linux-kernel - Re: [PATCH 3/5] PCI: mt7621: avoid custom MIPS code in driver code

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Message-ID: <20211201181609.GA2831753@bhelgaas>
Date:   Wed, 1 Dec 2021 12:16:09 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Sergio Paracuellos <sergio.paracuellos@...il.com>
Cc:     linux-pci@...r.kernel.org, linux-mips@...r.kernel.org,
        tsbogend@...ha.franken.de, john@...ozen.org,
        lorenzo.pieralisi@....com, bhelgaas@...gle.com, arnd@...db.de,
        linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH 3/5] PCI: mt7621: avoid custom MIPS code in driver code

s/avoid custom/Avoid custom/ in subject.

On Mon, Nov 15, 2021 at 08:08:07AM +0100, Sergio Paracuellos wrote:
> Driver code is setting up MIPS specific I/O coherency units addresses config.
> This MIPS specific thing has been moved to be done when PCI code call the
> 'pcibios_root_bridge_prepare()' function which has been implemented for MIPS
> ralink mt7621 platform. Hence, remove MIPS specific code from driver code.
> After this changes there is also no need to add any MIPS specific includes
> to avoid some errors reported by Kernet Tets Robot with W=1 builds.

s/this changes/this change/
s/Tets/Test/

The patch doesn't touch any #include lines, so I'm not sure what the
last sentence is telling us.

> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
> ---
>  drivers/pci/controller/pcie-mt7621.c | 37 ----------------------------
>  1 file changed, 37 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-mt7621.c b/drivers/pci/controller/pcie-mt7621.c
> index b60dfb45ef7b..9cf541f5de9c 100644
> --- a/drivers/pci/controller/pcie-mt7621.c
> +++ b/drivers/pci/controller/pcie-mt7621.c
> @@ -208,37 +208,6 @@ static inline void mt7621_control_deassert(struct mt7621_pcie_port *port)
>  		reset_control_assert(port->pcie_rst);
>  }
>  
> -static int setup_cm_memory_region(struct pci_host_bridge *host)
> -{
> -	struct mt7621_pcie *pcie = pci_host_bridge_priv(host);
> -	struct device *dev = pcie->dev;
> -	struct resource_entry *entry;
> -	resource_size_t mask;
> -
> -	entry = resource_list_first_type(&host->windows, IORESOURCE_MEM);
> -	if (!entry) {
> -		dev_err(dev, "cannot get memory resource\n");
> -		return -EINVAL;
> -	}
> -
> -	if (mips_cps_numiocu(0)) {
> -		/*
> -		 * FIXME: hardware doesn't accept mask values with 1s after
> -		 * 0s (e.g. 0xffef), so it would be great to warn if that's
> -		 * about to happen
> -		 */
> -		mask = ~(entry->res->end - entry->res->start);
> -
> -		write_gcr_reg1_base(entry->res->start);
> -		write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0);
> -		dev_info(dev, "PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n",
> -			 (unsigned long long)read_gcr_reg1_base(),
> -			 (unsigned long long)read_gcr_reg1_mask());
> -	}
> -
> -	return 0;
> -}
> -
>  static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie,
>  				  struct device_node *node,
>  				  int slot)
> @@ -557,12 +526,6 @@ static int mt7621_pci_probe(struct platform_device *pdev)
>  		goto remove_resets;
>  	}
>  
> -	err = setup_cm_memory_region(bridge);
> -	if (err) {
> -		dev_err(dev, "error setting up iocu mem regions\n");
> -		goto remove_resets;
> -	}
> -
>  	return mt7621_pcie_register_host(bridge);
>  
>  remove_resets:
> -- 
> 2.33.0
>