linux-kernel - Re: [PATCH 4/4] bus: ti-sysc: Fix bogus resetdone warning for cpsw

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Date:   Fri, 30 Oct 2020 20:15:50 +0200
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Tony Lindgren <tony@...mide.com>, <linux-omap@...r.kernel.org>
CC:     Dave Gerlach <d-gerlach@...com>, Faiz Abbas <faiz_abbas@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Keerthy <j-keerthy@...com>, Nishanth Menon <nm@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Roger Quadros <rogerq@...com>, Suman Anna <s-anna@...com>,
        Tero Kristo <t-kristo@...com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 4/4] bus: ti-sysc: Fix bogus resetdone warning for cpsw

Hi Tony,

On 26/10/2020 12:58, Tony Lindgren wrote:
> The cpsw SOFT_RESET register is cleard when out of reset so let's
> add SYSS_QUIRK_RESETDONE_INVERTED flag for cpsw. Otherwise we will
> get bogus "OCP softreset timed out" warnings on boot.

Not sure if this quirk based approach is right way to move forward here.

The cpsw/cpgmac is "ti,sysc-omap4-simple" which means sysc_omap4_simple, which,
in turn, has .srst_shift = -ENODEV.

And above should be enough to avoid both sysc_reset() and sysc_wait_softreset() for such modules.


> 
> Fixes: d46f9fbec719 ("bus: ti-sysc: Use optional clocks on for enable and wait for softreset bit")
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
>   drivers/bus/ti-sysc.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
> --- a/drivers/bus/ti-sysc.c
> +++ b/drivers/bus/ti-sysc.c
> @@ -1364,6 +1364,8 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = {
>   	/* Quirks that need to be set based on detected module */
>   	SYSC_QUIRK("aess", 0, 0, 0x10, -ENODEV, 0x40000000, 0xffffffff,
>   		   SYSC_MODULE_QUIRK_AESS),
> +	SYSC_QUIRK("cpgmac", 0, 0x1200, 0x1208, 0x1204, 0x4edb1902,
> +		   0xffff00f0, SYSS_QUIRK_RESETDONE_INVERTED),
>   	SYSC_QUIRK("dcan", 0x48480000, 0x20, -ENODEV, -ENODEV, 0xa3170504, 0xffffffff,
>   		   SYSC_QUIRK_CLKDM_NOAUTO),
>   	SYSC_QUIRK("dss", 0x4832a000, 0, 0x10, 0x14, 0x00000020, 0xffffffff,
> @@ -1423,8 +1425,6 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = {
>   	SYSC_QUIRK("atl", 0, 0, -ENODEV, -ENODEV, 0x0a070100, 0xffffffff, 0),
>   	SYSC_QUIRK("cm", 0, 0, -ENODEV, -ENODEV, 0x40000301, 0xffffffff, 0),
>   	SYSC_QUIRK("control", 0, 0, 0x10, -ENODEV, 0x40000900, 0xffffffff, 0),
> -	SYSC_QUIRK("cpgmac", 0, 0x1200, 0x1208, 0x1204, 0x4edb1902,
> -		   0xffff00f0, 0),
>   	SYSC_QUIRK("dcan", 0, 0x20, -ENODEV, -ENODEV, 0xa3170504, 0xffffffff, 0),
>   	SYSC_QUIRK("dcan", 0, 0x20, -ENODEV, -ENODEV, 0x4edb1902, 0xffffffff, 0),
>   	SYSC_QUIRK("dispc", 0x4832a400, 0, 0x10, 0x14, 0x00000030, 0xffffffff, 0),
> 

-- 
Best regards,
grygorii