* [PATCH 0/4] improved support for runtime muxing for pinctrl @ 2013-07-16 9:05 Tony Lindgren 2013-07-16 9:05 ` [PATCH 1/4] pinctrl: Remove duplicate code in pinctrl_pm_select_state functions Tony Lindgren ` (5 more replies) 0 siblings, 6 replies; 40+ messages in thread From: Tony Lindgren @ 2013-07-16 9:05 UTC (permalink / raw) To: linus.walleij; +Cc: linux-omap, linux-kernel, linux-arm-kernel Hi all, As discussed earlier, the pinctrl support for changing some of the consumer device pins during runtime needs some improvment. Here are the patches to do that, I'll also post a minimal sample patch as a reply to this thread on how to do the muxing for runtime PM. Regards, Tony --- Tony Lindgren (4): pinctrl: Remove duplicate code in pinctrl_pm_select_state functions pinctrl: Allow pinctrl to have multiple active states pinctrl: Add support for additional dynamic states drivers: Add pinctrl handling for dynamic pin states drivers/base/pinctrl.c | 39 +++++ drivers/pinctrl/core.c | 250 ++++++++++++++++++++++++++++----- drivers/pinctrl/core.h | 10 + include/linux/pinctrl/consumer.h | 46 ++++++ include/linux/pinctrl/devinfo.h | 4 + include/linux/pinctrl/pinctrl-state.h | 15 ++ 6 files changed, 321 insertions(+), 43 deletions(-) -- Signature ^ permalink raw reply [flat|nested] 40+ messages in thread
* [PATCH 1/4] pinctrl: Remove duplicate code in pinctrl_pm_select_state functions 2013-07-16 9:05 [PATCH 0/4] improved support for runtime muxing for pinctrl Tony Lindgren @ 2013-07-16 9:05 ` Tony Lindgren 2013-07-16 13:15 ` Grygorii Strashko 2013-07-16 9:05 ` [PATCH 2/4] pinctrl: Allow pinctrl to have multiple active states Tony Lindgren ` (4 subsequent siblings) 5 siblings, 1 reply; 40+ messages in thread From: Tony Lindgren @ 2013-07-16 9:05 UTC (permalink / raw) To: linus.walleij; +Cc: linux-omap, linux-kernel, linux-arm-kernel, Stephen Warren There's no need to duplicate essentially the same functions. Let's introduce static int pinctrl_pm_select_state() and make the other related functions call that. This allows us to add support later on for multiple active states, and more optimized dynamic remuxing. Note that we still need to export the various pinctrl_pm_select functions as we want to keep struct pinctrl_state private to the pinctrl code, and cannot replace those with inline functions. Cc: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Tony Lindgren <tony@atomide.com> --- drivers/pinctrl/core.c | 47 +++++++++++++++++++---------------------------- 1 file changed, 19 insertions(+), 28 deletions(-) diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index 5b272bf..bda2c61 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -1227,23 +1227,34 @@ EXPORT_SYMBOL_GPL(pinctrl_force_default); #ifdef CONFIG_PM /** - * pinctrl_pm_select_default_state() - select default pinctrl state for PM + * pinctrl_pm_select_state() - select pinctrl state for PM * @dev: device to select default state for + * @state: state to set */ -int pinctrl_pm_select_default_state(struct device *dev) +static int pinctrl_pm_select_state(struct device *dev, struct pinctrl_state *state) { struct dev_pin_info *pins = dev->pins; int ret; if (!pins) return 0; - if (IS_ERR(pins->default_state)) - return 0; /* No default state */ - ret = pinctrl_select_state(pins->p, pins->default_state); + if (IS_ERR(state)) + return 0; /* No such state */ + ret = pinctrl_select_state(pins->p, state); if (ret) - dev_err(dev, "failed to activate default pinctrl state\n"); + dev_err(dev, "failed to activate pinctrl state %s\n", + state->name); return ret; } + +/** + * pinctrl_pm_select_default_state() - select default pinctrl state for PM + * @dev: device to select default state for + */ +int pinctrl_pm_select_default_state(struct device *dev) +{ + return pinctrl_pm_select_state(dev, dev->pins->default_state); +} EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state); /** @@ -1252,17 +1263,7 @@ EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state); */ int pinctrl_pm_select_sleep_state(struct device *dev) { - struct dev_pin_info *pins = dev->pins; - int ret; - - if (!pins) - return 0; - if (IS_ERR(pins->sleep_state)) - return 0; /* No sleep state */ - ret = pinctrl_select_state(pins->p, pins->sleep_state); - if (ret) - dev_err(dev, "failed to activate pinctrl sleep state\n"); - return ret; + return pinctrl_pm_select_state(dev, dev->pins->sleep_state); } EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state); @@ -1272,17 +1273,7 @@ EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state); */ int pinctrl_pm_select_idle_state(struct device *dev) { - struct dev_pin_info *pins = dev->pins; - int ret; - - if (!pins) - return 0; - if (IS_ERR(pins->idle_state)) - return 0; /* No idle state */ - ret = pinctrl_select_state(pins->p, pins->idle_state); - if (ret) - dev_err(dev, "failed to activate pinctrl idle state\n"); - return ret; + return pinctrl_pm_select_state(dev, dev->pins->idle_state); } EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state); #endif ^ permalink raw reply related [flat|nested] 40+ messages in thread
* Re: [PATCH 1/4] pinctrl: Remove duplicate code in pinctrl_pm_select_state functions 2013-07-16 9:05 ` [PATCH 1/4] pinctrl: Remove duplicate code in pinctrl_pm_select_state functions Tony Lindgren @ 2013-07-16 13:15 ` Grygorii Strashko 2013-07-16 13:41 ` Tony Lindgren 0 siblings, 1 reply; 40+ messages in thread From: Grygorii Strashko @ 2013-07-16 13:15 UTC (permalink / raw) To: Tony Lindgren Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel, Stephen Warren Hi Tony, This patch causes boot failure when I've applied my patch "[RFC] ARM: OMAP2+: omap_device: add pinctrl handling" https://lkml.org/lkml/2013/6/21/309 on top of it: [ 0.264007] L310 cache controller enabled [ 0.268310] l2x0: 16 ways, CACHE_ID 0x410000c4, AUX_CTRL 0x7e470000, Cache size: 1048576 B [ 0.282440] CPU1: Booted secondary processor [ 0.366760] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001 [ 0.367401] Brought up 2 CPUs [ 0.380920] SMP: Total of 2 processors activated (2387.96 BogoMIPS). [ 0.387573] CPU: All CPU(s) started in SVC mode. [ 0.395324] devtmpfs: initialized [ 0.468658] pinctrl core: initialized pinctrl subsystem [ 0.477996] regulator-dummy: no parameters [ 0.485412] NET: Registered protocol family 16 [ 0.499145] DMA: preallocated 256 KiB pool for atomic coherent allocations [ 0.573181] Unable to handle kernel NULL pointer dereference at virtual address 00000008 [ 0.581573] pgd = c0004000 [ 0.584472] [00000008] *pgd=00000000 [ 0.588226] Internal error: Oops: 5 [#1] SMP ARM [ 0.593078] Modules linked in: [ 0.596313] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.11.0-rc1-00005-g37e15e6-dirty #100 [ 0.604888] task: de07f3c0 ti: de080000 task.ti: de080000 [ 0.610565] PC is at pinctrl_pm_select_active_state+0x4/0xc [ 0.616394] LR is at _od_runtime_resume+0xc/0x20 [ 0.621215] pc : [<c02d4e2c>] lr : [<c002e930>] psr: 60000193 [ 0.621215] sp : de081cc0 ip : 60000193 fp : 00000000 [ 0.633209] r10: de080000 r9 : c0067e90 r8 : 00000004 [ 0.638671] r7 : c07800c0 r6 : c002e924 r5 : de0cf4a0 r4 : de0cf410 [ 0.645477] r3 : 00000000 r2 : 00000004 r1 : 00000470 r0 : de0cf410 [ 0.652282] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel [ 0.660003] Control: 10c53c7d Table: 8000404a DAC: 00000017 [ 0.665985] Process swapper/0 (pid: 1, stack limit = 0xde080240) [ 0.672241] Stack: (0xde081cc0 to 0xde082000) [ 0.676818] 1cc0: de0cf410 c0335310 de0cf410 de0cb410 00000001 c0335374 de0cf410 de0cb410 [ 0.685333] 1ce0: 00000001 c033664c c0336b14 00000004 c1bbdedc 00000000 00000000 c0507c5c [ 0.693847] 1d00: de0cf4a0 de0cf410 60000113 00000004 c1bbdedc 00000000 00000000 c0336b24 [ 0.702362] 1d20: de07f3c0 de11ea10 de0cf410 de0cf400 de0cd780 c02df144 de0cd740 00000000 [ 0.710845] 1d40: de0cf410 c0d6a634 de0cf410 00000000 00000000 c07efe7c 00000000 00000000 [ 0.719360] 1d60: 00000000 c032d794 c032d77c c032c554 de0cf410 c032c784 00000000 00000000 [ 0.727874] 1d80: c0d6a5f0 c032ac98 de07bed8 de0fd714 de0cf410 de0cf444 c07f65e8 c032c48c [ 0.736389] 1da0: de0cf410 de0cf410 c07f65e8 c032b[RFC] ARM: OMAP2+: omap_device: add pinctrl handlinga94 de0cf410 de0cf418 de0cb410 c0329ef8 [ 0.744873] 1dc0: 4a3101ff 00000000 00000200 00000000 00000000 00000000 c076f630 00000000 [ 0.753387] 1de0: de0cf400 00000000 de0cb410 c076f630 de0cb410 00000000 00000000 c042c2dc [ 0.761901] 1e00: de0cb410 c1bbdedc 00000000 00000000 00000001 c042c3dc 00000001 c076f630 [ 0.770385] 1e20: 00000000 de0cb410 00000000 c0099068 60000113 c080b22c c1bbdd98 00000001 [ 0.778900] 1e40: c076f630 c1bbcaec 00000000 c1bbdedc 00000001 c076f630 00000000 de0cb410 [ 0.787414] 1e60: 00000000 c042c440 00000001 c076f630 00000000 00000001 00000000 c0099068 [ 0.795928] 1e80: 60000113 c080b22c 00000000 00000000 c076f630 c1bbcaec c1bbc09c 00000000 [ 0.804412] 1ea0: 00000000 c076f630 00000000 00000001 00000000 c042c4e4 00000001 c072c37c [ 0.812927] 1ec0: c07221e0 de080000 c0762648 00000000 000000a4 c077979c c071f1c8 c0730a6c [ 0.821441] 1ee0: c0760aec c07221fc 00000000 c0008978 00000083 de07f3c0 60000193 00000000 [ 0.829925] 1f00: 00000006 c07dbcd4 c07dbcd4 60000113 c02bf100 00000000 c07dbcd0 c07dbcd0 [ 0.838439] 1f20: 00000000 c0507c5c 00000002 de080000 c06f1920 c1bc531d 000000a4 c00655ec [ 0.846954] 1f40: c06b2bd8 c06f0ee0 00000003 00000003 60000113 c0762668 00000003 c0762648 [ 0.855468] 1f60: c0817500 000000a4 c077979c c071f1c8 00000000 c071f91c 00000003 00000003 [ 0.863952] 1f80: c071f1c8 00000000 00000000 c04fd9ac 00000000 00000000 00000000 00000000 [ 0.872467] 1fa0: 00000000 c04fd9b4 00000000 c0013ac8 00000000 00000000 00000000 00000000 [ 0.880981] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 0.889465] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 ce5331ac 3153ceac [ 0.898010] [<c02d4e2c>] (pinctrl_pm_select_active_state+0x4/0xc) from [<c002e930>] (_od_runtime_resume+0xc/0x20) [ 0.908660] [<c002e930>] (_od_runtime_resume+0xc/0x20) from [<c0335310>] (__rpm_callback+0x34/0x70) [ 0.918060] [<c0335310>] (__rpm_callback+0x34/0x70) from [<c0335374>] (rpm_callback+0x28/0x88) [ 0.927032] [<c0335374>] (rpm_callback+0x28/0x88) from [<c033664c>] (rpm_resume+0x3c8/0x624) [ 0.935821] [<c033664c>] (rpm_resume+0x3c8/0x624) from [<c0336b24>] (__pm_runtime_resume+0x48/0x60) [ 0.945220] [<c0336b24>] (__pm_runtime_resume+0x48/0x60) from [<c02df144>] (omap_gpio_probe+0x254/0x6c0) [ 0.955078] [<c02df144>] (omap_gpio_probe+0x254/0x6c0) from [<c032d794>] (platform_drv_probe+0x18/0x1c) [ 0.964843] [<c032d794>] (platform_drv_probe+0x18/0x1c) from [<c032c554>] (driver_probe_device+0x88/0x220) [ 0.974884] [<c032c554>] (driver_probe_device+0x88/0x220) from [<c032ac98>] (bus_for_each_drv+0x5c/0x88) [ 0.984710] [<c032ac98>] (bus_for_each_drv+0x5c/0x88) from [<c032c48c>] (device_attach+0x80/0xa4) [ 0.993957] [<c032c48c>] (device_attach+0x80/0xa4) from [<c032ba94>] (bus_probe_device+0x88/0xac) [ 1.003173] [<c032ba94>] (bus_probe_device+0x88/0xac) from [<c0329ef8>] (device_add+0x418/0x61c) [ 1.012329] [<c0329ef8>] (device_add+0x418/0x61c) from [<c042c2dc>] (of_platform_device_create_pdata+0x5c/0x80) [ 1.022796] [<c042c2dc>] (of_platform_device_create_pdata+0x5c/0x80) from [<c042c3dc>] (of_platform_bus_create+0xdc/0x184) [ 1.034271] [<c042c3dc>] (of_platform_bus_create+0xdc/0x184) from [<c042c440>] (of_platform_bus_create+0x140/0x184) [ 1.045104] [<c042c440>] (of_platform_bus_create+0x140/0x184) from [<c042c4e4>] (of_platform_populate+0x60/0x98) [ 1.055664] [<c042c4e4>] (of_platform_populate+0x60/0x98) from [<c0730a6c>] (omap_generic_init+0x24/0x60) [ 1.065612] [<c0730a6c>] (omap_generic_init+0x24/0x60) from [<c07221fc>] (customize_machine+0x1c/0x40) [ 1.075286] [<c07221fc>] (customize_machine+0x1c/0x40) from [<c0008978>] (do_one_initcall+0xe4/0x148) [ 1.084869] [<c0008978>] (do_one_initcall+0xe4/0x148) from [<c071f91c>] (kernel_init_freeable+0xfc/0x1c8) [ 1.094818] [<c071f91c>] (kernel_init_freeable+0xfc/0x1c8) from [<c04fd9b4>] (kernel_init+0x8/0xe4) [ 1.104248] [<c04fd9b4>] (kernel_init+0x8/0xe4) from [<c0013ac8>] (ret_from_fork+0x14/0x2c) [ 1.112915] Code: e59031b4 e593100c eaffffde e59031b4 (e5931008) [ 1.119323] ---[ end trace fd7907bbe82cc699 ]--- [ 1.124206] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b [ 1.124206] [ 1.133789] CPU1: stopping [ 1.136657] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G D 3.11.0-rc1-00005-g37e15e6-dirty #100 [ 1.146270] [<c001b62c>] (unwind_backtrace+0x0/0xf0) from [<c00177fc>] (show_stack+0x10/0x14) [ 1.155151] [<c00177fc>] (show_stack+0x10/0x14) from [<c05027cc>] (dump_stack+0x70/0x8c) [ 1.163574] [<c05027cc>] (dump_stack+0x70/0x8c) from [<c0019384>] (handle_IPI+0x130/0x158) [ 1.172180] [<c0019384>] (handle_IPI+0x130/0x158) from [<c0008760>] (gic_handle_irq+0x54/0x5c) [ 