From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To: "Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Rob Herring" <robh@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Kishon Vijay Abraham I" <kishon@kernel.org>,
"Thierry Reding" <thierry.reding@gmail.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
"Jingoo Han" <jingoohan1@gmail.com>,
"Gustavo Pimentel" <gustavo.pimentel@synopsys.com>
Cc: linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org, mhi@lists.linux.dev,
linux-tegra@vger.kernel.org,
Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
Vidya Sagar <vidyas@nvidia.com>
Subject: [PATCH 11/11] PCI: tegra194: Rework {start/stop}_link() callbacks implementation
Date: Thu, 14 Mar 2024 20:53:50 +0530 [thread overview]
Message-ID: <20240314-pci-epf-rework-v1-11-6134e6c1d491@linaro.org> (raw)
In-Reply-To: <20240314-pci-epf-rework-v1-0-6134e6c1d491@linaro.org>
DWC specific start_link() and stop_link() callbacks are supposed to start
and stop the link training of the PCIe bus. But the current endpoint
implementation of this driver enables/disables the PERST# IRQ.
Even though this is not causing any issues, this creates inconsistency
among the EP controller drivers. So for the sake of consistency, let's just
start/stop the link training in these callbacks.
Also, PERST# IRQ is now enabled from the start itself, thus allowing the
controller driver to initialize the registers when PERST# gets deasserted
without waiting for the user intervention though configfs.
Cc: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
drivers/pci/controller/dwc/pcie-tegra194.c | 24 ++++++++++--------------
1 file changed, 10 insertions(+), 14 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 3e6e08b321fb..03d6f248bc6f 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -964,7 +964,11 @@ static int tegra_pcie_dw_start_link(struct dw_pcie *pci)
bool retry = true;
if (pcie->of_data->mode == DW_PCIE_EP_TYPE) {
- enable_irq(pcie->pex_rst_irq);
+ /* Enable LTSSM */
+ val = appl_readl(pcie, APPL_CTRL);
+ val |= APPL_CTRL_LTSSM_EN;
+ appl_writel(pcie, val, APPL_CTRL);
+
return 0;
}
@@ -1049,8 +1053,12 @@ static int tegra_pcie_dw_link_up(struct dw_pcie *pci)
static void tegra_pcie_dw_stop_link(struct dw_pcie *pci)
{
struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
+ u32 val;
- disable_irq(pcie->pex_rst_irq);
+ /* Disable LTSSM */
+ val = appl_readl(pcie, APPL_CTRL);
+ val &= ~APPL_CTRL_LTSSM_EN;
+ appl_writel(pcie, val, APPL_CTRL);
}
static const struct dw_pcie_ops tegra_dw_pcie_ops = {
@@ -1702,11 +1710,6 @@ static void pex_ep_event_pex_rst_assert(struct tegra_pcie_dw *pcie)
if (pcie->ep_state == EP_STATE_DISABLED)
return;
- /* Disable LTSSM */
- val = appl_readl(pcie, APPL_CTRL);
- val &= ~APPL_CTRL_LTSSM_EN;
- appl_writel(pcie, val, APPL_CTRL);
-
ret = readl_poll_timeout(pcie->appl_base + APPL_DEBUG, val,
((val & APPL_DEBUG_LTSSM_STATE_MASK) >>
APPL_DEBUG_LTSSM_STATE_SHIFT) ==
@@ -1913,11 +1916,6 @@ static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie)
appl_writel(pcie, val, APPL_LTR_MSG_2);
}
- /* Enable LTSSM */
- val = appl_readl(pcie, APPL_CTRL);
