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[23.128.96.18]) by mx.google.com with ESMTP id mb5si1296518ejb.206.2020.08.10.02.44.02; Mon, 10 Aug 2020 02:44:26 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=BhHI6QrI; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726815AbgHJJld (ORCPT + 99 others); Mon, 10 Aug 2020 05:41:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39538 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725809AbgHJJlc (ORCPT ); Mon, 10 Aug 2020 05:41:32 -0400 Received: from mail-pl1-x641.google.com (mail-pl1-x641.google.com [IPv6:2607:f8b0:4864:20::641]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 79B09C061756; Mon, 10 Aug 2020 02:41:32 -0700 (PDT) Received: by mail-pl1-x641.google.com with SMTP id f5so541595plr.9; Mon, 10 Aug 2020 02:41:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=z3ulW2VxpkqtQgW6r5h1dF3y8SsTkgQ0jTlNBIbDSYs=; b=BhHI6QrI59CCp9aOeqg0rtMs2ISonD+r8bVrNsB10xf3Chv8koFMrz9OE8b6a5acs8 558t3l2AnmWvtVKfOJceNXRhuk53EWvBOUZT97b3bWvOPCPwbJKCiO01meo0M1gWnJqQ Cg9RhFCRr1SdRa3ZewFFTkx7Qq0s2NLpSBDxdyOr45J/Sgmf0764JOoJofb5Hy+wxhnP ivzrBRmxYCbcDZ4Qo0WI5YJuWvk+aycAdYyaIKXvUtF9Cawlix6ruh/5cnRZrRaIQTdB zgAFuCYU35QSQ/BD8/VzLKiHfOWznMZK31lEEKIW24+HyVTBtxyFaDxIwDY0SbSmSJDH dDhw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=z3ulW2VxpkqtQgW6r5h1dF3y8SsTkgQ0jTlNBIbDSYs=; b=KNbVxzjELDlYh7ivumi17/XkSoJ+/gP8l2A6AHJtw1w9vSGTFVHg+JeiO8PIsx/wd+ S8il2NUiYyIecSXxE6iJvGxYVkWYWOkk9AMoxHxQSEQNjxltO533zesFtaXq7CWQR8s3 dsqcfIVbbkl4wZzO/KeQqipT06GwvztynWJivHGCWhspPC2ErLpH3L/H/EPZEJx6xWvI WJPyhzLvp7a6pjN+NcakwBpvQQAjXi3NV29Irv1vrrR4OunAwRKBizndIdFsju+jJ9I3 uoZgcqgDI2ZF3Ma7fyLZhJcUQTDD042wRm1uR9uzY8a2HjBjlzfBLDKwju9kWPqQtyNO 20ig== X-Gm-Message-State: AOAM530YhPK6VmSgIc9LH684DQdambfGfAo2esSP+Nk6YEj+BSaKbC8D hVq9YgJD92e2BzvL9mrCNK0= X-Received: by 2002:a17:90b:e83:: with SMTP id fv3mr25419713pjb.193.1597052491734; Mon, 10 Aug 2020 02:41:31 -0700 (PDT) Received: from gmail.com ([103.105.152.86]) by smtp.gmail.com with ESMTPSA id o4sm13500555pjs.51.2020.08.10.02.41.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Aug 2020 02:41:31 -0700 (PDT) Date: Mon, 10 Aug 2020 15:09:48 +0530 From: Vaibhav Gupta To: Sam Ravnborg Cc: Bjorn Helgaas , Bjorn Helgaas , Bjorn Helgaas , Vaibhav Gupta , Bartlomiej Zolnierkiewicz , Paul Mackerras , Russell King , Andres Salomon , Antonino Daplas , Florian Tobias Schandinat , linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-geode@lists.infradead.org, Shuah Khan , linux-kernel-mentees@lists.linuxfoundation.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v1 01/12] fbdev: gxfb: use generic power management Message-ID: <20200810093948.GB6615@gmail.com> References: <20200805180722.244008-1-vaibhavgupta40@gmail.com> <20200805180722.244008-2-vaibhavgupta40@gmail.com> <20200808111746.GA24172@ravnborg.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20200808111746.GA24172@ravnborg.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Aug 08, 2020 at 01:17:46PM +0200, Sam Ravnborg wrote: > Hi Vaibhav > > 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. > > > > Switch to generic power management framework using a single > > "struct dev_pm_ops" variable > > "to take the unnecessary load from the driver." > - I do not parse the above - I cannot see what load is removed. > But the code is simpler which is fine. The drawback is that we now > always link in the suspend_gx functions but hopefultl the linker drops > them later. > > > 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. > Again, I do not see what calles are removed. > A single check for the state is dropped - anything else? > Yeah, the commit messages are bit misleading, I have modified them. > > > > 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); > I do not see any dev_set_drvdata() so I guess we get a NULL pointer > here which is not intended. > Adding a dev_set_data() to gxfb_probe() would do the trick. > gxfb_probe() invokes pci_set_drvdata(pdev, info) which in turn calls dev_set_drvdata(&pdev->dev, data). Adding dev_get_drvdata() will be redundant. > > > > - 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 > > +}; > Can we use SET_SYSTEM_SLEEP_PM_OPS here? > .freeze will be assigned gxfb_suspend, but gxfb_suspend will anyway be > called as far as I read the code. > Likewise for poweroff. > Earlier, gxfb_suspend() performed each operation just for suspend event. And as it was legacy code, it was invoked by pci_legacy_suspend() for pci_pm_suspend(), pci_pm_freeze() and pci_pm_poweroff(). Thus, the code was wrapped inside "if" container: if (state.event == PM_EVENT_SUSPEND) { } After binding it with dev_pm_ops variable, pm->suspend() is invoked by just pci_pm_suspend() which is required. So I removed the "if" container and bind the callback with pm->suspend pointer only. Using SET_SYSTEM_PM_OPS will bring back the extra step of invoking gxfb_suspend() for freeze and poweroff, even though the function will do nothing in that case. Vaibhav Gupta > Sam > > > + > > 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 > > > > _______________________________________________ > > dri-devel mailing list > > dri-devel@lists.freedesktop.org > > https://lists.freedesktop.org/mailman/listinfo/dri-devel