay_for_sleep_cookie(struct mwifiex_adapter *adapter,
/* This function wakes up the card by reading fw_status register. */
static int mwifiex_pm_wakeup_card(struct mwifiex_adapter *adapter)
{
- u32 fw_status;
struct pcie_service_card *card = adapter->card;
const struct mwifiex_pcie_card_reg *reg = card->pcie.reg;
@@ -468,10 +467,10 @@ static int mwifiex_pm_wakeup_card(struct mwifiex_adapter *adapter)
if (reg->sleep_cookie)
mwifiex_pcie_dev_wakeup_delay(adapter);
- /* Reading fw_status register will wakeup device */
- if (mwifiex_read_reg(adapter, reg->fw_status, &fw_status)) {
+ /* Accessing fw_status register will wakeup device */
+ if (mwifiex_write_reg(adapter, reg->fw_status, 0)) {
mwifiex_dbg(adapter, ERROR,
- "Reading fw_status register failed\n");
+ "Writing fw_status register failed\n");
return -1;
}
--
2.11.0.390.gc69c2f50cf-goog
