linux-kernel - Re: [PATCH] PCI: dwc: Use {upper,lower}_32

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Date:   Mon, 11 Dec 2017 10:19:47 +0000
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Stephen Boyd <sboyd@...eaurora.org>
Cc:     Jingoo Han <jingoohan1@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH] PCI: dwc: Use {upper,lower}_32_bits() macros for clarity

On Tue, Nov 28, 2017 at 04:53:34PM -0800, Stephen Boyd wrote:
> We have macros for getting the upper or lower 32 bits of a
> number. Use them here to shave a couple lines off the code.
> 
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> ---
>  drivers/pci/dwc/pcie-designware-host.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
> index 157621175147..ae5abfddf8de 100644
> --- a/drivers/pci/dwc/pcie-designware-host.c
> +++ b/drivers/pci/dwc/pcie-designware-host.c
> @@ -89,10 +89,8 @@ void dw_pcie_msi_init(struct pcie_port *pp)
>  	msi_target = virt_to_phys((void *)pp->msi_data);
>  
>  	/* program the msi_data */
> -	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
> -			    (u32)(msi_target & 0xffffffff));
> -	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
> -			    (u32)(msi_target >> 32 & 0xffffffff));
> +	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4, lower_32_bits(msi_target));
> +	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4, upper_32_bits(msi_target));
>  }

Hi Stephen,

I was about to apply it but I think that for consistency it would be
better to convert to {lower,upper}_32_bits() also code in
dw_msi_setup_msg() and slightly reword the log accordingly; if you do
not mind sending a v2 with those changes I will apply then.

Thanks,
Lorenzo