- val |= APPL_CTRL_LTSSM_EN;
- appl_writel(pcie, val, APPL_CTRL);
-
pcie->ep_state = EP_STATE_ENABLED;
dev_dbg(dev, "Initialization of endpoint is completed\n");
@@ -2060,8 +2058,6 @@ static int tegra_pcie_config_ep(struct tegra_pcie_dw *pcie,
return -ENOMEM;
}
- irq_set_status_flags(pcie->pex_rst_irq, IRQ_NOAUTOEN);
-
pcie->ep_state = EP_STATE_DISABLED;
ret = devm_request_threaded_irq(dev, pcie->pex_rst_irq, NULL,
--
2.25.1
next prev parent reply other threads:[~2024-03-14 15:24 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-14 15:23 [PATCH 00/11] PCI: endpoint: Make host reboot handling more robust Manivannan Sadhasivam
2024-03-14 15:23 ` [PATCH 01/11] PCI: qcom-ep: Disable resources unconditionally during PERST# assert Manivannan Sadhasivam
2024-03-22 16:08 ` Niklas Cassel
2024-03-26 7:44 ` Manivannan Sadhasivam
2024-03-26 10:24 ` Niklas Cassel
2024-03-26 11:10 ` Manivannan Sadhasivam
2024-03-26 13:47 ` Niklas Cassel
2024-03-26 13:55 ` Manivannan Sadhasivam
2024-03-26 10:37 ` Niklas Cassel
2024-03-14 15:23 ` [PATCH 02/11] PCI: endpoint: Decouple EPC and PCIe bus specific events Manivannan Sadhasivam
2024-03-22 16:08 ` Niklas Cassel
2024-03-26 7:49 ` Manivannan Sadhasivam
2024-03-14 15:23 ` [PATCH 03/11] PCI: endpoint: Rename core_init() callback in 'struct pci_epc_event_ops' to init() Manivannan Sadhasivam
2024-03-22 16:08 ` Niklas Cassel
2024-03-26 7:56 ` Manivannan Sadhasivam
2024-03-14 15:23 ` [PATCH 04/11] PCI: epf-test: Refactor pci_epf_test_unbind() function Manivannan Sadhasivam
2024-03-22 16:09 ` Niklas Cassel
2024-03-26 7:58 ` Manivannan Sadhasivam
2024-03-14 15:23 ` [PATCH 05/11] PCI: epf-{mhi/test}: Move DMA initialization to EPC init callback Manivannan Sadhasivam
2024-03-22 16:10 ` Niklas Cassel
2024-03-26 8:26 ` Manivannan Sadhasivam
2024-03-26 11:05 ` Niklas Cassel
2024-03-26 14:27 ` Niklas Cassel
2024-03-27 6:20 ` Manivannan Sadhasivam
2024-03-27 6:18 ` Manivannan Sadhasivam
2024-03-27 11:39 ` Niklas Cassel
2024-03-28 18:42 ` Vinod Koul
2024-04-04 8:44 ` Niklas Cassel
2024-04-22 7:55 ` Manivannan Sadhasivam
2024-04-22 9:30 ` Niklas Cassel
2024-03-14 15:23 ` [PATCH 06/11] PCI: endpoint: Introduce EPC 'deinit' event and notify the EPF drivers Manivannan Sadhasivam
2024-03-22 16:10 ` Niklas Cassel
2024-03-26 8:31 ` Manivannan Sadhasivam
2024-03-14 15:23 ` [PATCH 07/11] PCI: dwc: ep: Add a generic dw_pcie_ep_linkdown() API to handle Link Down event Manivannan Sadhasivam
2024-03-22 16:10 ` Niklas Cassel
2024-03-27 18:06 ` Niklas Cassel
2024-04-01 16:34 ` Manivannan Sadhasivam
2024-03-14 15:23 ` [PATCH 08/11] PCI: qcom-ep: Use the " Manivannan Sadhasivam
2024-03-14 15:23 ` [PATCH 09/11] PCI: epf-test: Handle " Manivannan Sadhasivam
2024-03-22 16:10 ` Niklas Cassel
2024-03-14 15:23 ` [PATCH 10/11] PCI: qcom-ep: Rework {start/stop}_link() callbacks implementation Manivannan Sadhasivam
2024-03-22 16:10 ` Niklas Cassel
2024-03-26 8:33 ` Manivannan Sadhasivam
2024-03-14 15:23 ` Manivannan Sadhasivam [this message]
2024-03-22 16:11 ` [PATCH 11/11] PCI: tegra194: " Niklas Cassel
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