linux-kernel - Re: [PATCH] PCI: rockchip: correct the use of FTS mask

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Date:   Fri, 11 Nov 2016 16:30:07 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
        Brian Norris <computersforpeace@...il.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Wenrui Li <wenrui.li@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>, linux-pci@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, Rajat Jain <rajatja@...gle.com>
Subject: Re: [PATCH] PCI: rockchip: correct the use of FTS mask

On Tue, Oct 18, 2016 at 04:13:04PM -0700, Brian Norris wrote:
> We're trying to mask out bits[23:8] while retaining [32:24, 7:0], but
> we're doing the inverse. That doesn't have too much effect, since we're
> setting all the [23:8] bits to 1, and the other bits are only relevant
> for modes we're currently not using. But we should get this right.
> 
> Fixes: ca1989084054 ("PCI: rockchip: Fix wrong transmitted FTS count")
> Signed-off-by: Brian Norris <briannorris@...omium.org>

I assume this is correct, but I'm waiting for an ack from Shawn.

> ---
>  drivers/pci/host/pcie-rockchip.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
> index e0b22dab9b7a..5c2e3297a3ff 100644
> --- a/drivers/pci/host/pcie-rockchip.c
> +++ b/drivers/pci/host/pcie-rockchip.c
> @@ -492,7 +492,7 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
>  
>  	/* Fix the transmitted FTS count desired to exit from L0s. */
>  	status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL_PLC1);
> -	status = (status & PCIE_CORE_CTRL_PLC1_FTS_MASK) |
> +	status = (status & ~PCIE_CORE_CTRL_PLC1_FTS_MASK) |
>  		 (PCIE_CORE_CTRL_PLC1_FTS_CNT << PCIE_CORE_CTRL_PLC1_FTS_SHIFT);
>  	rockchip_pcie_write(rockchip, status, PCIE_CORE_CTRL_PLC1);
>  
> -- 
> 2.8.0.rc3.226.g39d4020
>