On some platforms, driver is unable read sleep cookie signature even
if firmware has written it through DMA. The problem is fixed by using
pci_dma_sync_single* APIs while reading DMA buffer shared with firmware.
Signed-off-by: Amitkumar Karwar <akarwar@xxxxxxxxxxx>
---
drivers/net/wireless/marvell/mwifiex/pcie.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c
index 3f4ca28..a0d9180 100644
--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
+++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
@@ -439,9 +439,14 @@ static void mwifiex_delay_for_sleep_cookie(struct mwifiex_adapter *adapter,
struct pcie_service_card *card = adapter->card;
u8 *buffer;
u32 sleep_cookie, count;
+ struct sk_buff *cmdrsp = card->cmdrsp_buf;
for (count = 0; count < max_delay_loop_cnt; count++) {
- buffer = card->cmdrsp_buf->data;
+ pci_dma_sync_single_for_cpu(card->dev,
+ MWIFIEX_SKB_DMA_ADDR(cmdrsp),
+ sizeof(sleep_cookie),
+ PCI_DMA_FROMDEVICE);
+ buffer = cmdrsp->data;
sleep_cookie = READ_ONCE(*(u32 *)buffer);
if (sleep_cookie == MWIFIEX_DEF_SLEEP_COOKIE) {
@@ -449,6 +454,10 @@ static void mwifiex_delay_for_sleep_cookie(struct mwifiex_adapter *adapter,
"sleep cookie found at count %d\n", count);
break;
}
+ pci_dma_sync_single_for_device(card->dev,
+ MWIFIEX_SKB_DMA_ADDR(cmdrsp),
+ sizeof(sleep_cookie),
+ PCI_DMA_FROMDEVICE);
usleep_range(20, 30);
}
--
1.9.1