1.181121] [<c0008760>] (gic_handle_irq+0x54/0x5c) from [<c0508624>] (__irq_svc+0x44/0x5c) [ 1.189819] Exception stack(0xde0a7f90 to 0xde0a7fd8) [ 1.195098] 7f80: c0014ca8 000002da 00000000 00000000 [ 1.203613] 7fa0: de0a6000 00000000 10c03c7d c0817774 c0514820 c0815e40 c07869a8 00000000 [ 1.212097] 7fc0: 01000000 de0a7fd8 c0014ca8 c0014cac 60000113 ffffffff [ 1.219024] [<c0508624>] (__irq_svc+0x44/0x5c) from [<c0014cac>] (arch_cpu_idle+0x38/0x44) [ 1.227630] [<c0014cac>] (arch_cpu_idle+0x38/0x44) from [<c00875d4>] (cpu_startup_entry+0xa8/0x228) [ 1.237030] [<c00875d4>] (cpu_startup_entry+0xa8/0x228) from [<80008264>] (0x80008264) On 07/16/2013 12:05 PM, Tony Lindgren wrote: > There's no need to duplicate essentially the same functions. Let's > introduce static int pinctrl_pm_select_state() and make the other > related functions call that. > > This allows us to add support later on for multiple active states, > and more optimized dynamic remuxing. > > Note that we still need to export the various pinctrl_pm_select > functions as we want to keep struct pinctrl_state private to the > pinctrl code, and cannot replace those with inline functions. > > Cc: Stephen Warren <swarren@wwwdotorg.org> > Signed-off-by: Tony Lindgren <tony@atomide.com> > --- > drivers/pinctrl/core.c | 47 +++++++++++++++++++---------------------------- > 1 file changed, 19 insertions(+), 28 deletions(-) > > diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c > index 5b272bf..bda2c61 100644 > --- a/drivers/pinctrl/core.c > +++ b/drivers/pinctrl/core.c > @@ -1227,23 +1227,34 @@ EXPORT_SYMBOL_GPL(pinctrl_force_default); > #ifdef CONFIG_PM > > /** > - * pinctrl_pm_select_default_state() - select default pinctrl state for PM > + * pinctrl_pm_select_state() - select pinctrl state for PM > * @dev: device to select default state for > + * @state: state to set > */ > -int pinctrl_pm_select_default_state(struct device *dev) > +static int pinctrl_pm_select_state(struct device *dev, struct pinctrl_state *state) > { > struct dev_pin_info *pins = dev->pins; > int ret; > > if (!pins) > return 0; > - if (IS_ERR(pins->default_state)) > - return 0; /* No default state */ > - ret = pinctrl_select_state(pins->p, pins->default_state); > + if (IS_ERR(state)) > + return 0; /* No such state */ > + ret = pinctrl_select_state(pins->p, state); > if (ret) > - dev_err(dev, "failed to activate default pinctrl state\n"); > + dev_err(dev, "failed to activate pinctrl state %s\n", > + state->name); > return ret; > } > + > +/** > + * pinctrl_pm_select_default_state() - select default pinctrl state for PM > + * @dev: device to select default state for > + */ > +int pinctrl_pm_select_default_state(struct device *dev) > +{ Seems, need to keep check for !dev->pins here if (!dev->pins) return 0; > + return pinctrl_pm_select_state(dev, dev->pins->default_state); > +} > EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state); > > /** > @@ -1252,17 +1263,7 @@ EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state); > */ > int pinctrl_pm_select_sleep_state(struct device *dev) > { > - struct dev_pin_info *pins = dev->pins; > - int ret; > - > - if (!pins) > - return 0; > - if (IS_ERR(pins->sleep_state)) > - return 0; /* No sleep state */ > - ret = pinctrl_select_state(pins->p, pins->sleep_state); > - if (ret) > - dev_err(dev, "failed to activate pinctrl sleep state\n"); > - return ret; here if (!dev->pins) return 0; > + return pinctrl_pm_select_state(dev, dev->pins->sleep_state); > } > EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state); > > @@ -1272,17 +1273,7 @@ EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state); > */ > int pinctrl_pm_select_idle_state(struct device *dev) > { > - struct dev_pin_info *pins = dev->pins; > - int ret; > - > - if (!pins) > - return 0; > - if (IS_ERR(pins->idle_state)) > - return 0; /* No idle state */ > - ret = pinctrl_select_state(pins->p, pins->idle_state); > - if (ret) > - dev_err(dev, "failed to activate pinctrl idle state\n"); > - return ret; here if (!dev->pins) return 0; > + return pinctrl_pm_select_state(dev, dev->pins->idle_state); > } > EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state); > #endif > > -- > To unsubscribe from this list: send the line "unsubscribe linux-omap" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 1/4] pinctrl: Remove duplicate code in pinctrl_pm_select_state functions 2013-07-16 13:15 ` Grygorii Strashko @ 2013-07-16 13:41 ` Tony Lindgren 2013-07-16 14:25 ` Grygorii Strashko 0 siblings, 1 reply; 40+ messages in thread From: Tony Lindgren @ 2013-07-16 13:41 UTC (permalink / raw) To: Grygorii Strashko Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel, Stephen Warren * Grygorii Strashko <grygorii.strashko@ti.com> [130716 06:22]: > Hi Tony, > > This patch causes boot failure when I've applied my patch > "[RFC] ARM: OMAP2+: omap_device: add pinctrl handling" > https://lkml.org/lkml/2013/6/21/309 > > on top of it: Hmm this patch alone removes duplicate code and if it causes issues I must have made a typo somewhere. I cannot see a typo though, but in your dmesg I see something.. > [ 0.610565] PC is at pinctrl_pm_select_active_state+0x4/0xc ..looks like you have something applied for the active_state that only gets introduced later on in this series. Maybe you have the earlier version of drivers/base/pinctrl.c active_state patch that was in linux next for a while but got reverted as we noticed we had to rework some things? So maybe try with v3.11-rc1 + these four patches + your omap_device patch? Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 1/4] pinctrl: Remove duplicate code in pinctrl_pm_select_state functions 2013-07-16 13:41 ` Tony Lindgren @ 2013-07-16 14:25 ` Grygorii Strashko 2013-07-17 6:31 ` Tony Lindgren 0 siblings, 1 reply; 40+ messages in thread From: Grygorii Strashko @ 2013-07-16 14:25 UTC (permalink / raw) To: Tony Lindgren Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel, Stephen Warren Hi Tony, On 07/16/2013 04:41 PM, Tony Lindgren wrote: > * Grygorii Strashko <grygorii.strashko@ti.com> [130716 06:22]: >> Hi Tony, >> >> This patch causes boot failure when I've applied my patch >> "[RFC] ARM: OMAP2+: omap_device: add pinctrl handling" >> https://lkml.org/lkml/2013/6/21/309 >> >> on top of it: > > Hmm this patch alone removes duplicate code and if it causes > issues I must have made a typo somewhere. No typo :) You've removed the check for !dev-pins. And the failure place is: int pinctrl_pm_select_active_state(struct device *dev) { return pinctrl_pm_select_state(dev, dev->pins->active_state); ^^^^ here } If I understand everything right, the pinctrl support in Device core assumed to be optional - so, It's valid case, when there are no definition for device's pinctrl in DT at all. And in this case dev->pins == NULL and pinctrl_pm_select_*() API should return 0 always. > > I cannot see a typo though, but in your dmesg I see something.. > >> [ 0.610565] PC is at pinctrl_pm_select_active_state+0x4/0xc Yep. This will happen if there are no pinctrl states defined in DT - currently it's crashed when GPIO driver probed. > > ..looks like you have something applied for the active_state > that only gets introduced later on in this series. > > Maybe you have the earlier version of drivers/base/pinctrl.c > active_state patch that was in linux next for a while but > got reverted as we noticed we had to rework some things? > > So maybe try with v3.11-rc1 + these four patches + your > omap_device patch? I'm on v3.11-rc1 > > Regards, > > Tony > ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 1/4] pinctrl: Remove duplicate code in pinctrl_pm_select_state functions 2013-07-16 14:25 ` Grygorii Strashko @ 2013-07-17 6:31 ` Tony Lindgren 0 siblings, 0 replies; 40+ messages in thread From: Tony Lindgren @ 2013-07-17 6:31 UTC (permalink / raw) To: Grygorii Strashko Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel, Stephen Warren * Grygorii Strashko <grygorii.strashko@ti.com> [130716 07:32]: > Hi Tony, > > On 07/16/2013 04:41 PM, Tony Lindgren wrote: > >* Grygorii Strashko <grygorii.strashko@ti.com> [130716 06:22]: > >>Hi Tony, > >> > >>This patch causes boot failure when I've applied my patch > >>"[RFC] ARM: OMAP2+: omap_device: add pinctrl handling" > >>https://lkml.org/lkml/2013/6/21/309 > >> > >>on top of it: > > > >Hmm this patch alone removes duplicate code and if it causes > >issues I must have made a typo somewhere. > > No typo :) You've removed the check for !dev-pins. Oh OK, sorry that was not intentional. > And the failure place is: > int pinctrl_pm_select_active_state(struct device *dev) > { > return pinctrl_pm_select_state(dev, dev->pins->active_state); > ^^^^ here > } > > If I understand everything right, the pinctrl support in Device core > assumed to be optional - so, It's valid case, when there are no > definition for device's pinctrl in DT at all. > > And in this case dev->pins == NULL and pinctrl_pm_select_*() API > should return 0 always. Care to post your patch as it sounds like you have it fixed and tested? Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* [PATCH 2/4] pinctrl: Allow pinctrl to have multiple active states 2013-07-16 9:05 [PATCH 0/4] improved support for runtime muxing for pinctrl Tony Lindgren 2013-07-16 9:05 ` [PATCH 1/4] pinctrl: Remove duplicate code in pinctrl_pm_select_state functions Tony Lindgren @ 2013-07-16 9:05 ` Tony Lindgren 2013-07-17 20:55 ` Stephen Warren 2013-07-16 9:05 ` [PATCH 3/4] pinctrl: Add support for additional dynamic states Tony Lindgren ` (3 subsequent siblings) 5 siblings, 1 reply; 40+ messages in thread From: Tony Lindgren @ 2013-07-16 9:05 UTC (permalink / raw) To: linus.walleij; +Cc: linux-omap, linux-kernel, linux-arm-kernel, Stephen Warren It's quite common that we need to dynamically change some pins for a device for runtime PM, or toggle a pin between rx and tx. Changing all the pins for a device is not efficient way of doing it. So let's allow setting up multiple active states for pinctrl. Currently we only need PINCTRL_STATIC and PINCTRL_DYNAMIC, where PINCTRL_STATIC covers the current default pins, and PINCTRL_DYNAMIC holds the dynamic pins that need to be toggled. Cc: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Tony Lindgren <tony@atomide.com> --- drivers/pinctrl/core.c | 18 ++++++++++-------- drivers/pinctrl/core.h | 10 ++++++++-- 2 files changed, 18 insertions(+), 10 deletions(-) diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index bda2c61..8da11d5 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -885,7 +885,8 @@ static void pinctrl_free(struct pinctrl *p, bool inlist) mutex_lock(&pinctrl_list_mutex); list_for_each_entry_safe(state, n1, &p->states, node) { list_for_each_entry_safe(setting, n2, &state->settings, node) { - pinctrl_free_setting(state == p->state, setting); + pinctrl_free_setting(state == p->state[PINCTRL_STATIC], + setting); list_del(&setting->node); kfree(setting); } @@ -955,13 +956,13 @@ EXPORT_SYMBOL_GPL(pinctrl_lookup_state); int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state) { struct pinctrl_setting *setting, *setting2; - struct pinctrl_state *old_state = p->state; + struct pinctrl_state *old_state = p->state[PINCTRL_STATIC]; int ret; - if (p->state == state) + if (old_state == state) return 0; - if (p->state) { + if (old_state) { /* * The set of groups with a mux configuration in the old state * may not be identical to the set of groups with a mux setting @@ -971,7 +972,7 @@ int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state) * but not in the new state, this code puts that group into a * safe/disabled state. */ - list_for_each_entry(setting, &p->state->settings, node) { + list_for_each_entry(setting, &old_state->settings, node) { bool found = false; if (setting->type != PIN_MAP_TYPE_MUX_GROUP) continue; @@ -989,7 +990,7 @@ int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state) } } - p->state = NULL; + p->state[PINCTRL_STATIC] = NULL; /* Apply all the settings for the new state */ list_for_each_entry(setting, &state->settings, node) { @@ -1011,7 +1012,7 @@ int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state) } } - p->state = state; + p->state[PINCTRL_STATIC] = state; return 0; @@ -1484,7 +1485,8 @@ static int pinctrl_show(struct seq_file *s, void *what) list_for_each_entry(p, &pinctrl_list, node) { seq_printf(s, "device: %s current state: %s\n", dev_name(p->dev), - p->state ? p->state->name : "none"); + p->state[PINCTRL_STATIC] ? + p->state[PINCTRL_STATIC]->name : "none"); list_for_each_entry(state, &p->states, node) { seq_printf(s, " state: %s\n", state->name); diff --git a/drivers/pinctrl/core.h b/drivers/pinctrl/core.h index 75476b3..b99e4b3 100644 --- a/drivers/pinctrl/core.h +++ b/drivers/pinctrl/core.h @@ -53,12 +53,18 @@ struct pinctrl_dev { #endif }; +enum pinctr_states { + PINCTRL_STATIC, + PINCTRL_DYNAMIC, + PINCTRL_NR_STATES, +}; + /** * struct pinctrl - per-device pin control state holder * @node: global list node * @dev: the device using this pin control handle * @states: a list of states for this device - * @state: the current state + * @state: the current state(s) * @dt_maps: the mapping table chunks dynamically parsed from device tree for * this device, if any * @users: reference count @@ -67,7 +73,7 @@ struct pinctrl { struct list_head node; struct device *dev; struct list_head states; - struct pinctrl_state *state; + struct pinctrl_state *state[PINCTRL_NR_STATES]; struct list_head dt_maps; struct kref users; }; ^ permalink raw reply related [flat|nested] 40+ messages in thread
* Re: [PATCH 2/4] pinctrl: Allow pinctrl to have multiple active states 2013-07-16 9:05 ` [PATCH 2/4] pinctrl: Allow pinctrl to have multiple active states Tony Lindgren @ 2013-07-17 20:55 ` Stephen Warren 0 siblings, 0 replies; 40+ messages in thread From: Stephen Warren @ 2013-07-17 20:55 UTC (permalink / raw) To: Tony Lindgren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel On 07/16/2013 03:05 AM, Tony Lindgren wrote: > It's quite common that we need to dynamically change some pins for a > device for runtime PM, or toggle a pin between rx and tx. Changing all > the pins for a device is not efficient way of doing it. > > So let's allow setting up multiple active states for pinctrl. Currently > we only need PINCTRL_STATIC and PINCTRL_DYNAMIC, where PINCTRL_STATIC > covers the current default pins, and PINCTRL_DYNAMIC holds the dynamic > pins that need to be toggled. > diff --git a/drivers/pinctrl/core.h b/drivers/pinctrl/core.h > +enum pinctr_states { s/pinctr/pinctrl/ ^ permalink raw reply [flat|nested] 40+ messages in thread
* [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-16 9:05 [PATCH 0/4] improved support for runtime muxing for pinctrl Tony Lindgren 2013-07-16 9:05 ` [PATCH 1/4] pinctrl: Remove duplicate code in pinctrl_pm_select_state functions Tony Lindgren 2013-07-16 9:05 ` [PATCH 2/4] pinctrl: Allow pinctrl to have multiple active states Tony Lindgren @ 2013-07-16 9:05 ` Tony Lindgren 2013-07-16 9:35 ` Felipe Balbi ` (3 more replies) 2013-07-16 9:05 ` [PATCH 4/4] drivers: Add pinctrl handling for dynamic pin states Tony Lindgren ` (2 subsequent siblings) 5 siblings, 4 replies; 40+ messages in thread From: Tony Lindgren @ 2013-07-16 9:05 UTC (permalink / raw) To: linus.walleij; +Cc: linux-omap, linux-kernel, linux-arm-kernel, Stephen Warren To toggle dynamic states, let's add the optional active state in addition to the static default state. Then if the optional active state is defined, we can require that idle and sleep states cover the same pingroups as the active state. Then let's add pinctrl_check_dynamic() and pinctrl_select_dynamic() to use instead of pinctrl_select() to avoid breaking existing users. With pinctrl_check_dynamic() we can check that idle and sleep states match the active state for pingroups during init, and don't need to do it during runtime. Then with the states pre-validated, pinctrl_select_dynamic() can just toggle between the dynamic states without extra checks. Note that pinctr_select_state() still has valid use cases, such as changing states when the pins can be shared between two drivers and don't necessarily cover the same pingroups. For dynamic runtime toggling of pin states, we should eventually always use just pinctrl_select_dynamic(). Cc: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Tony Lindgren <tony@atomide.com> --- drivers/pinctrl/core.c | 189 ++++++++++++++++++++++++++++++++- include/linux/pinctrl/consumer.h | 46 ++++++++ include/linux/pinctrl/devinfo.h | 4 + include/linux/pinctrl/pinctrl-state.h | 15 ++- 4 files changed, 249 insertions(+), 5 deletions(-) diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index 8da11d5..4f58a97 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -887,6 +887,8 @@ static void pinctrl_free(struct pinctrl *p, bool inlist) list_for_each_entry_safe(setting, n2, &state->settings, node) { pinctrl_free_setting(state == p->state[PINCTRL_STATIC], setting); + pinctrl_free_setting(state == p->state[PINCTRL_DYNAMIC], + setting); list_del(&setting->node); kfree(setting); } @@ -1041,6 +1043,134 @@ unapply_new_state: } EXPORT_SYMBOL_GPL(pinctrl_select_state); +/** + * pinctrl_check_dynamic() - compare two states for the pins + * @dev: pinctrl consumer device pointer + * @st1: state handle + * @st2: state handle + * + * This function checks that the group pins match between the two + * states to avoid runtime checking. Use this to check dynamic pin + * states during init. + */ +int pinctrl_check_dynamic(struct device *dev, struct pinctrl_state *st1, + struct pinctrl_state *st2) +{ + struct pinctrl_setting *s1, *s2; + + list_for_each_entry(s1, &st1->settings, node) { + struct pinctrl_dev *pctldev1; + const struct pinctrl_ops *pctlops1; + const unsigned *pins1; + unsigned num_pins1; + int res; + + if (s1->type != PIN_MAP_TYPE_MUX_GROUP) + continue; + + pctldev1 = s1->pctldev; + pctlops1 = pctldev1->desc->pctlops; + res = pctlops1->get_group_pins(pctldev1, s1->data.mux.group, + &pins1, &num_pins1); + if (res) { + dev_dbg(dev, "could not get state1 group pins\n"); + return -EINVAL; + } + + list_for_each_entry(s2, &st2->settings, node) { + struct pinctrl_dev *pctldev2; + const struct pinctrl_ops *pctlops2; + const unsigned *pins2; + unsigned num_pins2; + int i, j, found = 0; + + if (s2->type != PIN_MAP_TYPE_MUX_GROUP) + continue; + + pctldev2 = s2->pctldev; + if (pctldev1 != pctldev2) { + dev_dbg(dev, "pctldev must be the same for states\n"); + return -EINVAL; + } + pctlops2 = pctldev2->desc->pctlops; + res = pctlops2->get_group_pins(pctldev2, + s2->data.mux.group, + &pins2, &num_pins2); + if (res) { + dev_dbg(dev, "could not get state2 group pins\n"); + return -EINVAL; + } + + for (i = 0; i < num_pins1; i++) { + int pin1 = pins1[i]; + + for (j = 0; j < num_pins2; j++) { + int pin2 = pins2[j]; + + if (pin1 == pin2) { + found++; + break; + } + } + } + + if (found != num_pins1) { + dev_dbg(dev, "found only %i of %i pins\n", + found, num_pins1); + return -EINVAL; + } + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(pinctrl_check_dynamic); + +/** + * pinctrl_select_dynamic() - fast path for toggling pre-validated sets of pins + * @p: the pinctrl handle for the device that requests configuration + * @state: the state handle to select/activate/program + * + * Note that as we've already checked that the PINCTRL_DYNAMIC pins always + * cover the same sets for active/idle, or rx/tx, there's no need to call + * pinux_disable_settings() on these pins. Calling it could also cause + * issues for the connected peripheral as it potentially could change the + * values of data lines for example. + */ +int pinctrl_select_dynamic(struct pinctrl *p, struct pinctrl_state *state) +{ + struct pinctrl_setting *setting; + int ret; + + if (p->state[PINCTRL_DYNAMIC] == state) + return 0; + + list_for_each_entry(setting, &state->settings, node) { + switch (setting->type) { + case PIN_MAP_TYPE_MUX_GROUP: + ret = pinmux_enable_setting(setting); + break; + case PIN_MAP_TYPE_CONFIGS_PIN: + case PIN_MAP_TYPE_CONFIGS_GROUP: + ret = pinconf_apply_setting(setting); + break; + default: + ret = -EINVAL; + break; + } + + if (ret < 0) { + dev_err(p->dev, "Error applying dynamic settings\n"); + return ret; + } + } + + p->state[PINCTRL_DYNAMIC] = state; + + return 0; +} +EXPORT_SYMBOL_GPL(pinctrl_select_dynamic); + static void devm_pinctrl_release(struct device *dev, void *res) { pinctrl_put(*(struct pinctrl **)res); @@ -1241,7 +1371,13 @@ static int pinctrl_pm_select_state(struct device *dev, struct pinctrl_state *sta return 0; if (IS_ERR(state)) return 0; /* No such state */ - ret = pinctrl_select_state(pins->p, state); + + /* Configured for proper dynamic muxing? */ + if (!IS_ERR(dev->pins->active_state)) + ret = pinctrl_select_dynamic(pins->p, state); + else + ret = pinctrl_select_state(pins->p, state); + if (ret) dev_err(dev, "failed to activate pinctrl state %s\n", state->name); @@ -1259,6 +1395,16 @@ int pinctrl_pm_select_default_state(struct device *dev) EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state); /** + * pinctrl_pm_select_active_state() - select active pinctrl state for PM + * @dev: device to select default state for + */ +int pinctrl_pm_select_active_state(struct device *dev) +{ + return pinctrl_pm_select_state(dev, dev->pins->active_state); +} +EXPORT_SYMBOL_GPL(pinctrl_pm_select_active_state); + +/** * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM * @dev: device to select sleep state for */ @@ -1277,6 +1423,41 @@ int pinctrl_pm_select_idle_state(struct device *dev) return pinctrl_pm_select_state(dev, dev->pins->idle_state); } EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state); + +static int pinctrl_pm_check_state(struct device *dev, + struct pinctrl_state *state) +{ + if (!dev) + return -EINVAL; + + return IS_ERR(state); +} + +/** + * pinctrl_pm_check_sleep_state() - check if sleep state is configured + * @dev: consumer device + * + * Call this from consumer driver to check if the sleep state + * has been properly configured on the device. + */ +int pinctrl_pm_check_sleep_state(struct device *dev) +{ + return pinctrl_pm_check_state(dev, dev->pins->sleep_state); +} +EXPORT_SYMBOL_GPL(pinctrl_pm_check_sleep_state); + +/** + * pinctrl_pm_check_idle_state() - check if idle state is configured + * @dev: consumer device + * + * Call this from consumer driver to check if the idle state + * has been properly configured on the device. + */ +int pinctrl_pm_check_idle_state(struct device *dev) +{ + return pinctrl_pm_check_state(dev, dev->pins->idle_state); +} +EXPORT_SYMBOL_GPL(pinctrl_pm_check_idle_state); #endif #ifdef CONFIG_DEBUG_FS @@ -1483,10 +1664,12 @@ static int pinctrl_show(struct seq_file *s, void *what) mutex_lock(&pinctrl_list_mutex); list_for_each_entry(p, &pinctrl_list, node) { - seq_printf(s, "device: %s current state: %s\n", + seq_printf(s, "device: %s current states: %s %s\n", dev_name(p->dev), p->state[PINCTRL_STATIC] ? - p->state[PINCTRL_STATIC]->name : "none"); + p->state[PINCTRL_STATIC]->name : "none", + p->state[PINCTRL_DYNAMIC] ? + p->state[PINCTRL_DYNAMIC]->name : "none"); list_for_each_entry(state, &p->states, node) { seq_printf(s, " state: %s\n", state->name); diff --git a/include/linux/pinctrl/consumer.h b/include/linux/pinctrl/consumer.h index 18eccef..73a82f1 100644 --- a/include/linux/pinctrl/consumer.h +++ b/include/linux/pinctrl/consumer.h @@ -36,19 +36,29 @@ extern struct pinctrl_state * __must_check pinctrl_lookup_state( struct pinctrl *p, const char *name); extern int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *s); +extern int pinctrl_check_dynamic(struct device *dev, struct pinctrl_state *s1, + struct pinctrl_state *s2); +extern int pinctrl_select_dynamic(struct pinctrl *p, struct pinctrl_state *s); extern struct pinctrl * __must_check devm_pinctrl_get(struct device *dev); extern void devm_pinctrl_put(struct pinctrl *p); #ifdef CONFIG_PM extern int pinctrl_pm_select_default_state(struct device *dev); +extern int pinctrl_pm_select_active_state(struct device *dev); extern int pinctrl_pm_select_sleep_state(struct device *dev); extern int pinctrl_pm_select_idle_state(struct device *dev); +extern int pinctrl_pm_check_sleep_state(struct device *dev); +extern int pinctrl_pm_check_idle_state(struct device *dev); #else static inline int pinctrl_pm_select_default_state(struct device *dev) { return 0; } +static inline int pinctrl_pm_select_active_state(struct device *dev) +{ + return 0; +} static inline int pinctrl_pm_select_sleep_state(struct device *dev) { return 0; @@ -57,6 +67,14 @@ static inline int pinctrl_pm_select_idle_state(struct device *dev) { return 0; } +static inline int pinctrl_pm_check_sleep_state(struct device *dev) +{ + return -ENODEV; +} +static inline int pinctrl_pm_check_idle_state(struct device *dev) +{ + return -ENODEV; +} #endif #else /* !CONFIG_PINCTRL */ @@ -102,6 +120,19 @@ static inline int pinctrl_select_state(struct pinctrl *p, return 0; } +static inline int pinctrl_check_dynamic(struct device *dev, + struct pinctrl_state *s1, + struct pinctrl_state *s2) +{ + return 0; +} + +static inline int pinctrl_select_dynamic(struct pinctrl *p, + struct pinctrl_state *s) +{ + return 0; +} + static inline struct pinctrl * __must_check devm_pinctrl_get(struct device *dev) { return NULL; @@ -116,6 +147,11 @@ static inline int pinctrl_pm_select_default_state(struct device *dev) return 0; } +static inline int pinctrl_pm_select_active_state(struct device *dev) +{ + return 0; +} + static inline int pinctrl_pm_select_sleep_state(struct device *dev) { return 0; @@ -126,6 +162,16 @@ static inline int pinctrl_pm_select_idle_state(struct device *dev) return 0; } +static inline int pinctrl_pm_check_sleep_state(struct device *dev) +{ + return -ENODEV; +} + +static inline int pinctrl_pm_check_idle_state(struct device *dev) +{ + return -ENODEV; +} + #endif /* CONFIG_PINCTRL */ static inline struct pinctrl * __must_check pinctrl_get_select( diff --git a/include/linux/pinctrl/devinfo.h b/include/linux/pinctrl/devinfo.h index 281cb91..2857a7b 100644 --- a/include/linux/pinctrl/devinfo.h +++ b/include/linux/pinctrl/devinfo.h @@ -24,10 +24,14 @@ * struct dev_pin_info - pin state container for devices * @p: pinctrl handle for the containing device * @default_state: the default state for the handle, if found + * @active_state: the default state for the handle, if found + * @sleep_state: the default state for the handle, if found + * @idle_state: the default state for the handle, if found */ struct dev_pin_info { struct pinctrl *p; struct pinctrl_state *default_state; + struct pinctrl_state *active_state; #ifdef CONFIG_PM struct pinctrl_state *sleep_state; struct pinctrl_state *idle_state; diff --git a/include/linux/pinctrl/pinctrl-state.h b/include/linux/pinctrl/pinctrl-state.h index b5919f8..c136e82 100644 --- a/include/linux/pinctrl/pinctrl-state.h +++ b/include/linux/pinctrl/pinctrl-state.h @@ -9,16 +9,27 @@ * hogs to configure muxing and pins at boot, and also as a state * to go into when returning from sleep and idle in * .pm_runtime_resume() or ordinary .resume() for example. + * @PINCTRL_STATE_ACTIVE: optional state of dynamic pins in addition to + * PINCTRL_STATE_DEFAULT that are needed during runtime. * @PINCTRL_STATE_IDLE: the state the pinctrl handle shall be put into * when the pins are idle. This is a state where the system is relaxed * but not fully sleeping - some power may be on but clocks gated for * example. Could typically be set from a pm_runtime_suspend() or - * pm_runtime_idle() operation. + * pm_runtime_idle() operation. If PINCTRL_STATE_ACTIVE pins are + * defined, PINCTRL_STATE_IDLE pin groups must cover the same pin + * groups as PINCTRL_STATE_ACTIVE and selecting PINCTRL_STATE_IDLE + * must be done using pinctrl_select_state_dynamic() instead of + * pinctrl_select_state(). * @PINCTRL_STATE_SLEEP: the state the pinctrl handle shall be put into * when the pins are sleeping. This is a state where the system is in * its lowest sleep state. Could typically be set from an - * ordinary .suspend() function. + * ordinary .suspend() function. If PINCTRL_STATE_ACTIVE pins are + * defined, PINCTRL_STATE_SLEEP pin groups must cover the same pin + * groups as PINCTRL_STATE_ACTIVE and selecting PINCTRL_STATE_SLEEP + * must be done using pinctrl_select_state_dynamic() instead of + * pinctrl_select_state(). */ #define PINCTRL_STATE_DEFAULT "default" +#define PINCTRL_STATE_ACTIVE "active" #define PINCTRL_STATE_IDLE "idle" #define PINCTRL_STATE_SLEEP "sleep" ^ permalink raw reply related [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-16 9:05 ` [PATCH 3/4] pinctrl: Add support for additional dynamic states Tony Lindgren @ 2013-07-16 9:35 ` Felipe Balbi 2013-07-16 12:06 ` Tony Lindgren 2013-07-17 21:14 ` Stephen Warren ` (2 subsequent siblings) 3 siblings, 1 reply; 40+ messages in thread From: Felipe Balbi @ 2013-07-16 9:35 UTC (permalink / raw) To: Tony Lindgren Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel, Stephen Warren [-- Attachment #1: Type: text/plain, Size: 2082 bytes --] Hi, On Tue, Jul 16, 2013 at 02:05:36AM -0700, Tony Lindgren wrote: > +int pinctrl_check_dynamic(struct device *dev, struct pinctrl_state *st1, > + struct pinctrl_state *st2) > +{ > + struct pinctrl_setting *s1, *s2; > + > + list_for_each_entry(s1, &st1->settings, node) { > + struct pinctrl_dev *pctldev1; > + const struct pinctrl_ops *pctlops1; > + const unsigned *pins1; > + unsigned num_pins1; > + int res; > + > + if (s1->type != PIN_MAP_TYPE_MUX_GROUP) > + continue; > + > + pctldev1 = s1->pctldev; > + pctlops1 = pctldev1->desc->pctlops; > + res = pctlops1->get_group_pins(pctldev1, s1->data.mux.group, > + &pins1, &num_pins1); > + if (res) { > + dev_dbg(dev, "could not get state1 group pins\n"); > + return -EINVAL; > + } > + > + list_for_each_entry(s2, &st2->settings, node) { > + struct pinctrl_dev *pctldev2; > + const struct pinctrl_ops *pctlops2; > + const unsigned *pins2; > + unsigned num_pins2; > + int i, j, found = 0; > + > + if (s2->type != PIN_MAP_TYPE_MUX_GROUP) > + continue; > + > + pctldev2 = s2->pctldev; > + if (pctldev1 != pctldev2) { > + dev_dbg(dev, "pctldev must be the same for states\n"); > + return -EINVAL; > + } > + pctlops2 = pctldev2->desc->pctlops; > + res = pctlops2->get_group_pins(pctldev2, > + s2->data.mux.group, > + &pins2, &num_pins2); > + if (res) { > + dev_dbg(dev, "could not get state2 group pins\n"); > + return -EINVAL; > + } > + > + for (i = 0; i < num_pins1; i++) { > + int pin1 = pins1[i]; > + > + for (j = 0; j < num_pins2; j++) { > + int pin2 = pins2[j]; > + > + if (pin1 == pin2) { > + found++; > + break; > + } > + } > + } 4 levels of nested loops ? Isn't this way too much ? OTOH, it points to the fact that, perhaps, a list isn't the best data structure for pinctrl ?? Or perhaps you could just assume that if num_pins1 == num_pins2 it's enough ? But that will, likely, leave some uncovered corners... -- balbi [-- Attachment #2: Digital signature --] [-- Type: application/pgp-signature, Size: 836 bytes --] ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-16 9:35 ` Felipe Balbi @ 2013-07-16 12:06 ` Tony Lindgren 0 siblings, 0 replies; 40+ messages in thread From: Tony Lindgren @ 2013-07-16 12:06 UTC (permalink / raw) To: Felipe Balbi Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel, Stephen Warren * Felipe Balbi <balbi@ti.com> [130716 02:42]: > Hi, > > On Tue, Jul 16, 2013 at 02:05:36AM -0700, Tony Lindgren wrote: > > +int pinctrl_check_dynamic(struct device *dev, struct pinctrl_state *st1, > > + struct pinctrl_state *st2) > > +{ > > + struct pinctrl_setting *s1, *s2; > > + > > + list_for_each_entry(s1, &st1->settings, node) { > > + struct pinctrl_dev *pctldev1; > > + const struct pinctrl_ops *pctlops1; > > + const unsigned *pins1; > > + unsigned num_pins1; > > + int res; > > + > > + if (s1->type != PIN_MAP_TYPE_MUX_GROUP) > > + continue; > > + > > + pctldev1 = s1->pctldev; > > + pctlops1 = pctldev1->desc->pctlops; > > + res = pctlops1->get_group_pins(pctldev1, s1->data.mux.group, > > + &pins1, &num_pins1); > > + if (res) { > > + dev_dbg(dev, "could not get state1 group pins\n"); > > + return -EINVAL; > > + } > > + > > + list_for_each_entry(s2, &st2->settings, node) { > > + struct pinctrl_dev *pctldev2; > > + const struct pinctrl_ops *pctlops2; > > + const unsigned *pins2; > > + unsigned num_pins2; > > + int i, j, found = 0; > > + > > + if (s2->type != PIN_MAP_TYPE_MUX_GROUP) > > + continue; > > + > > + pctldev2 = s2->pctldev; > > + if (pctldev1 != pctldev2) { > > + dev_dbg(dev, "pctldev must be the same for states\n"); > > + return -EINVAL; > > + } > > + pctlops2 = pctldev2->desc->pctlops; > > + res = pctlops2->get_group_pins(pctldev2, > > + s2->data.mux.group, > > + &pins2, &num_pins2); > > + if (res) { > > + dev_dbg(dev, "could not get state2 group pins\n"); > > + return -EINVAL; > > + } > > + > > + for (i = 0; i < num_pins1; i++) { > > + int pin1 = pins1[i]; > > + > > + for (j = 0; j < num_pins2; j++) { > > + int pin2 = pins2[j]; > > + > > + if (pin1 == pin2) { > > + found++; > > + break; > > + } > > + } > > + } > > 4 levels of nested loops ? Isn't this way too much ? OTOH, it points to > the fact that, perhaps, a list isn't the best data structure for > pinctrl ?? This check is only done during init to avoid constantly diffing the pins during runtime like we currently do. And it's only done for the pins that need to change during runtime for wake-up events etc. So that's typically few to ten pins per device that need to be checked. I agree there are things to improve for the data structures, but that's a different patch set. > Or perhaps you could just assume that if num_pins1 == num_pins2 it's > enough ? But that will, likely, leave some uncovered corners... Yes I considered that, but checking for the number of pins is not enough. It's best to check them properly during init. Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-16 9:05 ` [PATCH 3/4] pinctrl: Add support for additional dynamic states Tony Lindgren 2013-07-16 9:35 ` Felipe Balbi @ 2013-07-17 21:14 ` Stephen Warren 2013-07-18 7:25 ` Tony Lindgren 2013-07-17 21:23 ` Stephen Warren 2013-07-22 23:07 ` Linus Walleij 3 siblings, 1 reply; 40+ messages in thread From: Stephen Warren @ 2013-07-17 21:14 UTC (permalink / raw) To: Tony Lindgren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel On 07/16/2013 03:05 AM, Tony Lindgren wrote: > To toggle dynamic states, let's add the optional active state in > addition to the static default state. Then if the optional active > state is defined, we can require that idle and sleep states cover > the same pingroups as the active state. > > Then let's add pinctrl_check_dynamic() and pinctrl_select_dynamic() > to use instead of pinctrl_select() to avoid breaking existing users. > > With pinctrl_check_dynamic() we can check that idle and sleep states > match the active state for pingroups during init, and don't need to > do it during runtime. > > Then with the states pre-validated, pinctrl_select_dynamic() can > just toggle between the dynamic states without extra checks. > > Note that pinctr_select_state() still has valid use cases, such as > changing states when the pins can be shared between two drivers > and don't necessarily cover the same pingroups. For dynamic runtime > toggling of pin states, we should eventually always use just > pinctrl_select_dynamic(). > diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c > @@ -887,6 +887,8 @@ static void pinctrl_free(struct pinctrl *p, bool inlist) > list_for_each_entry_safe(setting, n2, &state->settings, node) { > pinctrl_free_setting(state == p->state[PINCTRL_STATIC], > setting); > + pinctrl_free_setting(state == p->state[PINCTRL_DYNAMIC], > + setting); This will cause pinmux_free_setting() or pinconf_free_setting() to be called twice on the setting object. Right now they don't do anything, but if they start to kfree() some dynamically-allocated data that's stored within the setting, that'll cause problems. I would suggest a loop body something more like: bool disable_setting = state == XXX || state == YYY; pinctrl_free_setting(disable_setting, setting); > +int pinctrl_check_dynamic(struct device *dev, struct pinctrl_state *st1, > + struct pinctrl_state *st2) > +{ > + struct pinctrl_setting *s1, *s2; > + > + list_for_each_entry(s1, &st1->settings, node) { ... > + list_for_each_entry(s2, &st2->settings, node) { ... > + if (pctldev1 != pctldev2) { > + dev_dbg(dev, "pctldev must be the same for states\n"); > + return -EINVAL; > + } I don't think we should require that; it's perfectly legal at the moment for some device's pinctrl configuration to include settings from multiple different pin controllers. > + for (i = 0; i < num_pins1; i++) { > + int pin1 = pins1[i]; > + > + for (j = 0; j < num_pins2; j++) { > + int pin2 = pins2[j]; > + > + if (pin1 == pin2) { > + found++; > + break; > + } > + } > + } > + > + if (found != num_pins1) { I guess this make sure that every entry in the dynamic state is in the state state, but not vice-versa; the static state can affect more stuff than the dynamic state? If so, shouldn't that check be if (found != num_pins2)? > +int pinctrl_select_dynamic(struct pinctrl *p, struct pinctrl_state *state) The body of this function is rather duplicated with pinctrl_select(). > @@ -1241,7 +1371,13 @@ static int pinctrl_pm_select_state(struct device *dev, struct pinctrl_state *sta > return 0; > if (IS_ERR(state)) > return 0; /* No such state */ > - ret = pinctrl_select_state(pins->p, state); > + > + /* Configured for proper dynamic muxing? */ I don't think "proper" is correct here; it's just fine not to have any dynamic configuration. > + if (!IS_ERR(dev->pins->active_state)) > + ret = pinctrl_select_dynamic(pins->p, state); > + else > + ret = pinctrl_select_state(pins->p, state); Hmmm. I'm not quite sure this is right... Surely this function should just do nothing if the dynamic states aren't defined? The system should just, and only, be in the "default" state and never do anything else. Looking back at patch 1, I see the are pinctrl_pm_select_{default,sleep,idle}_state(). Shouldn't that list be active/sleep/idle, since I assume default is that "static" state, and the other three are the "dynamic" states? > +static int pinctrl_pm_check_state(struct device *dev, > + struct pinctrl_state *state) Naming this pinctrl_pm_is_state_error() or pinctrl_pm_is_state_ok() might give more clue what its return value is expected to be. ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-17 21:14 ` Stephen Warren @ 2013-07-18 7:25 ` Tony Lindgren 2013-07-18 10:53 ` Tony Lindgren 2013-07-18 19:21 ` Stephen Warren 0 siblings, 2 replies; 40+ messages in thread From: Tony Lindgren @ 2013-07-18 7:25 UTC (permalink / raw) To: Stephen Warren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel * Stephen Warren <swarren@wwwdotorg.org> [130717 14:21]: > On 07/16/2013 03:05 AM, Tony Lindgren wrote: > > To toggle dynamic states, let's add the optional active state in > > addition to the static default state. Then if the optional active > > state is defined, we can require that idle and sleep states cover > > the same pingroups as the active state. > > > > Then let's add pinctrl_check_dynamic() and pinctrl_select_dynamic() > > to use instead of pinctrl_select() to avoid breaking existing users. > > > > With pinctrl_check_dynamic() we can check that idle and sleep states > > match the active state for pingroups during init, and don't need to > > do it during runtime. > > > > Then with the states pre-validated, pinctrl_select_dynamic() can > > just toggle between the dynamic states without extra checks. > > > > Note that pinctr_select_state() still has valid use cases, such as > > changing states when the pins can be shared between two drivers > > and don't necessarily cover the same pingroups. For dynamic runtime > > toggling of pin states, we should eventually always use just > > pinctrl_select_dynamic(). > > > diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c > > > @@ -887,6 +887,8 @@ static void pinctrl_free(struct pinctrl *p, bool inlist) > > list_for_each_entry_safe(setting, n2, &state->settings, node) { > > pinctrl_free_setting(state == p->state[PINCTRL_STATIC], > > setting); > > + pinctrl_free_setting(state == p->state[PINCTRL_DYNAMIC], > > + setting); > > This will cause pinmux_free_setting() or pinconf_free_setting() to be > called twice on the setting object. Right now they don't do anything, > but if they start to kfree() some dynamically-allocated data that's > stored within the setting, that'll cause problems. I would suggest a > loop body something more like: > > bool disable_setting = state == XXX || state == YYY; > pinctrl_free_setting(disable_setting, setting); OK good point, I'll check it. > > +int pinctrl_check_dynamic(struct device *dev, struct pinctrl_state *st1, > > + struct pinctrl_state *st2) > > +{ > > + struct pinctrl_setting *s1, *s2; > > + > > + list_for_each_entry(s1, &st1->settings, node) { > ... > > + list_for_each_entry(s2, &st2->settings, node) { > ... > > + if (pctldev1 != pctldev2) { > > + dev_dbg(dev, "pctldev must be the same for states\n"); > > + return -EINVAL; > > + } > > I don't think we should require that; it's perfectly legal at the moment > for some device's pinctrl configuration to include settings from > multiple different pin controllers. Yes that's fine for pinctrl_select(), but let's not do that for runtime muxing. Here we want to do a one-time check during init to make sure that if active_state is defined, then the idle_state and sleep_state must match active_state for pins. This way we can avoid checking things over and over again during runtime like pinctrl_select() is currently doing. > > + for (i = 0; i < num_pins1; i++) { > > + int pin1 = pins1[i]; > > + > > + for (j = 0; j < num_pins2; j++) { > > + int pin2 = pins2[j]; > > + > > + if (pin1 == pin2) { > > + found++; > > + break; > > + } > > + } > > + } > > + > > + if (found != num_pins1) { > > I guess this make sure that every entry in the dynamic state is in the > state state, but not vice-versa; the static state can affect more stuff > than the dynamic state? > > If so, shouldn't that check be if (found != num_pins2)? The check is that idle_state and sleep_state pins must match the active_state pins. This is intentionally different from the current pinctrl_select() logic. > > +int pinctrl_select_dynamic(struct pinctrl *p, struct pinctrl_state *state) > > The body of this function is rather duplicated with pinctrl_select(). Well we may be able to make pinctrl_select() use this too, I'll take a look. Initially I'd rather not start messing with pinctrl_select() to avoid breaking existing users. > > @@ -1241,7 +1371,13 @@ static int pinctrl_pm_select_state(struct device *dev, struct pinctrl_state *sta > > return 0; > > if (IS_ERR(state)) > > return 0; /* No such state */ > > - ret = pinctrl_select_state(pins->p, state); > > + > > + /* Configured for proper dynamic muxing? */ > > I don't think "proper" is correct here; it's just fine not to have any > dynamic configuration. Right, that's the most common case. I'll drop the "proper". > > + if (!IS_ERR(dev->pins->active_state)) > > + ret = pinctrl_select_dynamic(pins->p, state); > > + else > > + ret = pinctrl_select_state(pins->p, state); > > Hmmm. I'm not quite sure this is right... Surely this function should > just do nothing if the dynamic states aren't defined? The system should > just, and only, be in the "default" state and never do anything else. This keeps the existing behaviour. We should be able to drop the call to pinctrl_select_state() here after the existing use in drivers has been fixed. > Looking back at patch 1, I see the are > pinctrl_pm_select_{default,sleep,idle}_state(). Shouldn't that list be > active/sleep/idle, since I assume default is that "static" state, and > the other three are the "dynamic" states? Yes after this patch set that's the case, then we have default plus optional active. Then if active is defined, sleep and idle pins must match active. > > +static int pinctrl_pm_check_state(struct device *dev, > > + struct pinctrl_state *state) > > Naming this pinctrl_pm_is_state_error() or pinctrl_pm_is_state_ok() > might give more clue what its return value is expected to be. OK yeah I did not like that naming either, pinctrl_pm_is_state_error() sounds good to me. Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-18 7:25 ` Tony Lindgren @ 2013-07-18 10:53 ` Tony Lindgren 2013-07-18 19:21 ` Stephen Warren 1 sibling, 0 replies; 40+ messages in thread From: Tony Lindgren @ 2013-07-18 10:53 UTC (permalink / raw) To: Stephen Warren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel * Tony Lindgren <tony@atomide.com> [130718 00:31]: > * Stephen Warren <swarren@wwwdotorg.org> [130717 14:21]: > > On 07/16/2013 03:05 AM, Tony Lindgren wrote: > > > +int pinctrl_check_dynamic(struct device *dev, struct pinctrl_state *st1, > > > + struct pinctrl_state *st2) > > > +{ > > > + struct pinctrl_setting *s1, *s2; > > > + > > > + list_for_each_entry(s1, &st1->settings, node) { > > ... > > > + list_for_each_entry(s2, &st2->settings, node) { > > ... > > > + if (pctldev1 != pctldev2) { > > > + dev_dbg(dev, "pctldev must be the same for states\n"); > > > + return -EINVAL; > > > + } > > > > I don't think we should require that; it's perfectly legal at the moment > > for some device's pinctrl configuration to include settings from > > multiple different pin controllers. > > Yes that's fine for pinctrl_select(), but let's not do that for > runtime muxing. Hmm reading this again, you're right, there should not be anything preventing mixing multiple controllers as long as the states match. > > > + for (i = 0; i < num_pins1; i++) { > > > + int pin1 = pins1[i]; > > > + > > > + for (j = 0; j < num_pins2; j++) { > > > + int pin2 = pins2[j]; > > > + > > > + if (pin1 == pin2) { > > > + found++; > > > + break; > > > + } > > > + } > > > + } > > > + > > > + if (found != num_pins1) { > > > > I guess this make sure that every entry in the dynamic state is in the > > state state, but not vice-versa; the static state can affect more stuff > > than the dynamic state? > > > > If so, shouldn't that check be if (found != num_pins2)? > > The check is that idle_state and sleep_state pins must match the > active_state pins. This is intentionally different from the current > pinctrl_select() logic. And here things will get messed up if the order of settings is diffrent.. So yes, pinctrl_check_dynamic() needs more work. Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-18 7:25 ` Tony Lindgren 2013-07-18 10:53 ` Tony Lindgren @ 2013-07-18 19:21 ` Stephen Warren 2013-07-19 7:29 ` Tony Lindgren 1 sibling, 1 reply; 40+ messages in thread From: Stephen Warren @ 2013-07-18 19:21 UTC (permalink / raw) To: Tony Lindgren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel On 07/18/2013 01:25 AM, Tony Lindgren wrote: > * Stephen Warren <swarren@wwwdotorg.org> [130717 14:21]: >> On 07/16/2013 03:05 AM, Tony Lindgren wrote: >>> To toggle dynamic states, let's add the optional active state in >>> addition to the static default state. Then if the optional active >>> state is defined, we can require that idle and sleep states cover >>> the same pingroups as the active state. >>> >>> Then let's add pinctrl_check_dynamic() and pinctrl_select_dynamic() >>> to use instead of pinctrl_select() to avoid breaking existing users. >>> >>> With pinctrl_check_dynamic() we can check that idle and sleep states >>> match the active state for pingroups during init, and don't need to >>> do it during runtime. >>> >>> Then with the states pre-validated, pinctrl_select_dynamic() can >>> just toggle between the dynamic states without extra checks. >>> >>> Note that pinctr_select_state() still has valid use cases, such as >>> changing states when the pins can be shared between two drivers >>> and don't necessarily cover the same pingroups. For dynamic runtime >>> toggling of pin states, we should eventually always use just >>> pinctrl_select_dynamic(). >>> @@ -1241,7 +1371,13 @@ static int pinctrl_pm_select_state(struct device *dev, struct pinctrl_state *sta >>> return 0; >>> if (IS_ERR(state)) >>> return 0; /* No such state */ >>> - ret = pinctrl_select_state(pins->p, state); >>> + >>> + /* Configured for proper dynamic muxing? */ >>> + if (!IS_ERR(dev->pins->active_state)) >>> + ret = pinctrl_select_dynamic(pins->p, state); >>> + else >>> + ret = pinctrl_select_state(pins->p, state); >> >> Hmmm. I'm not quite sure this is right... Surely this function should >> just do nothing if the dynamic states aren't defined? The system should >> just, and only, be in the "default" state and never do anything else. > > This keeps the existing behaviour. We should be able to drop the > call to pinctrl_select_state() here after the existing use in > drivers has been fixed. How many DT-based systems already have multiple of default/idle/sleep states defined in DT? Right now, since the kernel code uses pinctrl_select_state() to switch between those, the state definitions need to define /all/ pins used by those states, not just the dynamic ones. However, with this series in place, the default state should only include the static pins, and the active/idle/sleep states should only include the dynamic pins. That's a change to the DT bindings, since it changes how the DT must be written, and causes older DTs to be incompatible with newer kernels and vice-versa. So, do we just ignore this DT ABI change again, or insist on doing it in some compatible way? DT ABI-ness is a PITA:-( ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-18 19:21 ` Stephen Warren @ 2013-07-19 7:29 ` Tony Lindgren 2013-07-19 18:52 ` Stephen Warren 0 siblings, 1 reply; 40+ messages in thread From: Tony Lindgren @ 2013-07-19 7:29 UTC (permalink / raw) To: Stephen Warren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel * Stephen Warren <swarren@wwwdotorg.org> [130718 12:27]: > On 07/18/2013 01:25 AM, Tony Lindgren wrote: > > * Stephen Warren <swarren@wwwdotorg.org> [130717 14:21]: > >> On 07/16/2013 03:05 AM, Tony Lindgren wrote: > >>> To toggle dynamic states, let's add the optional active state in > >>> addition to the static default state. Then if the optional active > >>> state is defined, we can require that idle and sleep states cover > >>> the same pingroups as the active state. > >>> > >>> Then let's add pinctrl_check_dynamic() and pinctrl_select_dynamic() > >>> to use instead of pinctrl_select() to avoid breaking existing users. > >>> > >>> With pinctrl_check_dynamic() we can check that idle and sleep states > >>> match the active state for pingroups during init, and don't need to > >>> do it during runtime. > >>> > >>> Then with the states pre-validated, pinctrl_select_dynamic() can > >>> just toggle between the dynamic states without extra checks. > >>> > >>> Note that pinctr_select_state() still has valid use cases, such as > >>> changing states when the pins can be shared between two drivers > >>> and don't necessarily cover the same