From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> To: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Cc: Oliver Schinagl <oliver-dxLnbx3+1qmEVqv0pETR8A@public.gmane.org>, Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>, Richard Zhu <Hong-Xing.Zhu-KZfg59tc24xl57MIdRCFDg@public.gmane.org>, linux-ide-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org Subject: Re: [RFC v3 03/13] ahci-platform: Fix clk enable/disable unbalance on suspend/resume Date: Mon, 20 Jan 2014 07:26:25 -0500 [thread overview] Message-ID: <20140120122625.GB17155@htj.dyndns.org> (raw) In-Reply-To: <52DC2CF5.5080109-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Hey, On Sun, Jan 19, 2014 at 08:52:21PM +0100, Hans de Goede wrote: > And having ahci_resume in ahci_platform.c still doing the clk and power enabling > before calling into ahci_platform_resume, and drivers overriding the resume method > need to do their own clk + regulator + whatever setup > before calling into ahci_platform_resume_controller ? If the use cases are significant enough, split the base function to two parts? The thing which gets really messy down the road is when common code and callbacks intertwine arbitrarily. A driver wants an early exit after overriding a subpart, so if that callback exists, it's an early exit. The next driver wants to override something at slightly different point but still want to proceed with the rest of the common code, so it adds a new callback which doesn't do early exit, and so on. Pretty soon, when you're looking at a driver, it becomes really difficult what it actually does. We *HAD* this problem over and over again with ide and it was a nightmare. Providing larger, logical overriding points while providing common lib routines makes understanding what a given driver does a lot easier. Also, it forces people to think about how the overall API looks and whether a split of an existing library which require giving the splits sensible names and semantics is justifiable or if the case at hand is an one-off thing which can be better served by just open coding it. > Will get exported from ahci_platform.c and drivers needing to override any of them > will provide their own platform_driver struct, pointing either to their overrides, > or for driver methods they don't need to override to the exported function from > ahci_platform.c ? Yeah, makes sense to me. Thanks. -- tejun
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From: tj@kernel.org (Tejun Heo) To: linux-arm-kernel@lists.infradead.org Subject: [RFC v3 03/13] ahci-platform: Fix clk enable/disable unbalance on suspend/resume Date: Mon, 20 Jan 2014 07:26:25 -0500 [thread overview] Message-ID: <20140120122625.GB17155@htj.dyndns.org> (raw) In-Reply-To: <52DC2CF5.5080109@redhat.com> Hey, On Sun, Jan 19, 2014 at 08:52:21PM +0100, Hans de Goede wrote: > And having ahci_resume in ahci_platform.c still doing the clk and power enabling > before calling into ahci_platform_resume, and drivers overriding the resume method > need to do their own clk + regulator + whatever setup > before calling into ahci_platform_resume_controller ? If the use cases are significant enough, split the base function to two parts? The thing which gets really messy down the road is when common code and callbacks intertwine arbitrarily. A driver wants an early exit after overriding a subpart, so if that callback exists, it's an early exit. The next driver wants to override something at slightly different point but still want to proceed with the rest of the common code, so it adds a new callback which doesn't do early exit, and so on. Pretty soon, when you're looking at a driver, it becomes really difficult what it actually does. We *HAD* this problem over and over again with ide and it was a nightmare. Providing larger, logical overriding points while providing common lib routines makes understanding what a given driver does a lot easier. Also, it forces people to think about how the overall API looks and whether a split of an existing library which require giving the splits sensible names and semantics is justifiable or if the case at hand is an one-off thing which can be better served by just open coding it. > Will get exported from ahci_platform.c and drivers needing to override any of them > will provide their own platform_driver struct, pointing either to their overrides, > or for driver methods they don't need to override to the exported function from > ahci_platform.c ? Yeah, makes sense to me. Thanks. -- tejun
