From: Vidya Sagar <vidyas@nvidia.com>
To: <lpieralisi@kernel.org>, <robh@kernel.org>, <kw@linux.com>,
<bhelgaas@google.com>, <thierry.reding@gmail.com>,
<jonathanh@nvidia.com>, <kishon@ti.com>, <vkoul@kernel.org>,
<mani@kernel.org>, <Sergey.Semin@baikalelectronics.ru>,
<ffclaire1224@gmail.com>
Cc: <linux-pci@vger.kernel.org>, <linux-tegra@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-phy@lists.infradead.org>,
<kthota@nvidia.com>, <mmaddireddy@nvidia.com>,
<vidyas@nvidia.com>, <sagar.tv@gmail.com>
Subject: [PATCH V3 03/21] PCI: tegra194: Fix polling delay for L2 state
Date: Fri, 14 Oct 2022 00:08:36 +0530 [thread overview]
Message-ID: <20221013183854.21087-4-vidyas@nvidia.com> (raw)
In-Reply-To: <20221013183854.21087-1-vidyas@nvidia.com>
As per PCIe spec r6.0, 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.
Change it to 10 msec polling with 100 usec delay. Since this function
is used in non-atomic context only, use non-atomic poll function.
Fixes: 56e15a238d92 ("PCI: tegra: Add Tegra194 PCIe support")
Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
---
V3:
* Changed atomic call to non-atomic call
* Reworded the commit message
V2:
* None
drivers/pci/controller/dwc/pcie-tegra194.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index a33c86e3de9d..685aee378c93 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -207,7 +207,8 @@
#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 PME_ACK_DELAY 100 /* 100 us */
+#define PME_ACK_TIMEOUT 10000 /* 10 ms */
#define LTSSM_TIMEOUT 50000 /* 50ms */
@@ -1611,9 +1612,9 @@ 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,
+ PME_ACK_DELAY, PME_ACK_TIMEOUT);
}
static void tegra_pcie_dw_pme_turnoff(struct tegra_pcie_dw *pcie)
--
2.17.1
next prev parent reply other threads:[~2022-10-13 18:42 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-13 18:38 [PATCH V3 00/21] Enhancements to pcie-tegra194 driver Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 01/21] PCI: tegra194: Use devm_gpiod_get_optional() to parse "nvidia,refclk-select" Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 02/21] PCI: tegra194: Drive CLKREQ signal low explicitly Vidya Sagar
2022-10-13 18:38 ` Vidya Sagar [this message]
2022-10-13 18:38 ` [PATCH V3 04/21] PCI: tegra194: Handle errors in BPMP response Vidya Sagar
2023-01-13 15:15 ` Lorenzo Pieralisi
2022-10-13 18:38 ` [PATCH V3 05/21] PCI: tegra194: Apply pinctrl settings for both PCIe RP and EP Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 06/21] PCI: tegra194: Refactor LTSSM state polling on surprise down Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 07/21] PCI: tegra194: Disable direct speed change for EP Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 08/21] phy: tegra: p2u: Set ENABLE_L2_EXIT_RATE_CHANGE in calibration Vidya Sagar
2022-10-28 11:42 ` Vinod Koul
2022-10-28 11:49 ` Vidya Sagar
2022-10-28 12:13 ` Vinod Koul
2022-10-13 18:38 ` [PATCH V3 09/21] PCI: tegra194: Calibrate P2U for endpoint mode Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 10/21] PCI: tegra194: Free resources during controller deinitialization Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 11/21] PCI: tegra194: Remove IRQF_ONESHOT flag during Endpoint interrupt registration Vidya Sagar
2022-11-14 11:56 ` Lorenzo Pieralisi
2023-01-13 15:21 ` Lorenzo Pieralisi
2022-10-13 18:38 ` [PATCH V3 12/21] PCI: tegra194: Enable DMA interrupt Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 13/21] PCI: tegra194: Enable hardware hot reset mode in Endpoint Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 14/21] PCI: tegra194: Allow system suspend when the Endpoint link is not up Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 15/21] PCI: tegra194: Disable L1.2 capability of Tegra234 EP Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 16/21] PCI: tegra194: Set LTR message request before PCIe link up Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 17/21] PCI: tegra194: Reduce AXI slave timeout value Vidya Sagar
2023-01-13 15:31 ` Lorenzo Pieralisi
2022-10-13 18:38 ` [PATCH V3 18/21] PCI: tegra194: Don't force the device into the D0 state before L2 Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 19/21] PCI: tegra194: Free up EP resources during remove() Vidya Sagar
2023-01-13 15:28 ` Lorenzo Pieralisi
2022-10-13 18:38 ` [PATCH V3 20/21] dt-bindings: PCI: tegra194: Add monitor clock support Vidya Sagar
2022-10-13 18:38 ` [PATCH V3 21/21] PCI: tegra194: Add core " Vidya Sagar
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