Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH v3] usb: dwc3: support continuous runtime PM with dual
 role
To:     balbi@kernel.org
Cc:     gregkh@linuxfoundation.org, sergei.shtylyov@cogentembedded.com,
        rogerq@ti.com, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20200319100207.19957-1-martin.kepplinger@puri.sm>
From:   Martin Kepplinger <martin.kepplinger@puri.sm>
Autocrypt: addr=martin.kepplinger@puri.sm; keydata=
 mQINBFULfZABEADRxJqDOYAHfrp1w8Egcv88qoru37k1x0Ugy8S6qYtKLAAt7boZW+q5gPv3
 Sj2KjfkWA7gotXpASN21OIfE/puKGwhDLAySY1DGNMQ0gIVakUO0ji5GJPjeB9JlmN5hbA87
 Si9k3yKQQfv7Cf9Lr1iZaV4A4yjLP/JQMImaCVdC5KyqJ98Luwci1GbsLIGX3EEjfg1+MceO
 dnJTKZpBAKd1J7S2Ib3dRwvALdiD7zqMGqkw5xrtwasatS7pc6o/BFgA9GxbeIzKmvW/hc3Q
 amS/sB12BojyzdUJ3TnIoAqvwKTGcv5VYo2Z+3FV+/MJVXPo8cj2vmfxQx1WG4n6X0pK4X8A
 BkCKw2N/evMZblNqAzzGVtoJvqQYkzQ20Fm+d3wFl6lS1db4MB+kU13G8kEIE22Q3i6kx4NA
 N49FLlPeDabGfJUyDaZp5pmKdcd7/FIGH/HjShjx7g+LKSwWNMkDygr4WARAP4h8zYDZuNqe
 ofPvMLqJxHeexBPIGF/+OwMyTvM7otP5ODuFmq6OqjNPf1irJmkiFv3yEa+Ip0vZzwl4XvrZ
 U0IKjSy2rbRLg22NsJT0XVZJbutIXYSvIHGqSxzzfiOOLnRjR++fbeEoVlRJ4NZHDKCh3pJv
 LNd+j03jXr4Rm058YLgO7164yr7FhMZniBJw6z648rk8/8gGPQARAQABtC1NYXJ0aW4gS2Vw
 cGxpbmdlciA8bWFydGluLmtlcHBsaW5nZXJAcHVyaS5zbT6JAk4EEwEIADgWIQTyCCuID55C
 OTRobj9QA5jfWrOH0wUCXPSlkwIbAwULCQgHAgYVCAkKCwIEFgIDAQIeAQIXgAAKCRBQA5jf
 WrOH06/FEACC/GTz88DOdWR5JgghjtOhaW+EfpFMquJaZwhsaVips7ttkTKbf95rzunhkf2e
 8YSalWfmyDzZlf/LKUTcmJZHeU7GAj/hBmxeKxo8yPWIQRQE74OEx5MrwPzL6X7LKzWYt4PT
 66bCD7896lhmsMP/Fih2SLKUtL0q41J2Ju/gFwQ6s7klxqZkgTJChKp4GfQrBSChVyYxSyYG
 UtjS4fTFQYfDKTqwXIZQgIt9tHz4gthJk4a6ZX/b68mRd11GAmFln8yA1WLYCQCYw+wsvCZ0
 Ua7gr6YANkMY91JChnezfHW/u/xZ1cCjNP2wpTf4eTMsV1kxW6lkoJRQv643PqzRR2rJPEaS
 biyg7AFZWza/z7rMB5m7r3wN7BKKAj7Lvt+xoLcncx4jLjgSlROtyRTrctBFXT7cIhcGWHw+
 Ib42JF0u96OlPYhRsaIVS3KaD40jMrXf6IEsQw3g6DnuRb2t5p61OX/d9AIcExyYwbdStENN
 gW9RurhmvW3z9gxvFEByjRE+uVoVuVPsZXwAZqFMi/iK4zRfnjdINYMcxKpjhj8vUdBDtZH3
 IpgcI8NemE3B3w/7d3aPjIBz3Igo5SJ3x9XX4hfiWXMU3cT7b5kPcqEN0uAW5RmTA/REC956
 rzZYU7WnSgkM8E8xetz5YuqpNeAmi4aeTPiKDo6By8vfJbkCDQRVC32QARAAxTazPZ9jfp6u
 C+BSiItjwkrFllNEVKptum98JJovWp1kibM+phl6iVo+wKFesNsm568viM2CAzezVlMr7F0u
 6NQNK6pu084W9yHSUKROFFr83Uin6t04U88tcCiBYLQ5G+TrVuGX/5qY1erVWI4ycdkqQzb8
 APbMFrW/sRb781f8wGXWhDs6Bd4PNYKHv7C0r8XYo77PeSqGSV/55lpSsmoE2+zR3MW5TVoa
 E83ZxhfqgtTIWMf88mg/20EIhYCRG0iOmjXytWf++xLm9xpMeKnKfWXQxRbfvKg3+KzF30A0
 hO3YByKENYnwtSBz8od32N7onG5++azxfuhYZG5MkaNeJPLKPQpyGMc2Ponp0BhCZTvxIbI8
 1ZeX6TC+OZbeW+03iGnC7Eo4yJ93QUkzWFOhGGEx0FHj+qBkDQLsREEYwsdxqqr9k1KUD1GF
 VDl0gzuKqiV4YjlJiFfHh9fbTDztr3Nl/raWNNxA3MtX9nstOr7b+PoA4gH1GXL9YSlXdfBP
 VnrhgpuuJYcqLy02i3/90Ukii990nmi5CzzhBVFwNjsZTXw7NRStIrPtKCa+eWRCOzfaOqBU
 KfmzXEHgMl4esqkyFu2MSvbR6clIVajkBmc4+dEgv13RJ9VWW6qNdQw7qTbDJafgQUbmOUMI
 ygDRjCAL2st/LiAi2MWgl80AEQEAAYkCHwQYAQIACQUCVQt9kAIbDAAKCRBQA5jfWrOH0wSZ
 EACpfQPYFL4Ii4IpSujqEfb1/nL+Mi+3NLrm8Hp3i/mVgMrUwBd4x0+nDxc7+Kw/IiXNcoQB
 Q3NC1vsssJ6D+06JOnGJWB9QwoyELGdQ7tSWna405rwDxcsynNnXDT0d39QwFN2nXCyys+7+
 Pri5gTyOByJ+E52F27bX29L05iVSRREVe1zLLjYkFQ4LDNStUp/camD6FOfb+9uVczsMoTZ1
 do2QtjJMlRlhShGz3GYUw52haWKfN3tsvrIHjZf2F5AYy5zOEgrf8O3jm2LDNidin830+UHb
 aoJVibCTJvdbVqp/BlA1IKp1s/Y88ylSgxDFwFuXUElJA9GlmNHAzZBarPEJVkYBTHpRtIKp
 wqmUTH/yH0pzdt8hitI+RBDYynYn0nUxiLZUPAeM5wRLt1XaQ2QDc0QJR8VwBCVSe8+35gEP
 dO/QmrleN5iA3qOHMW8XwXJokd7MaS6FJKGdFjjZPDMR4Qi8PTn2Lm1NkDHpEtaEjjKmdrt/
 4OpE6fV4iKtC1kcvOtvqxNXzmFn9yabHVlbMwTY2TxF8ImfZvr/1Sdzbs6yziasNRfxTGmmY
 G2rmB/XO6AMdal5ewWDFfVmIiRoiVdMSuVM6QxrDnyCfP7W8D0rOqTWQwCWrWv///vz8vfTb
 WlN21GIcpbgBmf9lB8oBpLsmZyXNplhQVmFlorkCDQRc9Ka1ARAA1/asLtvTrK+nr7e93ZVN
 xLIfNO4L70TlBQEjUdnaOetBWQoZNH1/vaq84It4ZNGnd0PQ4zCkW+Z90tMftZIlbL2NAuT1
 iQ6INnmgnOpfNgEag2/Mb41a57hfP9TupWL5d2zOtCdfTLTEVwnkvDEx5TVhujxbdrEWLWfx
 0DmrI+jLbdtCene7kDV+6IYKDMdXKVyTzHGmtpn5jZnXqWN4FOEdjQ0IPHOlc1BT0lpMgmT6
 cSMms5pH3ZYf9tHG94XxKSpRpeemTTNfMUkFItU6+gbw9GIox6Vqbv6ZEv0PAhbKPoEjrbrp
 FZw9k0yUepX0e8nr0eD4keQyC6WDWWdDKVyFFohlcBiFRb6BchJKm/+3EKZu4+L1IEtUMEtJ
 Agn1eiA42BODp2OG4FBT/wtHE7CYhHxzyKk/lxxXy2QWGXtCBIK3LPPclMDgYh0x0bosY7bu
