Re: [PATCH v6 5/9] PCI: tegra194: Enable hardware hot reset mode in Endpoint

[Vidya Sagar <vidyas@nvidia.com>]

On 24/02/26 00:15, Manikanta Maddireddy wrote:
> From: Vidya Sagar <vidyas@nvidia.com>
> 
> 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@nvidia.com>
> Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
> ---
> Changes V1 -> V6: None
> 
>  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 110f2adb74d2..f6305a880cad 100644
> --- a/drivers/pci/controller/dwc/pcie-tegra194.c
> +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
> @@ -1775,6 +1775,8 @@ 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);

Reviewed-by: Vidya Sagar <vidyas@nvidia.com>