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Wed, 05 Aug 2020 23:00:38 -0700 (PDT) Date: Thu, 6 Aug 2020 11:29:06 +0530 From: Vaibhav Gupta To: Bjorn Helgaas Message-ID: <20200806055843.GA486683@gmail.com> References: <20200805180722.244008-2-vaibhavgupta40@gmail.com> <20200805201901.GA529929@bjorn-Precision-5520> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200805201901.GA529929@bjorn-Precision-5520> Cc: linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, Antonino Daplas , Bartlomiej Zolnierkiewicz , Vaibhav Gupta , Florian Tobias Schandinat , Russell King , dri-devel@lists.freedesktop.org, linux-geode@lists.infradead.org, Paul Mackerras , Andres Salomon , Bjorn Helgaas , linux-kernel-mentees@lists.linuxfoundation.org, linux-arm-kernel@lists.infradead.org Subject: Re: [Linux-kernel-mentees] [PATCH v1 01/12] fbdev: gxfb: 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 Wed, Aug 05, 2020 at 03:19:01PM -0500, Bjorn Helgaas wrote: > On Wed, Aug 05, 2020 at 11:37:11PM +0530, Vaibhav Gupta wrote: > > Drivers using legacy power management .suspen()/.resume() callbacks > > have to manage PCI states and device's PM states themselves. They also > > need to take care of standard configuration registers. > > s/using legacy/using legacy PCI/ > s/.suspen/.suspend/ (in all these patches) > Oh, that's a blunder. Since most of the drivers in my project need similar changes, I made a template for commit message. And by mistake I would have edited the template itself. > I wouldn't necessarily repost the whole series just for that (unless > the maintainer wants it), but maybe update your branch so if you have > occasion to repost for other reasons, this will be fixed. > > This particular driver actually doesn't *do* any of the PCI state or > device PM state management you mention. And I don't see the "single > 'struct dev_pm_ops'" you mention below -- I thought that meant you > would have a single struct shared between drivers (I think you did > that for IDE?), but that's not what you're doing. This driver has > gxfb_pm_ops, the next has lxfb_pm_ops, etc. > Yeah, the sentence sounds misleading. What I meant was that earlier there were two pointers for PM, .suspend and .resume. Whereas now there is a single "struct dev_pm_ops" variable inside pci_driver. > AFAICT the patches are fine, but the commit logs don't seem exactly > accurate. > I am fixing it. Thanks Vaibhav Gupta > > Switch to generic power management framework using a single > > "struct dev_pm_ops" variable to take the unnecessary load from the driver. > > This also avoids the need for the driver to directly call most of the PCI > > helper functions and device power state control functions, as through > > the generic framework PCI Core takes care of the necessary operations, > > and drivers are required to do only device-specific jobs. > > > > Signed-off-by: Vaibhav Gupta > > --- > > drivers/video/fbdev/geode/gxfb.h | 5 ---- > > drivers/video/fbdev/geode/gxfb_core.c | 36 ++++++++++++++------------ > > drivers/video/fbdev/geode/suspend_gx.c | 4 --- > > 3 files changed, 20 insertions(+), 25 deletions(-) > > > > diff --git a/drivers/video/fbdev/geode/gxfb.h b/drivers/video/fbdev/geode/gxfb.h > > index d2e9c5c8e294..792c111c21e4 100644 > > --- a/drivers/video/fbdev/geode/gxfb.h > > +++ b/drivers/video/fbdev/geode/gxfb.h > > @@ -21,7 +21,6 @@ struct gxfb_par { > > void __iomem *dc_regs; > > void __iomem *vid_regs; > > void __iomem *gp_regs; > > -#ifdef CONFIG_PM > > int powered_down; > > > > /* register