[PATCH v8 01/14] PCI: tegra194: Fix polling delay for L2 state

[Manikanta Maddireddy]

From: Vidya Sagar <vidyas@xxxxxxxxxx>

As per PCIe spec r7.0, sec 5.3.3.2.1, after sending PME_Turn_Off message,
Root Port should wait for 1~10 msec for PME_TO_Ack message. Currently,
driver is polling for 10 msec with 1 usec delay which is aggressive.
Use existing macro PCIE_PME_TO_L2_TIMEOUT_US to poll for 10 msec with
1 msec delay. Since this function is used in non-atomic context only,
use non-atomic poll function.

Fixes: 56e15a238d92 ("PCI: tegra: Add Tegra194 PCIe support")
Reviewed-by: Jon Hunter <jonathanh@xxxxxxxxxx>
Tested-by: Jon Hunter <jonathanh@xxxxxxxxxx>
Signed-off-by: Vidya Sagar <vidyas@xxxxxxxxxx>
Signed-off-by: Manikanta Maddireddy <mmaddireddy@xxxxxxxxxx>
---
Changes V8: None
Changes V6 -> V7: Use PCIE_PME_TO_L2_TIMEOUT_US instead PME_ACK_TIMEOUT
Changes V1 -> V6: None

 drivers/pci/controller/dwc/pcie-tegra194.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 0ddeef70726d..d6c6bd512b51 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -198,8 +198,6 @@
 #define CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_MASK	GENMASK(11, 8)
 #define CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_SHIFT	8
 
-#define PME_ACK_TIMEOUT 10000
-
 #define LTSSM_TIMEOUT 50000	/* 50ms */
 
 #define GEN3_GEN4_EQ_PRESET_INIT	5
@@ -1553,9 +1551,10 @@ static int tegra_pcie_try_link_l2(struct tegra_pcie_dw *pcie)
 	val |= APPL_PM_XMT_TURNOFF_STATE;
 	appl_writel(pcie, val, APPL_RADM_STATUS);
 
-	return readl_poll_timeout_atomic(pcie->appl_base + APPL_DEBUG, val,
-				 val & APPL_DEBUG_PM_LINKST_IN_L2_LAT,
-				 1, PME_ACK_TIMEOUT);
+	return readl_poll_timeout(pcie->appl_base + APPL_DEBUG, val,
+				  val & APPL_DEBUG_PM_LINKST_IN_L2_LAT,
+				  PCIE_PME_TO_L2_TIMEOUT_US/10,
+				  PCIE_PME_TO_L2_TIMEOUT_US);
 }
 
 static void tegra_pcie_dw_pme_turnoff(struct tegra_pcie_dw *pcie)
-- 
2.34.1