[PATCH 3/4] PCI: mediatek-gen3: rely on reset_bulk APIs for phy reset lines

[Bjorn Helgaas]

On Fri, Jun 21, 2024 at 04:48:49PM +0200, Lorenzo Bianconi wrote:
> Use reset_bulk APIs to manage phy reset lines. This is a preliminary
> patch in order to add Airoha EN7581 pcie support.

If you have occasion to revise this:

  s/rely/Rely/ in subject
  s/phy/PHY/ in subject and commit log
  s/pcie/PCIe/ in commit log

> @@ -912,7 +927,13 @@ static int mtk_pcie_setup(struct mtk_gen3_pcie *pcie)
>  	 * The controller may have been left out of reset by the bootloader
>  	 * so make sure that we get a clean start by asserting resets here.
>  	 */
> -	reset_control_assert(pcie->phy_reset);
> +	reset_control_bulk_deassert(pcie->soc->phy_resets.num_rsts,
> +				    pcie->phy_resets);
> +	usleep_range(5000, 10000);
> +	reset_control_bulk_assert(pcie->soc->phy_resets.num_rsts,
> +				  pcie->phy_resets);
> +	msleep(100);

Where did these usleep and msleep numbers come from?  They should use
a #define that we can connect back to a spec.

These delays should also be mentioned in the commit log because it
appears unrelated to the conversion to the reset_bulk API.  Actually,
it would be even better if they were in a separate patch, since it
looks like a logically separate change.

>  	reset_control_assert(pcie->mac_reset);
>  	usleep_range(10, 20);

Unrelated to this patch, but it would be nice to have an explanation
of this existing delay, too.

Bjorn