state, for power management functionality */ > > @@ -36,7 +35,6 @@ struct gxfb_par { > > uint64_t fp[FP_REG_COUNT]; > > > > uint32_t pal[DC_PAL_COUNT]; > > -#endif > > }; > > > > unsigned int gx_frame_buffer_size(void); > > @@ -49,11 +47,8 @@ void gx_set_dclk_frequency(struct fb_info *info); > > void gx_configure_display(struct fb_info *info); > > int gx_blank_display(struct fb_info *info, int blank_mode); > > > > -#ifdef CONFIG_PM > > int gx_powerdown(struct fb_info *info); > > int gx_powerup(struct fb_info *info); > > -#endif > > - > > > > /* Graphics Processor registers (table 6-23 from the data book) */ > > enum gp_registers { > > diff --git a/drivers/video/fbdev/geode/gxfb_core.c b/drivers/video/fbdev/geode/gxfb_core.c > > index d38a148d4746..44089b331f91 100644 > > --- a/drivers/video/fbdev/geode/gxfb_core.c > > +++ b/drivers/video/fbdev/geode/gxfb_core.c > > @@ -322,17 +322,14 @@ static struct fb_info *gxfb_init_fbinfo(struct device *dev) > > return info; > > } > > > > -#ifdef CONFIG_PM > > -static int gxfb_suspend(struct pci_dev *pdev, pm_message_t state) > > +static int __maybe_unused gxfb_suspend(struct device *dev) > > { > > - struct fb_info *info = pci_get_drvdata(pdev); > > + struct fb_info *info = dev_get_drvdata(dev); > > > > - if (state.event == PM_EVENT_SUSPEND) { > > - console_lock(); > > - gx_powerdown(info); > > - fb_set_suspend(info, 1); > > - console_unlock(); > > - } > > + console_lock(); > > + gx_powerdown(info); > > + fb_set_suspend(info, 1); > > + console_unlock(); > > > > /* there's no point in setting PCI states; we emulate PCI, so > > * we don't end up getting power savings anyways */ > > @@ -340,9 +337,9 @@ static int gxfb_suspend(struct pci_dev *pdev, pm_message_t state) > > return 0; > > } > > > > -static int gxfb_resume(struct pci_dev *pdev) > > +static int __maybe_unused gxfb_resume(struct device *dev) > > { > > - struct fb_info *info = pci_get_drvdata(pdev); > > + struct fb_info *info = dev_get_drvdata(dev); > > int ret; > > > > console_lock(); > > @@ -356,7 +353,6 @@ static int gxfb_resume(struct pci_dev *pdev) > > console_unlock(); > > return 0; > > } > > -#endif > > > > static int gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id) > > { > > @@ -467,15 +463,23 @@ static const struct pci_device_id gxfb_id_table[] = { > > > > MODULE_DEVICE_TABLE(pci, gxfb_id_table); > > > > +static const struct dev_pm_ops gxfb_pm_ops = { > > +#ifdef CONFIG_PM_SLEEP > > + .suspend = gxfb_suspend, > > + .resume = gxfb_resume, > > + .freeze = NULL, > > + .thaw = gxfb_resume, > > + .poweroff = NULL, > > + .restore = gxfb_resume, > > +#endif > > +}; > > + > > static struct pci_driver gxfb_driver = { > > .name = "gxfb", > > .id_table = gxfb_id_table, > > .probe = gxfb_probe, > > .remove = gxfb_remove, > > -#ifdef CONFIG_PM > > - .suspend = gxfb_suspend, > > - .resume = gxfb_resume, > > -#endif > > + .driver.pm = &gxfb_pm_ops, > > }; > > > > #ifndef MODULE > > diff --git a/drivers/video/fbdev/geode/suspend_gx.c b/drivers/video/fbdev/geode/suspend_gx.c > > index 1110a527c35c..8c49d4e98772 100644 > > --- a/drivers/video/fbdev/geode/suspend_gx.c > > +++ b/drivers/video/fbdev/geode/suspend_gx.c > > @@ -11,8 +11,6 @@ > > > > #include "gxfb.h" > > > > -#ifdef CONFIG_PM > > - > > static void gx_save_regs(struct gxfb_par *par) > > { > > int i; > > @@ -259,5 +257,3 @@ int gx_powerup(struct fb_info *info) > > par->powered_down = 0; > > return 0; > > } > > - > > -#endif > > -- > > 2.27.0 > > _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees