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rtw88: 8822ce: set CLKREQ# signal to low during suspend

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We find the power sequence of system suspend flow don't meet
the criteria when using 8822CE-VR chip by rfe-type 6, because the
reference clock form host is sometimes late. To avoid the behavoir,
we keep CLKREQ# signal to low during suspend to make sure the reference
clock arrival in time.

Signed-off-by: Chin-Yen Lee <timlee@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210727100503.31626-1-pkshih@realtek.com
This commit is contained in:
Chin-Yen Lee 2021-07-27 18:05:03 +08:00 committed by Kalle Valo
parent 0c283b4753
commit 8d52b46caf
2 changed files with 34 additions and 0 deletions
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33
drivers/net/wireless/realtek/rtw88/pci.c
View File

@ -1359,6 +1359,25 @@ static void rtw_pci_clkreq_set(struct rtw_dev *rtwdev, bool enable)
rtw_dbi_write8(rtwdev, RTK_PCIE_LINK_CFG, value);
}
static void rtw_pci_clkreq_pad_low(struct rtw_dev *rtwdev, bool enable)
{
u8 value;
int ret;
ret = rtw_dbi_read8(rtwdev, RTK_PCIE_LINK_CFG, &value);
if (ret) {
rtw_err(rtwdev, "failed to read CLKREQ_L1, ret=%d", ret);
return;
}
if (enable)
value &= ~BIT_CLKREQ_N_PAD;
else
value |= BIT_CLKREQ_N_PAD;
rtw_dbi_write8(rtwdev, RTK_PCIE_LINK_CFG, value);
}
static void rtw_pci_aspm_set(struct rtw_dev *rtwdev, bool enable)
{
u8 value;
@ -1500,11 +1519,25 @@ static void rtw_pci_phy_cfg(struct rtw_dev *rtwdev)
static int __maybe_unused rtw_pci_suspend(struct device *dev)
{
struct ieee80211_hw *hw = dev_get_drvdata(dev);
struct rtw_dev *rtwdev = hw->priv;
struct rtw_chip_info *chip = rtwdev->chip;
struct rtw_efuse *efuse = &rtwdev->efuse;
if (chip->id == RTW_CHIP_TYPE_8822C && efuse->rfe_option == 6)
rtw_pci_clkreq_pad_low(rtwdev, true);
return 0;
}
static int __maybe_unused rtw_pci_resume(struct device *dev)
{
struct ieee80211_hw *hw = dev_get_drvdata(dev);
struct rtw_dev *rtwdev = hw->priv;
struct rtw_chip_info *chip = rtwdev->chip;
struct rtw_efuse *efuse = &rtwdev->efuse;
if (chip->id == RTW_CHIP_TYPE_8822C && efuse->rfe_option == 6)
rtw_pci_clkreq_pad_low(rtwdev, false);
return 0;
}

1
drivers/net/wireless/realtek/rtw88/pci.h
View File

@ -37,6 +37,7 @@
#define RTK_PCIE_LINK_CFG 0x0719
#define BIT_CLKREQ_SW_EN BIT(4)
#define BIT_L1_SW_EN BIT(3)
#define BIT_CLKREQ_N_PAD BIT(0)
#define RTK_PCIE_CLKDLY_CTRL 0x0725
#define BIT_PCI_BCNQ_FLAG BIT(4)