pingroups. For dynamic runtime > >>> toggling of pin states, we should eventually always use just > >>> pinctrl_select_dynamic(). > > >>> @@ -1241,7 +1371,13 @@ static int pinctrl_pm_select_state(struct device *dev, struct pinctrl_state *sta > >>> return 0; > >>> if (IS_ERR(state)) > >>> return 0; /* No such state */ > >>> - ret = pinctrl_select_state(pins->p, state); > >>> + > >>> + /* Configured for proper dynamic muxing? */ > >>> + if (!IS_ERR(dev->pins->active_state)) > >>> + ret = pinctrl_select_dynamic(pins->p, state); > >>> + else > >>> + ret = pinctrl_select_state(pins->p, state); > >> > >> Hmmm. I'm not quite sure this is right... Surely this function should > >> just do nothing if the dynamic states aren't defined? The system should > >> just, and only, be in the "default" state and never do anything else. > > > > This keeps the existing behaviour. We should be able to drop the > > call to pinctrl_select_state() here after the existing use in > > drivers has been fixed. > > How many DT-based systems already have multiple of default/idle/sleep > states defined in DT? Right now, since the kernel code uses > pinctrl_select_state() to switch between those, the state definitions > need to define /all/ pins used by those states, not just the dynamic > ones. However, with this series in place, the default state should only > include the static pins, and the active/idle/sleep states should only > include the dynamic pins. That's a change to the DT bindings, since it > changes how the DT must be written, and causes older DTs to be > incompatible with newer kernels and vice-versa. Well we can keep the current behaviour with pinctrl_select_state() around as long as needed. For the legacy cases, there is no active state defined and we fall back to pinctrl_select_state(). > So, do we just ignore this DT ABI change again, or insist on doing it in > some compatible way? DT ABI-ness is a PITA:-( I'd vote for keeping the existing behaviour with pinctrl_select_state() when no active state is defined. Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-19 7:29 ` Tony Lindgren @ 2013-07-19 18:52 ` Stephen Warren 2013-07-29 9:05 ` Tony Lindgren 0 siblings, 1 reply; 40+ messages in thread From: Stephen Warren @ 2013-07-19 18:52 UTC (permalink / raw) To: Tony Lindgren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel On 07/19/2013 01:29 AM, Tony Lindgren wrote: > * Stephen Warren <swarren@wwwdotorg.org> [130718 12:27]: >> On 07/18/2013 01:25 AM, Tony Lindgren wrote: >>> * Stephen Warren <swarren@wwwdotorg.org> [130717 14:21]: >>>> On 07/16/2013 03:05 AM, Tony Lindgren wrote: >>>>> To toggle dynamic states, let's add the optional active state in >>>>> addition to the static default state. Then if the optional active >>>>> state is defined, we can require that idle and sleep states cover >>>>> the same pingroups as the active state. >>>>> >>>>> Then let's add pinctrl_check_dynamic() and pinctrl_select_dynamic() >>>>> to use instead of pinctrl_select() to avoid breaking existing users. >>>>> >>>>> With pinctrl_check_dynamic() we can check that idle and sleep states >>>>> match the active state for pingroups during init, and don't need to >>>>> do it during runtime. >>>>> >>>>> Then with the states pre-validated, pinctrl_select_dynamic() can >>>>> just toggle between the dynamic states without extra checks. >>>>> >>>>> Note that pinctr_select_state() still has valid use cases, such as >>>>> changing states when the pins can be shared between two drivers >>>>> and don't necessarily cover the same pingroups. For dynamic runtime >>>>> toggling of pin states, we should eventually always use just >>>>> pinctrl_select_dynamic(). >> >>>>> @@ -1241,7 +1371,13 @@ static int pinctrl_pm_select_state(struct device *dev, struct pinctrl_state *sta >>>>> return 0; >>>>> if (IS_ERR(state)) >>>>> return 0; /* No such state */ >>>>> - ret = pinctrl_select_state(pins->p, state); >>>>> + >>>>> + /* Configured for proper dynamic muxing? */ >>>>> + if (!IS_ERR(dev->pins->active_state)) >>>>> + ret = pinctrl_select_dynamic(pins->p, state); >>>>> + else >>>>> + ret = pinctrl_select_state(pins->p, state); >>>> >>>> Hmmm. I'm not quite sure this is right... Surely this function should >>>> just do nothing if the dynamic states aren't defined? The system should >>>> just, and only, be in the "default" state and never do anything else. >>> >>> This keeps the existing behaviour. We should be able to drop the >>> call to pinctrl_select_state() here after the existing use in >>> drivers has been fixed. >> >> How many DT-based systems already have multiple of default/idle/sleep >> states defined in DT? Right now, since the kernel code uses >> pinctrl_select_state() to switch between those, the state definitions >> need to define /all/ pins used by those states, not just the dynamic >> ones. However, with this series in place, the default state should only >> include the static pins, and the active/idle/sleep states should only >> include the dynamic pins. That's a change to the DT bindings, since it >> changes how the DT must be written, and causes older DTs to be >> incompatible with newer kernels and vice-versa. > > Well we can keep the current behaviour with pinctrl_select_state() around > as long as needed. For the legacy cases, there is no active state defined > and we fall back to pinctrl_select_state(). > >> So, do we just ignore this DT ABI change again, or insist on doing it in >> some compatible way? DT ABI-ness is a PITA:-( > > I'd vote for keeping the existing behaviour with pinctrl_select_state() > when no active state is defined. Yes, I think that will work, since the active state cannot exist before this new scheme is in place. But, this needs to be very clearly spell out in the DT binding documentation: If you have states default/idle/sleep, they're complete alternatives, whereas if you have states default/active/idle/sleep, the latter 3 are alternatives that build on top of the first. I foresee mass confusion, but perhaps I'm being pessimistic. ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-19 18:52 ` Stephen Warren @ 2013-07-29 9:05 ` Tony Lindgren 2013-07-29 22:01 ` Stephen Warren 0 siblings, 1 reply; 40+ messages in thread From: Tony Lindgren @ 2013-07-29 9:05 UTC (permalink / raw) To: Stephen Warren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel * Stephen Warren <swarren@wwwdotorg.org> [130719 11:59]: > On 07/19/2013 01:29 AM, Tony Lindgren wrote: > > > > I'd vote for keeping the existing behaviour with pinctrl_select_state() > > when no active state is defined. > > Yes, I think that will work, since the active state cannot exist before > this new scheme is in place. Right. > But, this needs to be very clearly spell out in the DT binding > documentation: If you have states default/idle/sleep, they're complete > alternatives, whereas if you have states default/active/idle/sleep, the > latter 3 are alternatives that build on top of the first. I foresee mass > confusion, but perhaps I'm being pessimistic. I'm hoping we can automate the runtime PM handling with default/active/idle completely from the consumer driver point of view. And then when that's working, we can probably deprecate any runtime PM related handling using pinctr_select_state() and print warnings. And we can also improve the documentation so no new users will use the default/idle/sleep for runtime PM unless they really want to. Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-29 9:05 ` Tony Lindgren @ 2013-07-29 22:01 ` Stephen Warren 2013-08-14 16:41 ` Linus Walleij 0 siblings, 1 reply; 40+ messages in thread From: Stephen Warren @ 2013-07-29 22:01 UTC (permalink / raw) To: Tony Lindgren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel On 07/29/2013 03:05 AM, Tony Lindgren wrote: > * Stephen Warren <swarren@wwwdotorg.org> [130719 11:59]: >> On 07/19/2013 01:29 AM, Tony Lindgren wrote: >>> >>> I'd vote for keeping the existing behaviour with pinctrl_select_state() >>> when no active state is defined. >> >> Yes, I think that will work, since the active state cannot exist before >> this new scheme is in place. > > Right. > >> But, this needs to be very clearly spell out in the DT binding >> documentation: If you have states default/idle/sleep, they're complete >> alternatives, whereas if you have states default/active/idle/sleep, the >> latter 3 are alternatives that build on top of the first. I foresee mass >> confusion, but perhaps I'm being pessimistic. > > I'm hoping we can automate the runtime PM handling with default/active/idle > completely from the consumer driver point of view. And then when that's > working, we can probably deprecate any runtime PM related handling using > pinctr_select_state() and print warnings. And we can also improve the > documentation so no new users will use the default/idle/sleep for runtime > PM unless they really want to. I was thinking more about people writing the device trees that define these states; they need to explicitly make the choice re: overlapping states or independent states. We should not plan to obsolete any current usage of overlapping states since that will mean an incompatible change to the DT ABI (deprecate yes so that no more usage is added, but the kernel should still support the old way). ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-29 22:01 ` Stephen Warren @ 2013-08-14 16:41 ` Linus Walleij 0 siblings, 0 replies; 40+ messages in thread From: Linus Walleij @ 2013-08-14 16:41 UTC (permalink / raw) To: Stephen Warren; +Cc: Tony Lindgren, Linux-OMAP, linux-kernel, linux-arm-kernel On Tue, Jul 30, 2013 at 12:01 AM, Stephen Warren <swarren@wwwdotorg.org> wrote: > I was thinking more about people writing the device trees that define > these states; they need to explicitly make the choice re: overlapping > states or independent states. We should not plan to obsolete any current > usage of overlapping states since that will mean an incompatible change > to the DT ABI (deprecate yes so that no more usage is added, but the > kernel should still support the old way). This is another reason to not group and encode explicitly the pins that remain unchanged during state transitions. I prefer that either: - when we build up the state containers in the subsystem, we identify overlapping pins and encode them in the state container somehow or: - when transitioning from state A -> state B we identify ovelapping pins or groups of pins and do not touch them by making calls down to the driver ->free() and ->request() callback pair. or: the pinctrl-single.c driver in it's callbacks like ->enable() ->disable(), ->request(), ->free() internally short cuts from its knowledge of such pin shortcuts and no other drivers are affected (nor helped) by this optimization. Yours, Linus Walleij ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-16 9:05 ` [PATCH 3/4] pinctrl: Add support for additional dynamic states Tony Lindgren 2013-07-16 9:35 ` Felipe Balbi 2013-07-17 21:14 ` Stephen Warren @ 2013-07-17 21:23 ` Stephen Warren 2013-07-18 7:36 ` Tony Lindgren 2013-07-22 23:07 ` Linus Walleij 3 siblings, 1 reply; 40+ messages in thread From: Stephen Warren @ 2013-07-17 21:23 UTC (permalink / raw) To: Tony Lindgren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel On 07/16/2013 03:05 AM, Tony Lindgren wrote: > To toggle dynamic states, let's add the optional active state in > addition to the static default state. Then if the optional active > state is defined, we can require that idle and sleep states cover > the same pingroups as the active state. > > Then let's add pinctrl_check_dynamic() and pinctrl_select_dynamic() > to use instead of pinctrl_select() to avoid breaking existing users. > > With pinctrl_check_dynamic() we can check that idle and sleep states > match the active state for pingroups during init, and don't need to > do it during runtime. > > Then with the states pre-validated, pinctrl_select_dynamic() can > just toggle between the dynamic states without extra checks. > > Note that pinctr_select_state() still has valid use cases, such as > changing states when the pins can be shared between two drivers > and don't necessarily cover the same pingroups. For dynamic runtime > toggling of pin states, we should eventually always use just > pinctrl_select_dynamic(). Something in this series should edit Documentation/pinctrl.txt to explain the philosophy behind the static/dynamic state split. That philosophy and/or semantics are more important to review than the code... Related to that, I'm worried that using pinctrl_select_state() and pinctrl_select_dynamic() appear to be mutually-exclusive options here. Why shouldn't e.g. a pinctrl-based I2C mux also be able to do runtime PM? Does the mux setting select which states are used for runtime PM, or does runtime PM override the basic mux setting, or must the pincrl-I2C mux manually implement custom runtime-PM/pinctrl interaction since there's no generic answer to those questions? How many more custom exceptions will there be? ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-17 21:23 ` Stephen Warren @ 2013-07-18 7:36 ` Tony Lindgren 2013-07-18 19:26 ` Stephen Warren 0 siblings, 1 reply; 40+ messages in thread From: Tony Lindgren @ 2013-07-18 7:36 UTC (permalink / raw) To: Stephen Warren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel * Stephen Warren <swarren@wwwdotorg.org> [130717 14:30]: > On 07/16/2013 03:05 AM, Tony Lindgren wrote: > > To toggle dynamic states, let's add the optional active state in > > addition to the static default state. Then if the optional active > > state is defined, we can require that idle and sleep states cover > > the same pingroups as the active state. > > > > Then let's add pinctrl_check_dynamic() and pinctrl_select_dynamic() > > to use instead of pinctrl_select() to avoid breaking existing users. > > > > With pinctrl_check_dynamic() we can check that idle and sleep states > > match the active state for pingroups during init, and don't need to > > do it during runtime. > > > > Then with the states pre-validated, pinctrl_select_dynamic() can > > just toggle between the dynamic states without extra checks. > > > > Note that pinctr_select_state() still has valid use cases, such as > > changing states when the pins can be shared between two drivers > > and don't necessarily cover the same pingroups. For dynamic runtime > > toggling of pin states, we should eventually always use just > > pinctrl_select_dynamic(). > > Something in this series should edit Documentation/pinctrl.txt to > explain the philosophy behind the static/dynamic state split. That > philosophy and/or semantics are more important to review than the code... Sure, I'll write up something on that. > Related to that, I'm worried that using pinctrl_select_state() and > pinctrl_select_dynamic() appear to be mutually-exclusive options here. Not currently, but eventually I think that's a good idea. We should use pinctrl_select_state() only during init time eventually because of the diffing of states it does. > Why shouldn't e.g. a pinctrl-based I2C mux also be able to do runtime > PM? Does the mux setting select which states are used for runtime PM, or > does runtime PM override the basic mux setting, or must the pincrl-I2C > mux manually implement custom runtime-PM/pinctrl interaction since > there's no generic answer to those questions? How many more custom > exceptions will there be? The idea is that runtime PM will never touch the basic mux settings at all. The "default" state should be considered a static state that is claimed during driver probe, and released when the driver is unloaded. This is typically let's say 90% of the pins for any device. For runtime PM, we can just toggle the PM related pinctrl states as they have been verified to match the active state during init. So I don't see why pinctrl-I2C would have to do anything specific. All that is required is that the pins are grouped for the consumer driver, and we can provide some automated checks on the states for runtime PM. Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-18 7:36 ` Tony Lindgren @ 2013-07-18 19:26 ` Stephen Warren 2013-07-19 7:39 ` Tony Lindgren 0 siblings, 1 reply; 40+ messages in thread From: Stephen Warren @ 2013-07-18 19:26 UTC (permalink / raw) To: Tony Lindgren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel On 07/18/2013 01:36 AM, Tony Lindgren wrote: > * Stephen Warren <swarren@wwwdotorg.org> [130717 14:30]: >> On 07/16/2013 03:05 AM, Tony Lindgren wrote: ... >> Why shouldn't e.g. a pinctrl-based I2C mux also be able to do runtime >> PM? Does the mux setting select which states are used for runtime PM, or >> does runtime PM override the basic mux setting, or must the pincrl-I2C >> mux manually implement custom runtime-PM/pinctrl interaction since >> there's no generic answer to those questions? How many more custom >> exceptions will there be? > > The idea is that runtime PM will never touch the basic mux settings > at all. The "default" state should be considered a static state > that is claimed during driver probe, and released when the driver > is unloaded. This is typically let's say 90% of the pins for any > device. > > For runtime PM, we can just toggle the PM related pinctrl states as > they have been verified to match the active state during init. > > So I don't see why pinctrl-I2C would have to do anything specific. > All that is required is that the pins are grouped for the consumer > driver, and we can provide some automated checks on the states for > runtime PM. So, consider a pinctrl-based I2C mux. It has 2 states to cover two I2C buses: a) bus 1: I2C controller is muxed out onto one set of pins. b) bus 2: I2C controller is muxed out onto another set of pins. Now, the system could go idle in either of those 2 states, and then later need to return to one of those states. I just don't see how that would work, since the runtime PM code in this series switches to *an* active state when the device becomes non-idle. If the definition of the idle state switches the mux function for both sets of pins to some idle/quiescent value, then you'd need to do different reprogramming when going back to "the" active state; I guess the system would need to remember which state was active before switching to idle, then switch back to that same state rather than hard-coding the active state name as "active"... ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-18 19:26 ` Stephen Warren @ 2013-07-19 7:39 ` Tony Lindgren 2013-07-19 10:29 ` Grygorii Strashko 2013-07-19 18:58 ` Stephen Warren 0 siblings, 2 replies; 40+ messages in thread From: Tony Lindgren @ 2013-07-19 7:39 UTC (permalink / raw) To: Stephen Warren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel * Stephen Warren <swarren@wwwdotorg.org> [130718 12:33]: > On 07/18/2013 01:36 AM, Tony Lindgren wrote: > > * Stephen Warren <swarren@wwwdotorg.org> [130717 14:30]: > >> On 07/16/2013 03:05 AM, Tony Lindgren wrote: > ... > >> Why shouldn't e.g. a pinctrl-based I2C mux also be able to do runtime > >> PM? Does the mux setting select which states are used for runtime PM, or > >> does runtime PM override the basic mux setting, or must the pincrl-I2C > >> mux manually implement custom runtime-PM/pinctrl interaction since > >> there's no generic answer to those questions? How many more custom > >> exceptions will there be? > > > > The idea is that runtime PM will never touch the basic mux settings > > at all. The "default" state should be considered a static state > > that is claimed during driver probe, and released when the driver > > is unloaded. This is typically let's say 90% of the pins for any > > device. > > > > For runtime PM, we can just toggle the PM related pinctrl states as > > they have been verified to match the active state during init. > > > > So I don't see why pinctrl-I2C would have to do anything specific. > > All that is required is that the pins are grouped for the consumer > > driver, and we can provide some automated checks on the states for > > runtime PM. > > So, consider a pinctrl-based I2C mux. It has 2 states to cover two I2C > buses: > > a) bus 1: I2C controller is muxed out onto one set of pins. > > b) bus 2: I2C controller is muxed out onto another set of pins. > > Now, the system could go idle in either of those 2 states, and then > later need to return to one of those states. I just don't see how that > would work, since the runtime PM code in this series switches to *an* > active state when the device becomes non-idle. If the definition of the > idle state switches the mux function for both sets of pins to some > idle/quiescent value, then you'd need to do different reprogramming when > going back to "the" active state; I guess the system would need to > remember which state was active before switching to idle, then switch > back to that same state rather than hard-coding the active state name as > "active"... I think the only sane way to deal with this is to make the I2C controller to show up as two separate I2C controller instances. Then use runtime PM to save and restore the state for each instance, and locking between the two driver instances. For the pin muxing part, I'd do this: i2c1 instance i2c2 instance notes default_state 0 pins 0 pins (or dedicated pins only) active_state all pins alls pins idle_state safe mode safe mode Then when i2c1 instance is done, it's runtime PM suspend muxes the pins to safe mode, or some nop state. Then when i2c2 instance is woken, it's runtime PM resume muxes pins to i2c2. Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-19 7:39 ` Tony Lindgren @ 2013-07-19 10:29 ` Grygorii Strashko 2013-07-19 19:03 ` Stephen Warren 2013-07-19 18:58 ` Stephen Warren 1 sibling, 1 reply; 40+ messages in thread From: Grygorii Strashko @ 2013-07-19 10:29 UTC (permalink / raw) To: Tony Lindgren Cc: Stephen Warren, linus.walleij, linux-omap, linux-kernel, linux-arm-kernel Hi Tony, Stephen On 07/19/2013 10:39 AM, Tony Lindgren wrote: > * Stephen Warren <swarren@wwwdotorg.org> [130718 12:33]: >> On 07/18/2013 01:36 AM, Tony Lindgren wrote: >>> * Stephen Warren <swarren@wwwdotorg.org> [130717 14:30]: >>>> On 07/16/2013 03:05 AM, Tony Lindgren wrote: >> ... >>>> Why shouldn't e.g. a pinctrl-based I2C mux also be able to do runtime >>>> PM? Does the mux setting select which states are used for runtime PM, or >>>> does runtime PM override the basic mux setting, or must the pincrl-I2C >>>> mux manually implement custom runtime-PM/pinctrl interaction since >>>> there's no generic answer to those questions? How many more custom >>>> exceptions will there be? >>> >>> The idea is that runtime PM will never touch the basic mux settings >>> at all. The "default" state should be considered a static state >>> that is claimed during driver probe, and released when the driver >>> is unloaded. This is typically let's say 90% of the pins for any >>> device. >>> >>> For runtime PM, we can just toggle the PM related pinctrl states as >>> they have been verified to match the active state during init. >>> >>> So I don't see why pinctrl-I2C would have to do anything specific. >>> All that is required is that the pins are grouped for the consumer >>> driver, and we can provide some automated checks on the states for >>> runtime PM. >> >> So, consider a pinctrl-based I2C mux. It has 2 states to cover two I2C >> buses: >> >> a) bus 1: I2C controller is muxed out onto one set of pins. >> >> b) bus 2: I2C controller is muxed out onto another set of pins. >> >> Now, the system could go idle in either of those 2 states, and then >> later need to return to one of those states. I just don't see how that >> would work, since the runtime PM code in this series switches to *an* >> active state when the device becomes non-idle. If the definition of the >> idle state switches the mux function for both sets of pins to some >> idle/quiescent value, then you'd need to do different reprogramming when >> going back to "the" active state; I guess the system would need to >> remember which state was active before switching to idle, then switch >> back to that same state rather than hard-coding the active state name as >> "active"... > > I think the only sane way to deal with this is to make the I2C controller > to show up as two separate I2C controller instances. Then use runtime > PM to save and restore the state for each instance, and locking between > the two driver instances. > > For the pin muxing part, I'd do this: > > i2c1 instance i2c2 instance notes > default_state 0 pins 0 pins (or dedicated pins only) > active_state all pins alls pins > idle_state safe mode safe mode > > Then when i2c1 instance is done, it's runtime PM suspend muxes the pins > to safe mode, or some nop state. Then when i2c2 instance is woken, it's > runtime PM resume muxes pins to i2c2. First of all, I'd like to mention that these patches do *not* connect pinctrl to PM runtime, so until driver will call pinctrl_select_state() or pinctrl_pm_select_*() there will be no pins state changes. (As result, i2c-mux is not good example, seems:)) And I think, some sort of summary need to be done to explain how system will behave after these patches in comparison to how it was before: 1) Device has pins states defined and driver uses pinctrl_select_state (lets say legacy mode): - "default" - no changes - "default"+"idle"/"sleep" - no changes - "default" + any other states - no chages - "default"+"active" + "idle"/"sleep" - behavior will be *changed* pinctrl_bind_pins() will