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pci: msm: Dump PCIe registers to debug linkdown

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

Change-Id: I54a19245e91e68f0d58f230509e6cb1a2ff02665
Signed-off-by: Vivek Pernamitta <vpernami@codeaurora.org>
This commit is contained in:
Vivek Pernamitta 2020-11-11 16:11:47 +05:30
commit 9c31f04cf2
1 changed files with 30 additions and 0 deletions
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30
drivers/pci/controller/pci-msm.c
View file

@ -1186,6 +1186,29 @@ 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",
@ -4727,6 +4750,13 @@ static void msm_pcie_handle_linkdown(struct msm_pcie_dev_t *dev)
dev->link_status = MSM_PCIE_LINK_DOWN;
dev->shadow_en = false;
/* PCIe registers dump on link down */
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);
/* assert PERST */
if (!(msm_pcie_keep_resources_on & BIT(dev->rc_idx)))
gpio_set_value(dev->gpio[MSM_PCIE_GPIO_PERST].num,