Re: [PATCH v4 3/6] PCI: mediatek-gen3: Move reset/assert callbacks in .power_up()

[Lorenzo Bianconi <lorenzo@kernel.org>]

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On Nov 18, Philipp Zabel wrote:
> On Mo, 2024-11-18 at 09:04 +0100, Lorenzo Bianconi wrote:
> > In order to make the code more readable, the reset_control_bulk_assert()
> > for PHY reset lines is moved to make it pair with
> > reset_control_bulk_deassert() in mtk_pcie_power_up() and
> > mtk_pcie_en7581_power_up(). The same change is done for
> > reset_control_assert() used to assert MAC reset line.
> > 
> > Introduce PCIE_MTK_RESET_TIME_US macro for the time needed to
> > complete PCIe reset on MediaTek controller.
> > 
> > Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> > Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> > ---
> >  drivers/pci/controller/pcie-mediatek-gen3.c | 27 +++++++++++++++++++--------
> >  1 file changed, 19 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
> > index 3cfcb45d31508142d28d338ff213f70de9b4e608..2b80edd4462ad4e9f2a5d192db7f99307113eb8a 100644
> > --- a/drivers/pci/controller/pcie-mediatek-gen3.c
> > +++ b/drivers/pci/controller/pcie-mediatek-gen3.c
> > @@ -125,6 +125,8 @@
> >  
> >  #define MAX_NUM_PHY_RESETS		3
> >  
> > +#define PCIE_MTK_RESET_TIME_US		10
> > +
> >  /* Time in ms needed to complete PCIe reset on EN7581 SoC */
> >  #define PCIE_EN7581_RESET_TIME_MS	100
> >  
> > @@ -912,6 +914,14 @@ static int mtk_pcie_en7581_power_up(struct mtk_gen3_pcie *pcie)
> >  	int err;
> >  	u32 val;
> >  
> > +	/*
> > +	 * 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_bulk_assert(pcie->soc->phy_resets.num_resets,
> > +				  pcie->phy_resets);
> > +	reset_control_assert(pcie->mac_reset);
> > +
> >  	/*
> >  	 * Wait for the time needed to complete the bulk assert in
> >  	 * mtk_pcie_setup for EN7581 SoC.
> 
> This comment is not correct anymore.

I agree naming is hard, but I guess we can assume with 'bulk' we refer to both
phy and mac reset (similar to what we have in mtk_pcie_power_up()),
what do you think?

Regards,
Lorenzo

> 
> 
> regards
> Philipp

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