Return-path: Received: from mx0b-0016f401.pphosted.com ([67.231.156.173]:14991 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752986AbaCSFTc (ORCPT ); Wed, 19 Mar 2014 01:19:32 -0400 From: Bing Zhao To: CC: "John W. Linville" , Amitkumar Karwar , Avinash Patil , Maithili Hinge , Xinming Hu , Bing Zhao Subject: [PATCH] mwifiex: add support for sleep cookie in PCIe Date: Tue, 18 Mar 2014 22:19:17 -0700 Message-ID: <1395206358-11573-2-git-send-email-bzhao@marvell.com> (sfid-20140319_061934_846388_4240B482) In-Reply-To: <1395206358-11573-1-git-send-email-bzhao@marvell.com> References: <1395206358-11573-1-git-send-email-bzhao@marvell.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Avinash Patil This patch adds support to read sleep cookie for command response before accessing buffer. Signed-off-by: Avinash Patil Signed-off-by: Bing Zhao --- drivers/net/wireless/mwifiex/pcie.c | 26 ++++++++++++++++++++++++++ drivers/net/wireless/mwifiex/pcie.h | 2 ++ 2 files changed, 28 insertions(+) diff --git a/drivers/net/wireless/mwifiex/pcie.c b/drivers/net/wireless/mwifiex/pcie.c index 9f1683b..57c353a 100644 --- a/drivers/net/wireless/mwifiex/pcie.c +++ b/drivers/net/wireless/mwifiex/pcie.c @@ -327,6 +327,30 @@ static void mwifiex_pcie_dev_wakeup_delay(struct mwifiex_adapter *adapter) return; } +static void mwifiex_delay_for_sleep_cookie(struct mwifiex_adapter *adapter, + u32 max_delay_loop_cnt) +{ + struct pcie_service_card *card = adapter->card; + u8 *buffer; + u32 sleep_cookie, count; + + for (count = 0; count < max_delay_loop_cnt; count++) { + buffer = card->cmdrsp_buf->data - INTF_HEADER_LEN; + sleep_cookie = *(u32 *)buffer; + + if (sleep_cookie == MWIFIEX_DEF_SLEEP_COOKIE) { + dev_dbg(adapter->dev, + "sleep cookie found at count %d\n", count); + break; + } + usleep_range(20, 30); + } + + if (count >= max_delay_loop_cnt) + dev_dbg(adapter->dev, + "max count reached while accessing sleep cookie\n"); +} + /* This function wakes up the card by reading fw_status register. */ static int mwifiex_pm_wakeup_card(struct mwifiex_adapter *adapter) { @@ -1539,6 +1563,8 @@ static int mwifiex_pcie_process_cmd_complete(struct mwifiex_adapter *adapter) "Write register failed\n"); return -1; } + mwifiex_delay_for_sleep_cookie(adapter, + MWIFIEX_MAX_DELAY_COUNT); while (reg->sleep_cookie && (count++ < 10) && mwifiex_pcie_ok_to_access_hw(adapter)) usleep_range(50, 60); diff --git a/drivers/net/wireless/mwifiex/pcie.h b/drivers/net/wireless/mwifiex/pcie.h index 193af75..e8ec561 100644 --- a/drivers/net/wireless/mwifiex/pcie.h +++ b/drivers/net/wireless/mwifiex/pcie.h @@ -97,6 +97,8 @@ #define MWIFIEX_PCIE_BLOCK_SIZE_FW_DNLD 256 /* FW awake cookie after FW ready */ #define FW_AWAKE_COOKIE (0xAA55AA55) +#define MWIFIEX_DEF_SLEEP_COOKIE 0xBEEFBEEF +#define MWIFIEX_MAX_DELAY_COUNT 5 struct mwifiex_pcie_card_reg { u16 cmd_addr_lo; -- 1.8.2.3