diff options
Diffstat (limited to 'drivers/pci/controller/dwc/pcie-tegra194.c')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-tegra194.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index f4109d71f20b..5597b2a49598 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1506,6 +1506,14 @@ static void tegra_pcie_dw_pme_turnoff(struct tegra_pcie_dw *pcie) data &= ~APPL_PINMUX_PEX_RST; appl_writel(pcie, data, APPL_PINMUX); + /* + * Some cards do not go to detect state even after de-asserting + * PERST#. So, de-assert LTSSM to bring link to detect state. + */ + data = readl(pcie->appl_base + APPL_CTRL); + data &= ~APPL_CTRL_LTSSM_EN; + writel(data, pcie->appl_base + APPL_CTRL); + err = readl_poll_timeout_atomic(pcie->appl_base + APPL_DEBUG, data, ((data & @@ -1513,14 +1521,8 @@ static void tegra_pcie_dw_pme_turnoff(struct tegra_pcie_dw *pcie) APPL_DEBUG_LTSSM_STATE_SHIFT) == LTSSM_STATE_PRE_DETECT, 1, LTSSM_TIMEOUT); - if (err) { + if (err) dev_info(pcie->dev, "Link didn't go to detect state\n"); - } else { - /* Disable LTSSM after link is in detect state */ - data = appl_readl(pcie, APPL_CTRL); - data &= ~APPL_CTRL_LTSSM_EN; - appl_writel(pcie, data, APPL_CTRL); - } } /* * DBI registers may not be accessible after this as PLL-E would be |