 3tX4jiSs0T95IL3Yl4weMClAxQRQYt45EiESWeOBnl8AHV8YDwy+O7uIT2OHpxvdY7YK1gHN
 i5E3yaI0XCXXtyw82LIAOxcCUuMkuNMsBOtBM3gHDourxrNnYxZEDP6UcoJn3fTyevRBqMRa
 QwUSHuo0x6yvjzY2HhOHzrg3Qh7XLn8mxIr/z82kn++cD/q3ewEe6uAXkt7I12MR0jbihGwb
 8KZWlwK9rYAtfCMAEQEAAYkEcgQYAQgAJhYhBPIIK4gPnkI5NGhuP1ADmN9as4fTBQJc9Ka1
 AhsCBQkDwmcAAkAJEFADmN9as4fTwXQgBBkBCAAdFiEER3IIz/s0aDIAhj4GfiztzT9UrIUF
 Alz0prUACgkQfiztzT9UrIUfiBAAt3N8bUUH2ZQahtVO2CuEiHyc3H0f8BmEVGzvnDcmoJEf
 H6uS/0kF0Y05aX+U6oYg/E9VWztA6E6guC7Bz9zr6fYZaLnDefzkuDRQAzZzBNpxcUrJheOk
 YDAa/8fORIQXJO12DSOq4g9X2RSqIcmQgx2/KoW4UG3e4OArqgMS7ESDT6uT1WFcscfqjPJX
 jXKIH3tg/aJ7ZDkGMFanYsDaiII1ZKpor9WZAsfImPi0n2UZSNEZZtXoR6rtp4UT+O3QrMrn
 MZQlOBkv2HDq1Fe1PXMiFst5kAUcghIebyHdRhQABI7rLFeUqHoEVGuAyuayTsVNecMse7pF
 O44otpwFZe+5eDTsEihY1LeWuXIkjBgo0kmNTZOTwjNeL2aDdpZzN70H4Ctv6+r24248RFMi
 y1YUosIG/Un6OKY4hVShLuXOqsUL41j4UJKRClHEWEIFFUhUgej3Ps1pUxLVOI+ukhAUJwWw
 BagsKq/Gb8T/AhH3noosCHBXeP5ZyT5vMmHk2ZvwwWQnUJVHBAv2e9pXoOWMepyaTs/N9u4u
 3HG3/rYSnYFjgl4wzPZ73QUvCxEYfJi9V4Yzln+F9hK6hKj3bKHAQivx+E3NvFuIIM1adiRh
 hQClh2MaZVy94xU6Sftl9co3BsilV3H7wrWd5/vufZlZDtHmPodae7v5AFmavrIXFxAAsm4Z
 OwwzhG6iz+9mGakJBWjXEKxnAotuI2FCLWZV/Zs8tfhkbeqYFO8Vlz3o0sj+r63sWFkVTXOb
 X7jCQUwW7HXEdMaCaDfC6NUkkKT1PJIBC+kpcVPSq4v/Nsn+yg+K+OGUbHjemhjvS77ByZrN
 /IBZOm94DSYgZQJRTmTVYd96G++2dMPOaUtWjqmCzu3xOfpluL1dR19qCZjD1+mAx5elqLi7
 BrZgJOUjmUb/XI/rDLBpoFQ/6xNJuDA4UTi1d+eEZecOEu7mY1xBQkvKNXL6esqx7ldieaLN
 Af4wUksA+TEUl2XPu84pjLMUbm0FA+sUnGvMkhCn8YdQtEbcgNYq4eIlOjHW+h7zU2G5/pm+
 FmxNAJx7iiXaUY9KQ3snoEz3r37RxEDcvTY9KKahwxEzk2Mf58OPVaV4PEsRianrmErSUfmp
 l93agbtZK1r5LaxeItFOj+O2hWFLNDenJRlBYwXwlJCiHxM/O273hZZPoP8L5p54uXhaS5EJ
 uV2Xzgbi3VEbw3GZr+EnDC7XNE2wUrnlD/w2W6RzVYjVT6IX4SamNlV+MWX0/1fYCutfqZl8
 6BSKmJjlWpfkPKzyzjhGQVZrTZYnKAu471hRv8/6Dx5JuZJgDCnYanNx3DDreRMu/nq6TfaO
 ekMtxgNYb/8oDry09UFHbGHLsWn6oBo=
Message-ID: <125ea3a6-43d3-1610-0708-c7c9727e04de@puri.sm>
Date:   Sun, 5 Apr 2020 13:43:25 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
 Thunderbird/68.6.0
