linux-kernel - Re: [PATCH] PCI: rockchip: Enable the phy driver when controller is enabled

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Date:   Fri, 8 Apr 2022 15:18:09 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Punit Agrawal <punitagrawal@...il.com>, shawn.lin@...k-chips.com,
        Heiko Stuebner <heiko@...ech.de>
Cc:     bhelgaas@...gle.com, robh@...nel.org, kw@...ux.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH] PCI: rockchip: Enable the phy driver when controller is
 enabled

On Tue, Oct 19, 2021 at 09:02:15PM +0900, Punit Agrawal wrote:
> The PCI controller on rk3399 requires the phy to correctly initialise
> the PCIE phy. Without phy initialisation the host and end-point
> controllers cannot be used.
> 
> To prevent building an unusable PCIe driver on rk3399, enable the phy
> driver when the host or end-point driver is enabled.
> 
> Signed-off-by: Punit Agrawal <punitagrawal@...il.com>
> ---
> Hi,
> 
> I've been caught out many times when booting off of PCI and finding
> that the kernel cannot find rootfs due to the missing phy driver. The
> patch should prevents this by fixing the Kconfig dependency
> enablement. 
> 
> Thanks,
> Punit
> 
>  drivers/pci/controller/Kconfig | 2 ++
>  1 file changed, 2 insertions(+)

Shawn, Heiko,

can I go ahead with this patch please ?

Thanks,
Lorenzo

> diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
> index 326f7d13024f..1965df38c4a3 100644
> --- a/drivers/pci/controller/Kconfig
> +++ b/drivers/pci/controller/Kconfig
> @@ -214,6 +214,7 @@ config PCIE_ROCKCHIP_HOST
>  	depends on PCI_MSI_IRQ_DOMAIN
>  	select MFD_SYSCON
>  	select PCIE_ROCKCHIP
> +	select PHY_ROCKCHIP_PCIE
>  	help
>  	  Say Y here if you want internal PCI support on Rockchip SoC.
>  	  There is 1 internal PCIe port available to support GEN2 with
> @@ -226,6 +227,7 @@ config PCIE_ROCKCHIP_EP
>  	depends on PCI_ENDPOINT
>  	select MFD_SYSCON
>  	select PCIE_ROCKCHIP
> +	select PHY_ROCKCHIP_PCIE
>  	help
>  	  Say Y here if you want to support Rockchip PCIe controller in
>  	  endpoint mode on Rockchip SoC. There is 1 internal PCIe port
> -- 
> 2.33.0
>