rtw88: pci: use for loop instead of while loop for DBI/MDIO

Use a for loop to polling DBI/MDIO read/write flags to avoid
infinite loop happens

Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Reviewed-by: Chris Chiu <chiu@endlessm.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c
index b158ef8..6d1aa6f 100644 (file)
--- a/drivers/net/wireless/realtek/rtw88/pci.c
+++ b/drivers/net/wireless/realtek/rtw88/pci.c
@@ -1062,7 +1062,7 @@ static void rtw_dbi_write8(struct rtw_dev *rtwdev, u16 addr, u8 data)
        u16 write_addr;
        u16 remainder = addr & ~(BITS_DBI_WREN | BITS_DBI_ADDR_MASK);
        u8 flag;
-       u8 cnt = RTW_PCI_WR_RETRY_CNT;
+       u8 cnt;
 
        write_addr = addr & BITS_DBI_ADDR_MASK;
        write_addr |= u16_encode_bits(BIT(remainder), BITS_DBI_WREN);
@@ -1070,21 +1070,22 @@ static void rtw_dbi_write8(struct rtw_dev *rtwdev, u16 addr, u8 data)
        rtw_write16(rtwdev, REG_DBI_FLAG_V1, write_addr);
        rtw_write8(rtwdev, REG_DBI_FLAG_V1 + 2, BIT_DBI_WFLAG >> 16);
 
-       flag = rtw_read8(rtwdev, REG_DBI_FLAG_V1 + 2);
-       while (flag && (cnt != 0)) {
-               udelay(10);
+       for (cnt = 0; cnt < RTW_PCI_WR_RETRY_CNT; cnt++) {
                flag = rtw_read8(rtwdev, REG_DBI_FLAG_V1 + 2);
-               cnt--;
+               if (flag == 0)
+                       return;
+
+               udelay(10);
        }
 
-       WARN(flag, "DBI write fail\n");
+       WARN(flag, "failed to write to DBI register, addr=0x%04x\n", addr);
 }
 
 static void rtw_mdio_write(struct rtw_dev *rtwdev, u8 addr, u16 data, bool g1)
 {
        u8 page;
        u8 wflag;
-       u8 cnt = RTW_PCI_WR_RETRY_CNT;
+       u8 cnt;
 
        rtw_write16(rtwdev, REG_MDIO_V1, data);
 
@@ -1094,15 +1095,16 @@ static void rtw_mdio_write(struct rtw_dev *rtwdev, u8 addr, u16 data, bool g1)
        rtw_write8(rtwdev, REG_PCIE_MIX_CFG + 3, page);
        rtw_write32_mask(rtwdev, REG_PCIE_MIX_CFG, BIT_MDIO_WFLAG_V1, 1);
 
-       wflag = rtw_read32_mask(rtwdev, REG_PCIE_MIX_CFG, BIT_MDIO_WFLAG_V1);
-       while (wflag && (cnt != 0)) {
-               udelay(10);
+       for (cnt = 0; cnt < RTW_PCI_WR_RETRY_CNT; cnt++) {
                wflag = rtw_read32_mask(rtwdev, REG_PCIE_MIX_CFG,
                                        BIT_MDIO_WFLAG_V1);
-               cnt--;
+               if (wflag == 0)
+                       return;
+
+               udelay(10);
        }
 
-       WARN(wflag, "MDIO write fail\n");
+       WARN(wflag, "failed to write to MDIO register, addr=0x%02x\n", addr);
 }
 
 static void rtw_pci_phy_cfg(struct rtw_dev *rtwdev)