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Mon, 17 Aug 2020 00:48:13 -0700 (PDT) Date: Mon, 17 Aug 2020 13:16:34 +0530 From: Vaibhav Gupta To: Sam Ravnborg Message-ID: <20200817074634.GD5869@gmail.com> References: <20200810165458.GA292825@ravnborg.org> <20200810185723.15540-1-vaibhavgupta40@gmail.com> <20200810185723.15540-10-vaibhavgupta40@gmail.com> <20200816202442.GB1426650@ravnborg.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200816202442.GB1426650@ravnborg.org> Cc: linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, Antonino Daplas , Bartlomiej Zolnierkiewicz , Vaibhav Gupta , Russell King , dri-devel@lists.freedesktop.org, linux-geode@lists.infradead.org, Bjorn Helgaas , Andres Salomon , Bjorn Helgaas , Paul Mackerras , linux-kernel-mentees@lists.linuxfoundation.org, linux-arm-kernel@lists.infradead.org Subject: Re: [Linux-kernel-mentees] [PATCH v2 09/12] fbdev: i740fb: use generic power management X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" On Sun, Aug 16, 2020 at 10:24:42PM +0200, Sam Ravnborg wrote: > Hi Vaibhav > > On Tue, Aug 11, 2020 at 12:27:20AM +0530, Vaibhav Gupta wrote: > > Drivers should do only device-specific jobs. But in general, drivers using > > legacy PCI PM framework for .suspend()/.resume() have to manage many PCI > > PM-related tasks themselves which can be done by PCI Core itself. This > > brings extra load on the driver and it directly calls PCI helper functions > > to handle them. > > > > Switch to the new generic framework by updating function signatures and > > define a "struct dev_pm_ops" variable to bind PM callbacks. Also, remove > > unnecessary calls to the PCI Helper functions along with the legacy > > .suspend & .resume bindings. > > > > Signed-off-by: Vaibhav Gupta > > I several of the drivers I briefly looked at a new set of helpers were > introduced for the different types of pm actions. > They then called a more generic function that uses the passes > enumeration to decide what to do. > > But in this driver the test "state.event == PM_EVENT_FREEZE" is dropped > and there is no freeze operation. > Please explain this change so the reader is not left wondering. > > Sam > Okay, Thanks Vaibhav Gupta > > --- > > drivers/video/fbdev/i740fb.c | 40 +++++++++++++++--------------------- > > 1 file changed, 16 insertions(+), 24 deletions(-) > > > > diff --git a/drivers/video/fbdev/i740fb.c b/drivers/video/fbdev/i740fb.c > > index c65ec7386e87..8d7f06fc8a5a 100644 > > --- a/drivers/video/fbdev/i740fb.c > > +++ b/drivers/video/fbdev/i740fb.c > > @@ -1175,16 +1175,11 @@ static void i740fb_remove(struct pci_dev *dev) > > } > > } > > > > -#ifdef CONFIG_PM > > -static int i740fb_suspend(struct pci_dev *dev, pm_message_t state) > > +static int __maybe_unused i740fb_suspend(struct device *dev) > > { > > - struct fb_info *info = pci_get_drvdata(dev); > > + struct fb_info *info = dev_get_drvdata(dev); > > struct i740fb_par *par = info->par; > > > > - /* don't disable console during hibernation and wakeup from it */ > > - if (state.event == PM_EVENT_FREEZE || state.event == PM_EVENT_PRETHAW) > > - return 0; > > - > > console_lock(); > > mutex_lock(&(par->open_lock)); > > > > @@ -1197,19 +1192,15 @@ static int i740fb_suspend(struct pci_dev *dev, pm_message_t state) > > > > fb_set_suspend(info, 1); > > > > - pci_save_state(dev); > > - pci_disable_device(dev); > > - pci_set_power_state(dev, pci_choose_state(dev, state)); > > - > > mutex_unlock(&(par->open_lock)); > > console_unlock(); > > > > return 0; > > } > > > > -static int i740fb_resume(struct pci_dev *dev) > > +static int __maybe_unused i740fb_resume(struct device *dev) > > { > > - struct fb_info *info = pci_get_drvdata(dev); > > + struct fb_info *info = dev_get_drvdata(dev); > > struct i740fb_par *par = info->par; > > > > console_lock(); > > @@ -1218,11 +1209,6 @@ static int i740fb_resume(struct pci_dev *dev) > > if (par->ref_count == 0) > > goto fail; > > > > - pci_set_power_state(dev, PCI_D0); > > - pci_restore_state(dev); > > - if (pci_enable_device(dev)) > > - goto fail; > > - > > i740fb_set_par(info); > > fb_set_suspend(info, 0); > > > > @@ -1231,10 +1217,17 @@ static int i740fb_resume(struct pci_dev *dev) > > console_unlock(); > > return 0; > > } > > -#else > > -#define i740fb_suspend NULL > > -#define i740fb_resume NULL > > -#endif /* CONFIG_PM */ > > + > > +static const struct dev_pm_ops i740fb_pm_ops = { > > +#ifdef CONFIG_PM_SLEEP > > + .suspend = i740fb_suspend, > > + .resume = i740fb_resume, > > + .freeze = NULL, > > + .thaw = i740fb_resume, > > + .poweroff = i740fb_suspend, > > + .restore = i740fb_resume, > > +#endif /* CONFIG_PM_SLEEP */ > > +}; > > > > #define I740_ID_PCI 0x00d1 > > #define I740_ID_AGP 0x7800 > > @@ -1251,8 +1244,7 @@ static struct pci_driver i740fb_driver = { > > .id_table = i740fb_id_table, > > .probe = i740fb_probe, > > .remove = i740fb_remove, > > - .suspend = i740fb_suspend, > > - .resume = i740fb_resume, > > + .driver.pm = &i740fb_pm_ops, > > }; > > > > #ifndef MODULE > > -- > > 2.27.0 _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees