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Commit 3c4fddd8 authored by Vivek Pernamitta's avatar Vivek Pernamitta
Browse files

pci: msm: Dump PCIe registers to debug linkdown 



Support to dump PARF,PHY,DBI/dm_core registers
for PCIe linkdown.

Change-Id: I1c591e676cda47fd9ded5ffe15a388672a75cb21
Signed-off-by: default avatarVivek Pernamitta <vpernami@codeaurora.org>
parent 0873aa6e

drivers/pci/controller/pci-msm.c

+33 −0
Original line number Diff line number Diff line
@@ -1280,6 +1280,29 @@ static void pcie_parf_dump(struct msm_pcie_dev_t *dev) 
	}

}



static void pcie_dm_core_dump(struct msm_pcie_dev_t *dev)

{

	int i, size;



	PCIE_DUMP(dev, "PCIe: RC%d DBI/dm_core register dump\n", dev->rc_idx);



	size = resource_size(dev->res[MSM_PCIE_RES_DM_CORE].resource);



	for (i = 0; i < size; i += 32) {

		PCIE_DUMP(dev,

			"RC%d: 0x%04x %08x %08x %08x %08x %08x %08x %08x %08x\n",

			dev->rc_idx, i,

			readl_relaxed(dev->dm_core + i),

			readl_relaxed(dev->dm_core + (i + 4)),

			readl_relaxed(dev->dm_core + (i + 8)),

			readl_relaxed(dev->dm_core + (i + 12)),

			readl_relaxed(dev->dm_core + (i + 16)),

			readl_relaxed(dev->dm_core + (i + 20)),

			readl_relaxed(dev->dm_core + (i + 24)),

			readl_relaxed(dev->dm_core + (i + 28)));

	}

}



static void msm_pcie_show_status(struct msm_pcie_dev_t *dev)

{

	PCIE_DBG_FS(dev, "PCIe: RC%d is %s enumerated\n",
@@ -5034,6 +5057,16 @@ static irqreturn_t handle_linkdown_irq(int irq, void *data) 
		dev->link_status = MSM_PCIE_LINK_DOWN;

		dev->shadow_en = false;



		/* PCIe registers dump on link down */

		if ((dev->rc_idx == 0) || (dev->rc_idx == 2)) {

			PCIE_DUMP(dev,

			"PCIe:Linkdown IRQ for RC%d Dumping PCIe registers\n",

			dev->rc_idx);

			pcie_phy_dump(dev);

			pcie_parf_dump(dev);

			pcie_dm_core_dump(dev);

		}



		if (dev->linkdown_panic)

			panic("User has chosen to panic on linkdown\n");