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Mon, 17 Aug 2020 00:46:49 -0700 (PDT) Date: Mon, 17 Aug 2020 13:15:01 +0530 From: Vaibhav Gupta To: Sam Ravnborg Message-ID: <20200817074501.GC5869@gmail.com> References: <20200810165458.GA292825@ravnborg.org> <20200810185723.15540-1-vaibhavgupta40@gmail.com> <20200810185723.15540-2-vaibhavgupta40@gmail.com> <20200816201601.GA1426650@ravnborg.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200816201601.GA1426650@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 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 Sun, Aug 16, 2020 at 10:16:01PM +0200, Sam Ravnborg wrote: > Hi Vaibhav > > On Tue, Aug 11, 2020 at 12:27:12AM +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. > > > > Although the gxfb driver does not have that extra load, > Sorry, but I am lost here. > If this drivers does not have the extra load that you describe here then > I really cannot see why it is relevant for this driver to describe it. > > This is a seldomly touched driver - so it helps if the changelog when we > finally touch the code is easy to parse. > > > we should switch to > > the new generic framework by updating function signatures and define a > > "struct dev_pm_ops" variable to bind PM callbacks so that we can remove > > the legacy .suspend & .resume bindings. > This part matches the patch - good. > > > Additionally, this helps us to > > remove the unnecessary call to gxfb_suspend() in the event of Freeze and > > Hibernate, as the function does nothing in their case. > What I think you are explaining above is that the pci pm support > will only call the suspend operation in case of suspend, so the > state.event == PM_EVENT_SUSPEND can be dropped in gxfb_suspend(). > > For reference later I would prefer that this is explained a bit > more explicit - not that the changelog needs update anyway. > > > > Signed-off-by: Vaibhav Gupta > Patch looks good, but please give the changelog one more go. > I have not checked other patches - but I assume they would benefit > from a similar clarification. > > Sam > Hello Sam I will do the changes as suggested. Thanks 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