[PATCH v2 4/4] PCI: mediatek-gen3: Add comment about initialization order in mtk_pcie_en7581_power_up()

[Manivannan Sadhasivam]

On Sat, Nov 09, 2024 at 10:28:40AM +0100, Lorenzo Bianconi wrote:
> Add a comment in mtk_pcie_en7581_power_up() to clarify, unlike MediaTek
> PCIe controller, the Airoha EN7581 requires PHY initialization and
> power-on before PHY reset deassert.
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam at linaro.org>

- Mani

> ---
>  drivers/pci/controller/pcie-mediatek-gen3.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
> index 1ad93d2407810ba873d9a16da96208b3cc0c3011..c9981013e59d18ccd3294acdcbd536dd95a0e436 100644
> --- a/drivers/pci/controller/pcie-mediatek-gen3.c
> +++ b/drivers/pci/controller/pcie-mediatek-gen3.c
> @@ -884,6 +884,10 @@ static int mtk_pcie_en7581_power_up(struct mtk_gen3_pcie *pcie)
>  	 */
>  	mdelay(PCIE_EN7581_RESET_TIME_MS);
>  
> +	/*
> +	 * Unlike the MediaTek controllers, the Airoha EN7581 requires PHY
> +	 * initialization and power-on before PHY reset deassert.
> +	 */
>  	err = phy_init(pcie->phy);
>  	if (err) {
>  		dev_err(dev, "failed to initialize PHY\n");
> 
> -- 
> 2.47.0
> 

-- 
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