From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: usb: typec: tcpm: Export partner Source Capabilities From: Greg Kroah-Hartman Message-Id: <20190214143020.GA1317@kroah.com> Date: Thu, 14 Feb 2019 15:30:20 +0100 To: Adam Thomson Cc: Guenter Roeck , Kyle Tso , Heikki Krogerus , Badhri Jagan Sridharan , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" List-ID: T24gVGh1LCBGZWIgMTQsIDIwMTkgYXQgMDI6MTc6MTRQTSArMDAwMCwgQWRhbSBUaG9tc29uIHdy b3RlOgo+IE9uIDEyIEZlYnJ1YXJ5IDIwMTkgMTY6MjAsIEd1ZW50ZXIgUm9lY2sgd3JvdGU6Cj4g Cj4gPiBPbiAyLzEyLzE5IDI6NTQgQU0sIEdyZWcgS0ggd3JvdGU6Cj4gPiA+IE9uIFR1ZSwgRmVi IDEyLCAyMDE5IGF0IDA2OjI5OjM5UE0gKzA4MDAsIEt5bGUgVHNvIHdyb3RlOgo+ID4gPj4gT24g VGh1LCBKYW4gMzEsIDIwMTkgYXQgMzowMiBQTSBHcmVnIEtIIDxncmVna2hAbGludXhmb3VuZGF0 aW9uLm9yZz4KPiA+IHdyb3RlOgo+ID4gPj4KPiA+ID4+PiBPbiBUaHUsIEphbiAzMSwgMjAxOSBh 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"linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] usb: typec: tcpm: Export partner Source Capabilities Message-ID: <20190214143020.GA1317@kroah.com> References: <20190131035411.53576-1-kyletso@google.com> <20190131070238.GA4500@kroah.com> <20190212105421.GA23271@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.11.3 (2019-02-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 14, 2019 at 02:17:14PM +0000, Adam Thomson wrote: > On 12 February 2019 16:20, Guenter Roeck wrote: > > > On 2/12/19 2:54 AM, Greg KH wrote: > > > On Tue, Feb 12, 2019 at 06:29:39PM +0800, Kyle Tso wrote: > > >> On Thu, Jan 31, 2019 at 3:02 PM Greg KH > > wrote: > > >> > > >>> On Thu, Jan 31, 2019 at 11:54:11AM +0800, Kyle Tso wrote: > > >>>> Provide a function to get the partner Source Capabilities. > > >>>> > > >>>> Signed-off-by: Kyle Tso > > >>>> --- > > >>>> drivers/usb/typec/tcpm/tcpm.c | 23 +++++++++++++++++++++++ > > >>>> include/linux/usb/tcpm.h | 1 + > > >>>> 2 files changed, 24 insertions(+) > > >>>> > > >>>> diff --git a/drivers/usb/typec/tcpm/tcpm.c > > >>> b/drivers/usb/typec/tcpm/tcpm.c > > >>>> index f1d3e54210df..29cd84ba9960 100644 > > >>>> --- a/drivers/usb/typec/tcpm/tcpm.c > > >>>> +++ b/drivers/usb/typec/tcpm/tcpm.c > > >>>> @@ -4494,6 +4494,29 @@ int tcpm_update_sink_capabilities(struct > > >>> tcpm_port *port, const u32 *pdo, > > >>>> } > > >>>> EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities); > > >>>> > > >>>> +/* > > >>>> + * Don't call this function in interrupt context. Caller needs to > > >>>> +free > > >>> the > > >>>> + * memory itself. > > >>>> + */ > > >>>> +int tcpm_get_partner_src_caps(struct tcpm_port *port, u32 > > >>>> +**src_pdo) { > > >>>> + unsigned int nr_pdo; > > >>>> + > > >>>> + if (port->nr_source_caps == 0) > > >>>> + return -ENODATA; > > >>>> + > > >>>> + *src_pdo = kcalloc(port->nr_source_caps, sizeof(u32), GFP_KERNEL); > > >>>> + if (!src_pdo) > > >>>> + return -ENOMEM; > > >>>> + > > >>>> + mutex_lock(&port->lock); > > >>>> + nr_pdo = tcpm_copy_pdos(*src_pdo, port->source_caps, > > >>>> + port->nr_source_caps); > > >>>> + mutex_unlock(&port->lock); > > >>>> + return nr_pdo; > > >>>> +} > > >>>> +EXPORT_SYMBOL_GPL(tcpm_get_partner_src_caps); > > >>> > > >>> We don't add new functions that no one uses :( > > >>> > > >>> > > >> This function is useful if the PD Device Policy Manager is > > >> implemented outside of TCPM. > > >> In this situation, Device Policy Manager needs to know the partner > > >> capabilities to optimize the charging process. > > > > > > And where is that code? > > > > > > > Agreed - that code should be sent upstream as well to let us see the entire > > context. > > > > >> Take existing functions in TCPM for example: > > >> Function "tcpm_update_sink_capabilities" and > > >> "tcpm_update_source_capabilities" are exposed as well. And no one > > >> uses them now. > > > > > > Great, let's go delete them now, we should not have apis that no one > > > uses. This isn't a new thing... > > > > > > > I sent a patch to do just that. Quite frankly I don't recal why I thought those > > functions might be needed. > > As a mind jog - https://lkml.org/lkml/2017/11/27/1256 :) Nice find :) Given that no one used these functions in over a year, we should be safe deleting them. If not, it's trivial to do 'git revert'. thanks, greg k-h