In-Reply-To: <20200319100207.19957-1-martin.kepplinger@puri.sm>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 19.03.20 11:02, Martin Kepplinger wrote:
> The DRD module calls dwc3_set_mode() on role switches, i.e. when a device is
> being plugged in. In order to support continuous runtime power management when
> plugging in / unplugging a cable, we need to call pm_runtime_get_sync() in
> this path.
> 
> Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
> ---
> 
> 
> revision history
> ----------------
> v3: call pm_runtime_get_sync() and fix commit message typo (thanks Sergei)
> v2: move pm_rumtime calls into workqueue (thanks Roger)
>     remove unrelated documentation patch
>     https://lore.kernel.org/linux-usb/7a085229-68a7-d700-1781-14225863a228@cogentembedded.com/T/
> v1: https://lore.kernel.org/linux-usb/ef22f8de-9bfd-c1d5-111c-696f1336dbda@puri.sm/T/
> 
> 
>  drivers/usb/dwc3/core.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 1d85c42b9c67..da93faef74a6 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -121,17 +121,19 @@ static void __dwc3_set_mode(struct work_struct *work)
>  	if (dwc->dr_mode != USB_DR_MODE_OTG)
>  		return;
>  
> +	pm_runtime_get_sync(dwc->dev);
> +
>  	if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_OTG)
>  		dwc3_otg_update(dwc, 0);
>  
>  	if (!dwc->desired_dr_role)
> -		return;
> +		goto out;
>  
>  	if (dwc->desired_dr_role == dwc->current_dr_role)
> -		return;
> +		goto out;
>  
>  	if (dwc->desired_dr_role == DWC3_GCTL_PRTCAP_OTG && dwc->edev)
> -		return;
> +		goto out;
>  
>  	switch (dwc->current_dr_role) {
>  	case DWC3_GCTL_PRTCAP_HOST:
> @@ -190,6 +192,9 @@ static void __dwc3_set_mode(struct work_struct *work)
>  		break;
>  	}
>  
> +out:
> +	pm_runtime_mark_last_busy(dwc->dev);
> +	pm_runtime_put_autosuspend(dwc->dev);
>  }
>  
>  void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
> 

any objections or other thoughts about this? I'm using it successfully.

thanks,

                           martin