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mwifiex: use pci_dma_sync_single* APIs 

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@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Amitkumar Karwar 2017-01-24 19:05:45 +05:30 committed by Kalle Valo
parent 3e66849865
commit cc37d8efd2
1 changed files with 10 additions and 1 deletions
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11
drivers/net/wireless/marvell/mwifiex/pcie.c
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@ -439,9 +439,14 @@ static void mwifiex_delay_for_sleep_cookie(struct mwifiex_adapter *adapter,
struct pcie_service_card *card = adapter->card; struct pcie_service_card *card = adapter->card;
u8 *buffer; u8 *buffer;
u32 sleep_cookie, count; u32 sleep_cookie, count;
struct sk_buff *cmdrsp = card->cmdrsp_buf;
for (count = 0; count < max_delay_loop_cnt; count++) { 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); sleep_cookie = READ_ONCE(*(u32 *)buffer);
if (sleep_cookie == MWIFIEX_DEF_SLEEP_COOKIE) { 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); "sleep cookie found at count %d\n", count);
break; break;
} }
pci_dma_sync_single_for_device(card->dev,
MWIFIEX_SKB_DMA_ADDR(cmdrsp),
sizeof(sleep_cookie),
PCI_DMA_FROMDEVICE);
usleep_range(20, 30); usleep_range(20, 30);
} }