next prev parent reply other threads:[~2014-01-20 12:26 UTC|newest] Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-01-18 23:48 [RFC v3 00/13] ahci: add sunxi driver and cleanup imx driver Hans de Goede 2014-01-18 23:48 ` Hans de Goede [not found] ` <1390088935-7193-1-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-18 23:48 ` [RFC v3 01/13] libahci: Allow drivers to override start_engine Hans de Goede 2014-01-18 23:48 ` Hans de Goede [not found] ` <1390088935-7193-2-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 4:46 ` Tejun Heo 2014-01-19 4:46 ` Tejun Heo [not found] ` <20140119044643.GH3640-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org> 2014-01-19 18:48 ` Hans de Goede 2014-01-19 18:48 ` Hans de Goede 2014-01-18 23:48 ` [RFC v3 02/13] sata-highbank: Remove unnecessary ahci_platform.h include Hans de Goede 2014-01-18 23:48 ` Hans de Goede [not found] ` <1390088935-7193-3-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 11:15 ` Tejun Heo 2014-01-19 11:15 ` Tejun Heo 2014-01-18 23:48 ` [RFC v3 03/13] ahci-platform: Fix clk enable/disable unbalance on suspend/resume Hans de Goede 2014-01-18 23:48 ` Hans de Goede [not found] ` <1390088935-7193-4-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 11:14 ` Tejun Heo 2014-01-19 11:14 ` Tejun Heo [not found] ` <20140119111412.GA11123-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org> 2014-01-19 18:47 ` Hans de Goede 2014-01-19 18:47 ` Hans de Goede [not found] ` <52DC1DAA.3010403-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 19:15 ` Tejun Heo 2014-01-19 19:15 ` Tejun Heo [not found] ` <20140119191554.GB32165-9pTldWuhBndy/B6EtB590w@public.gmane.org> 2014-01-19 19:52 ` Hans de Goede 2014-01-19 19:52 ` Hans de Goede [not found] ` <52DC2CF5.5080109-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-20 12:26 ` Tejun Heo [this message] 2014-01-20 12:26 ` Tejun Heo 2014-01-18 23:48 ` [RFC v3 04/13] ahci-platform: Undo pdata->resume on resume failure Hans de Goede 2014-01-18 23:48 ` Hans de Goede [not found] ` <1390088935-7193-5-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 11:27 ` Tejun Heo 2014-01-19 11:27 ` Tejun Heo [not found] ` <20140119112737.GC11123-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org> 2014-01-19 18:40 ` Hans de Goede 2014-01-19 18:40 ` Hans de Goede [not found] ` <52DC1C15.1030107-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 19:13 ` Tejun Heo 2014-01-19 19:13 ` Tejun Heo [not found] ` <20140119191349.GA32165-9pTldWuhBndy/B6EtB590w@public.gmane.org> 2014-01-19 19:34 ` Hans de Goede 2014-01-19 19:34 ` Hans de Goede [not found] ` <52DC28DB.7070804-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 19:42 ` Tejun Heo 2014-01-19 19:42 ` Tejun Heo [not found] ` <20140119194226.GE32165-9pTldWuhBndy/B6EtB590w@public.gmane.org> 2014-01-19 19:53 ` Hans de Goede 2014-01-19 19:53 ` Hans de Goede 2014-01-18 23:48 ` [RFC v3 05/13] ahci-platform: Pass ahci_host_priv ptr to ahci_platform_data init method Hans de Goede 2014-01-18 23:48 ` Hans de Goede [not found] ` <1390088935-7193-6-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 11:30 ` Tejun Heo 2014-01-19 11:30 ` Tejun Heo [not found] ` <20140119113051.GD11123-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org> 2014-01-19 18:51 ` Hans de Goede 2014-01-19 18:51 ` Hans de Goede [not found] ` <52DC1EC4.3090807-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 19:17 ` Tejun Heo 2014-01-19 19:17 ` Tejun Heo [not found] ` <20140119191706.GC32165-9pTldWuhBndy/B6EtB590w@public.gmane.org> 2014-01-19 19:56 ` Hans de Goede 2014-01-19 19:56 ` Hans de Goede [not found] ` <52DC2DD9.7070403-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-20 12:28 ` Tejun Heo 2014-01-20 12:28 ` Tejun Heo 2014-01-18 23:48 ` [RFC v3 06/13] ahci-platform: Add support for devices with more then 1 clock Hans de Goede 2014-01-18 23:48 ` Hans de Goede [not found] ` <1390088935-7193-7-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 12:38 ` Russell King - ARM Linux 2014-01-19 12:38 ` Russell King - ARM Linux [not found] ` <20140119123854.GP15937-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2014-01-19 19:20 ` Hans de Goede 2014-01-19 19:20 ` Hans de Goede 2014-01-18 23:48 ` [RFC v3 07/13] ahci-platform: Add support for an optional regulator for sata-target power Hans de Goede 2014-01-18 23:48 ` Hans de Goede 2014-01-18 23:48 ` [RFC v3 08/13] ahci-platform: Allow specifying platform_data through of_device_id Hans de Goede 2014-01-18 23:48 ` Hans de Goede [not found] ` <1390088935-7193-9-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 11:38 ` Tejun Heo 2014-01-19 11:38 ` Tejun Heo 2014-01-19 12:30 ` Russell King - ARM Linux 2014-01-19 12:30 ` Russell King - ARM Linux [not found] ` <20140119123055.GO15937-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2014-01-19 13:19 ` Tejun Heo 2014-01-19 13:19 ` Tejun Heo [not found] ` <20140119113838.GE11123-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org> 2014-01-19 18:56 ` Hans de Goede 2014-01-19 18:56 ` Hans de Goede [not found] ` <52DC1FF5.80101-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 19:22 ` Tejun Heo 2014-01-19 19:22 ` Tejun Heo 2014-01-20 8:24 ` Sascha Hauer 2014-01-20 8:24 ` Sascha Hauer [not found] ` <20140120082438.GH16215-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org> 2014-01-20 8:35 ` Hans de Goede 2014-01-20 8:35 ` Hans de Goede 2014-01-20 9:09 ` Sascha Hauer 2014-01-20 9:09 ` Sascha Hauer [not found] ` <20140120090950.GI16215-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org> 2014-01-20 9:17 ` Hans de Goede 2014-01-20 9:17 ` Hans de Goede 2014-01-20 9:57 ` Sascha Hauer 2014-01-20 9:57 ` Sascha Hauer 2014-01-18 23:48 ` [RFC v3 09/13] ARM: sunxi: Add support for Allwinner SUNXi SoCs sata to ahci_platform Hans de Goede 2014-01-18 23:48 ` Hans de Goede 2014-01-19 12:22 ` Russell King - ARM Linux 2014-01-19 12:22 ` Russell King - ARM Linux [not found] ` <20140119122216.GM15937-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2014-01-19 19:07 ` Hans de Goede 2014-01-19 19:07 ` Hans de Goede 2014-01-19 19:56 ` Russell King - ARM Linux 2014-01-19 19:56 ` Russell King - ARM Linux [not found] ` <20140119195642.GU15937-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2014-01-19 20:01 ` Hans de Goede 2014-01-19 20:01 ` Hans de Goede 2014-01-18 23:48 ` [RFC v3 10/13] ahci_imx: Adjust for ahci_platform managing the clocks Hans de Goede 2014-01-18 23:48 ` Hans de Goede [not found] ` <1390088935-7193-11-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 12:41 ` Russell King - ARM Linux 2014-01-19 12:41 ` Russell King - ARM Linux [not found] ` <20140119124134.GQ15937-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2014-01-19 19:30 ` Hans de Goede 2014-01-19 19:30 ` Hans de Goede [not found] ` <52DC27DD.5030309-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 19:32 ` Russell King - ARM Linux 2014-01-19 19:32 ` Russell King - ARM Linux [not found] ` <20140119193258.GT15937-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2014-01-19 19:38 ` Hans de Goede 2014-01-19 19:38 ` Hans de Goede 2014-01-18 23:48 ` [RFC v3 11/13] ahci-imx: Don't create a nested platform device from probe Hans de Goede 2014-01-18 23:48 ` Hans de Goede [not found] ` <1390088935-7193-12-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2014-01-19 12:25 ` Russell King - ARM Linux 2014-01-19 12:25 ` Russell King - ARM Linux [not found] ` <20140119122540.GN15937-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2014-01-19 19:08 ` Hans de Goede 2014-01-19 19:08 ` Hans de Goede 2014-01-18 23:48 ` [RFC v3 12/13] ARM: sun4i: dts: Add ahci / sata support Hans de Goede 2014-01-18 23:48 ` Hans de Goede 2014-01-18 23:48 ` [RFC v3 13/13] ARM: sun7i: " Hans de Goede 2014-01-18 23:48 ` Hans de Goede 2014-01-19 9:52 ` [RFC v3 00/13] ahci: add sunxi driver and cleanup imx driver Russell King - ARM Linux 2014-01-19 9:52 ` Russell King - ARM Linux
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