linux-kernel - Re: [PATCH 36/37] ARM: DRA7: clockdomain: Change the CLKTRCTRL of CM_PCIE_CLKSTCTRL to SW

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Date:   Fri, 13 Jan 2017 09:15:37 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Arnd Bergmann <arnd@...db.de>, linux-pci@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...s.com, linux-arm-msm@...r.kernel.org,
        nsekhar@...com
Subject: Re: [PATCH 36/37] ARM: DRA7: clockdomain: Change the CLKTRCTRL of
 CM_PCIE_CLKSTCTRL to SW_WKUP

* Kishon Vijay Abraham I <kishon@...com> [170112 02:35]:
> The PCIe programming sequence in TRM suggests CLKSTCTRL of PCIe should
> be set to SW_WKUP. There are no issues when CLKSTCTRL is set to HW_AUTO
> in RC mode. However in EP mode, the host system is not able to access the
> MEMSPACE and setting the CLKSTCTRL to SW_WKUP fixes it.

I guess ideally in the long run we would set this dynamically based on
the selected mode, right?

Regards,

Tony

> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  arch/arm/mach-omap2/clockdomains7xx_data.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/mach-omap2/clockdomains7xx_data.c b/arch/arm/mach-omap2/clockdomains7xx_data.c
> index 6c67965..67ebff8 100644
> --- a/arch/arm/mach-omap2/clockdomains7xx_data.c
> +++ b/arch/arm/mach-omap2/clockdomains7xx_data.c
> @@ -524,7 +524,7 @@
>  	.dep_bit	  = DRA7XX_PCIE_STATDEP_SHIFT,
>  	.wkdep_srcs	  = pcie_wkup_sleep_deps,
>  	.sleepdep_srcs	  = pcie_wkup_sleep_deps,
> -	.flags		  = CLKDM_CAN_HWSUP_SWSUP,
> +	.flags		  = CLKDM_CAN_SWSUP,
>  };
>  
>  static struct clockdomain atl_7xx_clkdm = {
> -- 
> 1.7.9.5
> 
> --
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