[PATCH] phy: rockchip: snps-pcie3: Raise the SRAM init timeout

[Shawn Lin]

The SRAM initialization of the PCIe3 PHY may take longer than the 500us
currently allowed, especially on a slow power-up such as at low
temperature. In that case the driver reports

  lock failed 0x..., check input refclk and power supply

even though the input refclk and power supply are fine.

Raise the timeout to 20ms and use a named constant for it, applied to
both the RK3568 and RK3588 paths.

Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
---

 drivers/phy/rockchip/phy-rockchip-snps-pcie3.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c b/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c
index 4e8ffd1..bbbfd6d 100644
--- a/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c
+++ b/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c
@@ -19,6 +19,8 @@
 #include <linux/regmap.h>
 #include <linux/reset.h>
 
+#define RK_PCIE_SRAM_INIT_TIMEOUT		20000
+
 /* Register for RK3568 */
 #define GRF_PCIE30PHY_CON1			0x4
 #define GRF_PCIE30PHY_CON6			0x18
@@ -127,7 +129,7 @@ static int rockchip_p3phy_rk3568_init(struct rockchip_p3phy_priv *priv)
 	ret = regmap_read_poll_timeout(priv->phy_grf,
 				       GRF_PCIE30PHY_STATUS0,
 				       reg, SRAM_INIT_DONE(reg),
-				       0, 500);
+				       0, RK_PCIE_SRAM_INIT_TIMEOUT);
 	if (ret)
 		dev_err(&priv->phy->dev, "%s: lock failed 0x%x, check input refclk and power supply\n",
 		       __func__, reg);
@@ -187,11 +189,11 @@ static int rockchip_p3phy_rk3588_init(struct rockchip_p3phy_priv *priv)
 	ret = regmap_read_poll_timeout(priv->phy_grf,
 				       RK3588_PCIE3PHY_GRF_PHY0_STATUS1,
 				       reg, RK3588_SRAM_INIT_DONE(reg),
-				       0, 500);
+				       0, RK_PCIE_SRAM_INIT_TIMEOUT);
 	ret |= regmap_read_poll_timeout(priv->phy_grf,
 					RK3588_PCIE3PHY_GRF_PHY1_STATUS1,
 					reg, RK3588_SRAM_INIT_DONE(reg),
-					0, 500);
+					0, RK_PCIE_SRAM_INIT_TIMEOUT);
 	if (ret)
 		dev_err(&priv->phy->dev, "lock failed 0x%x, check input refclk and power supply\n",
 			reg);
-- 
2.7.4