linux-kernel - Re: [PATCH V2 2/2] soc: s4: Add support for power domains controller

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Message-ID: <b846de5f-cf30-c000-ea37-61d79bcd4e7e@baylibre.com>
Date:   Thu, 20 Jan 2022 09:59:03 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     "shunzhou.jiang@...ogic.com" <shunzhou.jiang@...ogic.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic <linux-amlogic@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        khilman <khilman@...libre.com>, jbrunet <jbrunet@...libre.com>
Subject: Re: [PATCH V2 2/2] soc: s4: Add support for power domains controller

Hi Shunzhou,

On 18/01/2022 03:26, shunzhou.jiang@...ogic.com wrote:
> Dears Neil & Martin:
> Sorry for my late reply
> S4_VPU_HDMI:  for vpu domain,  this domain provide power to many moudles(osd, vpp, hdr, dv, di), if close, will cause system crash
> S4_USB_COMB domain: for usb, if not always on,  all usb status will clear to 0, that's not right status for usb
> S4_ETH: for ethernet online wakeup, and if power down, status also not right
>>> +       SEC_PD(S4_VPU_HDMI,     GENPD_FLAG_ALWAYS_ON),
>>> +       SEC_PD(S4_USB_COMB,     GENPD_FLAG_ALWAYS_ON),
>>> +       SEC_PD(S4_GE2D,         0),
>>> +       SEC_PD(S4_ETH,          GENPD_FLAG_ALWAYS_ON),

Thanks for clarifications, can you resend the patchset with those infos in comments like it was done for A1 ?

Thanks,
Neil

> 
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> Shunzhou Jiang
> SW Department
> 
>      
>     *From:* Neil Armstrong <mailto:narmstrong@...libre.com>
>     *Date:* 2022-01-12 16:36
>     *To:* Martin Blumenstingl <mailto:martin.blumenstingl@...glemail.com>; Shunzhou.Jiang <mailto:shunzhou.jiang@...ogic.com>
>     *CC:* devicetree <mailto:devicetree@...r.kernel.org>; linux-arm-kernel <mailto:linux-arm-kernel@...ts.infradead.org>; linux-amlogic <mailto:linux-amlogic@...ts.infradead.org>; linux-kernel <mailto:linux-kernel@...r.kernel.org>; khilman <mailto:khilman@...libre.com>; jbrunet <mailto:jbrunet@...libre.com>
>     *Subject:* Re: [PATCH V2 2/2] soc: s4: Add support for power domains controller
>     [ EXTERNAL EMAIL ]
>      
>     Hi Shunzhou,
>      
>     On 30/12/2021 23:15, Martin Blumenstingl wrote:
>     > On Thu, Dec 30, 2021 at 10:44 AM Shunzhou.Jiang
>     > <shunzhou.jiang@...ogic.com> wrote:
>     >>
>     >> From: Shunzhou Jiang <shunzhou.jiang@...ogic.com>
>     >>
>     >> Add support s4 Power controller. In s4, power control
>     >> registers are in secure domain, and should be accessed by smc.
>     >>
>     >> Signed-off-by: Shunzhou Jiang <shunzhou.jiang@...ogic.com>
>     > Also here I don't have any datasheet to compare this with, so this gets my:
>     > Acked-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
>     >
>     > [...]
>     >> +       SEC_PD(S4_VPU_HDMI,     GENPD_FLAG_ALWAYS_ON),
>     >> +       SEC_PD(S4_USB_COMB,     GENPD_FLAG_ALWAYS_ON),
>     >> +       SEC_PD(S4_GE2D,         0),
>     >> +       SEC_PD(S4_ETH,          GENPD_FLAG_ALWAYS_ON),
>     > For the A1 SoC's UART entry we have the following comment which
>     > explains why we want to to be "always on":
>     >   UART should keep working in ATF after suspend and before resume
>     >
>     > If for some reason you need to re-send this series then it would be
>     > great if you could add a comment above each entry with
>     > GENPD_FLAG_ALWAYS_ON.
>     > It will help others (like me) understand these SoCs better.
>      
>     Can you resend with those comments added so I can apply the patches ?
>      
>     Thanks,
>     Neil
>      
>     >
>     >
>     > Best regards,
>     > Martin
>     >
>      
>