linux-kernel - [PATCH V3 13/21] PCI: tegra194: Enable hardware hot reset mode in Endpoint

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Date:   Fri, 14 Oct 2022 00:08:46 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <lpieralisi@...nel.org>, <robh@...nel.org>, <kw@...ux.com>,
        <bhelgaas@...gle.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <kishon@...com>, <vkoul@...nel.org>,
        <mani@...nel.org>, <Sergey.Semin@...kalelectronics.ru>,
        <ffclaire1224@...il.com>
CC:     <linux-pci@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-phy@...ts.infradead.org>,
        <kthota@...dia.com>, <mmaddireddy@...dia.com>, <vidyas@...dia.com>,
        <sagar.tv@...il.com>
Subject: [PATCH V3 13/21] PCI: tegra194: Enable hardware hot reset mode in Endpoint

When PCIe link goes down, hardware can retrain the link and try to link up.
To enable this feature, program the APPL_CTRL register with hardware hot
reset with immediate LTSSM enable mode.

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
V3:
* This is a new patch in this series

 drivers/pci/controller/dwc/pcie-tegra194.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index a1c3481585c9..78ee0f713e71 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1913,6 +1913,8 @@ static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie)
 	val = appl_readl(pcie, APPL_CTRL);
 	val |= APPL_CTRL_SYS_PRE_DET_STATE;
 	val |= APPL_CTRL_HW_HOT_RST_EN;
+	val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK << APPL_CTRL_HW_HOT_RST_MODE_SHIFT);
+	val |= (APPL_CTRL_HW_HOT_RST_MODE_IMDT_RST_LTSSM_EN << APPL_CTRL_HW_HOT_RST_MODE_SHIFT);
 	appl_writel(pcie, val, APPL_CTRL);
 
 	val = appl_readl(pcie, APPL_CFG_MISC);
-- 
2.17.1