do: a) pinctrl_select_state("default") b) pinctrl_select_dynamic("active") but, driver uses pinctrl_select_state() to change pins state during its work -- Is it ok? 2) Device has pins states defined and driver uses pinctrl_pm_select_*() API only: - if no "active" defined - behavior will be the same as for legacy mode - "default"+"active" + "idle"/"sleep" - will behave as explained in doc 3) Device has pins states defined and driver uses pinctrl_pm_select_*() API and pinctrl_select_state() simultaneously: - if no "active" defined - behavior will be the same as for legacy mode - "default"+"active" + "idle"/"sleep" + "stateX" How it will work if during suspend driver will do:?? if (conditionY) pinctrl_select_state(stateX); pinctrl_pm_select_sleep_state("sleep") Is it valid? How it will work if during runtime resuming driver will do:?? if (conditionY) pinctrl_select_state(stateX); pinctrl_pm_select_active_state("active"); Is it valid? Any way, if driver don't want support introduced default/common behavior - all it need is to not define "active" state. Uh, hope it will be useful and I have correct understandings here :) > > Regards, > > Tony Regards, - grygorii ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-19 10:29 ` Grygorii Strashko @ 2013-07-19 19:03 ` Stephen Warren 2013-07-22 23:15 ` Linus Walleij 2013-07-29 9:08 ` Tony Lindgren 0 siblings, 2 replies; 40+ messages in thread From: Stephen Warren @ 2013-07-19 19:03 UTC (permalink / raw) To: Grygorii Strashko Cc: Tony Lindgren, linus.walleij, linux-omap, linux-kernel, linux-arm-kernel On 07/19/2013 04:29 AM, Grygorii Strashko wrote: > Hi Tony, Stephen > > On 07/19/2013 10:39 AM, Tony Lindgren wrote: >> * Stephen Warren <swarren@wwwdotorg.org> [130718 12:33]: >>> On 07/18/2013 01:36 AM, Tony Lindgren wrote: >>>> * Stephen Warren <swarren@wwwdotorg.org> [130717 14:30]: >>>>> On 07/16/2013 03:05 AM, Tony Lindgren wrote: >>> ... >>>>> Why shouldn't e.g. a pinctrl-based I2C mux also be able to do runtime >>>>> PM? Does the mux setting select which states are used for runtime >>>>> PM, or >>>>> does runtime PM override the basic mux setting, or must the pincrl-I2C >>>>> mux manually implement custom runtime-PM/pinctrl interaction since >>>>> there's no generic answer to those questions? How many more custom >>>>> exceptions will there be? >>>> >>>> The idea is that runtime PM will never touch the basic mux settings >>>> at all. The "default" state should be considered a static state >>>> that is claimed during driver probe, and released when the driver >>>> is unloaded. This is typically let's say 90% of the pins for any >>>> device. >>>> >>>> For runtime PM, we can just toggle the PM related pinctrl states as >>>> they have been verified to match the active state during init. >>>> >>>> So I don't see why pinctrl-I2C would have to do anything specific. >>>> All that is required is that the pins are grouped for the consumer >>>> driver, and we can provide some automated checks on the states for >>>> runtime PM. >>> >>> So, consider a pinctrl-based I2C mux. It has 2 states to cover two I2C >>> buses: >>> >>> a) bus 1: I2C controller is muxed out onto one set of pins. >>> >>> b) bus 2: I2C controller is muxed out onto another set of pins. >>> >>> Now, the system could go idle in either of those 2 states, and then >>> later need to return to one of those states. I just don't see how that >>> would work, since the runtime PM code in this series switches to *an* >>> active state when the device becomes non-idle. If the definition of the >>> idle state switches the mux function for both sets of pins to some >>> idle/quiescent value, then you'd need to do different reprogramming when >>> going back to "the" active state; I guess the system would need to >>> remember which state was active before switching to idle, then switch >>> back to that same state rather than hard-coding the active state name as >>> "active"... >> >> I think the only sane way to deal with this is to make the I2C controller >> to show up as two separate I2C controller instances. Then use runtime >> PM to save and restore the state for each instance, and locking between >> the two driver instances. >> >> For the pin muxing part, I'd do this: >> >> i2c1 instance i2c2 instance notes >> default_state 0 pins 0 pins (or dedicated pins only) >> active_state all pins alls pins >> idle_state safe mode safe mode >> >> Then when i2c1 instance is done, it's runtime PM suspend muxes the pins >> to safe mode, or some nop state. Then when i2c2 instance is woken, it's >> runtime PM resume muxes pins to i2c2. > > First of all, I'd like to mention that these patches do *not* connect > pinctrl to PM runtime, so until driver will call pinctrl_select_state() > or pinctrl_pm_select_*() there will be no pins state changes. Isn't the whole point of the pinctrl_pm_select*() APIs to eventually be called automatically by the runtime PM core, so that we don't need to write code to do this in every single driver, just like we moved the call to pinctrl_select_state(default) into the device core so that we didn't have to make every device do that manually? > (As result, i2c-mux is not good example, seems:)) As such, I think all situations are good examples, because a generic feature has to work in all cases. The description you gave of the behavioural changes this patch creates seems accurate at a quick glance. ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-19 19:03 ` Stephen Warren @ 2013-07-22 23:15 ` Linus Walleij 2013-07-29 9:08 ` Tony Lindgren 1 sibling, 0 replies; 40+ messages in thread From: Linus Walleij @ 2013-07-22 23:15 UTC (permalink / raw) To: Stephen Warren Cc: Grygorii Strashko, Tony Lindgren, Linux-OMAP, linux-kernel, linux-arm-kernel On Fri, Jul 19, 2013 at 9:03 PM, Stephen Warren <swarren@wwwdotorg.org> wrote: > On 07/19/2013 04:29 AM, Grygorii Strashko wrote: >> First of all, I'd like to mention that these patches do *not* connect >> pinctrl to PM runtime, so until driver will call pinctrl_select_state() >> or pinctrl_pm_select_*() there will be no pins state changes. > > Isn't the whole point of the pinctrl_pm_select*() APIs to eventually be > called automatically by the runtime PM core, Nah I had no such complete ambitions, just factoring around. There are examples, such as deactivating a TTY from userspace, that should result in the pins going to sleep while it may have nothing to do with runtime PM. > so that we don't need to > write code to do this in every single driver, just like we moved the > call to pinctrl_select_state(default) into the device core so that we > didn't have to make every device do that manually? I am pretty convinced that if this dynamic muxing stuff shall be implemented, it should be a pinctrl subsystem intrinsic optimization detail and should not be exposed to the outside with all these extra functions at all. It looks overly complicated to me. Yours, Linus Walleij ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-19 19:03 ` Stephen Warren 2013-07-22 23:15 ` Linus Walleij @ 2013-07-29 9:08 ` Tony Lindgren 1 sibling, 0 replies; 40+ messages in thread From: Tony Lindgren @ 2013-07-29 9:08 UTC (permalink / raw) To: Stephen Warren Cc: Grygorii Strashko, linus.walleij, linux-omap, linux-kernel, linux-arm-kernel * Stephen Warren <swarren@wwwdotorg.org> [130719 12:10]: > On 07/19/2013 04:29 AM, Grygorii Strashko wrote: > > > > First of all, I'd like to mention that these patches do *not* connect > > pinctrl to PM runtime, so until driver will call pinctrl_select_state() > > or pinctrl_pm_select_*() there will be no pins state changes. > > Isn't the whole point of the pinctrl_pm_select*() APIs to eventually be > called automatically by the runtime PM core, so that we don't need to > write code to do this in every single driver, just like we moved the > call to pinctrl_select_state(default) into the device core so that we > didn't have to make every device do that manually? Yes I think we can make it all automatic. So far it seems that the last missing piece was Linus' suggestion of making it mostly happen using irqchip with calls to pinctrl so consumer drivers may not need to do anything. > > (As result, i2c-mux is not good example, seems:)) > > As such, I think all situations are good examples, because a generic > feature has to work in all cases. Yes we need to support both runtime PM, and more complex cases of sharing pins between devices for example that are not runtime PM related. Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-19 7:39 ` Tony Lindgren 2013-07-19 10:29 ` Grygorii Strashko @ 2013-07-19 18:58 ` Stephen Warren 2013-07-29 9:21 ` Tony Lindgren 1 sibling, 1 reply; 40+ messages in thread From: Stephen Warren @ 2013-07-19 18:58 UTC (permalink / raw) To: Tony Lindgren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel On 07/19/2013 01:39 AM, Tony Lindgren wrote: > * Stephen Warren <swarren@wwwdotorg.org> [130718 12:33]: >> On 07/18/2013 01:36 AM, Tony Lindgren wrote: >>> * Stephen Warren <swarren@wwwdotorg.org> [130717 14:30]: >>>> On 07/16/2013 03:05 AM, Tony Lindgren wrote: >> ... >>>> Why shouldn't e.g. a pinctrl-based I2C mux also be able to do runtime >>>> PM? Does the mux setting select which states are used for runtime PM, or >>>> does runtime PM override the basic mux setting, or must the pincrl-I2C >>>> mux manually implement custom runtime-PM/pinctrl interaction since >>>> there's no generic answer to those questions? How many more custom >>>> exceptions will there be? >>> >>> The idea is that runtime PM will never touch the basic mux settings >>> at all. The "default" state should be considered a static state >>> that is claimed during driver probe, and released when the driver >>> is unloaded. This is typically let's say 90% of the pins for any >>> device. >>> >>> For runtime PM, we can just toggle the PM related pinctrl states as >>> they have been verified to match the active state during init. >>> >>> So I don't see why pinctrl-I2C would have to do anything specific. >>> All that is required is that the pins are grouped for the consumer >>> driver, and we can provide some automated checks on the states for >>> runtime PM. >> >> So, consider a pinctrl-based I2C mux. It has 2 states to cover two I2C >> buses: >> >> a) bus 1: I2C controller is muxed out onto one set of pins. >> >> b) bus 2: I2C controller is muxed out onto another set of pins. >> >> Now, the system could go idle in either of those 2 states, and then >> later need to return to one of those states. I just don't see how that >> would work, since the runtime PM code in this series switches to *an* >> active state when the device becomes non-idle. If the definition of the >> idle state switches the mux function for both sets of pins to some >> idle/quiescent value, then you'd need to do different reprogramming when >> going back to "the" active state; I guess the system would need to >> remember which state was active before switching to idle, then switch >> back to that same state rather than hard-coding the active state name as >> "active"... > > I think the only sane way to deal with this is to make the I2C controller > to show up as two separate I2C controller instances. Then use runtime > PM to save and restore the state for each instance, and locking between > the two driver instances. > > For the pin muxing part, I'd do this: > > i2c1 instance i2c2 instance notes > default_state 0 pins 0 pins (or dedicated pins only) > active_state all pins alls pins > idle_state safe mode safe mode > > Then when i2c1 instance is done, it's runtime PM suspend muxes the pins > to safe mode, or some nop state. Then when i2c2 instance is woken, it's > runtime PM resume muxes pins to i2c2. I see two issues with that approach: 1) Runtime PM doesn't always put a device into an idle state as soon as its work is done. Sometimes (always?) there is a delay between when the device is last used and when the HW is actually made idle so that if the device is re-activated quickly, the kernel hasn't wasted time making it idle then active again. You'd have to force that delay to complete when switching between the two virtual controller devices. 2) This requires two separate device objects for the two I2C instances. I guess you could have the driver for the one I2C mux node end up instantiating two child devices for this purpose, and hence make that happen without needing to change the DT ABI. However, that sure feels complex... I wonder if it wouldn't be better to have active/idle/sleep as "modifiers" to the state name rather than alternatives, so you end up with states named: default nobus:active nobus:idle nobus:sleep bus0:active bus0:idle bus0:sleep bus1:active bus1:idle bus1:sleep Of course, if you continue on with that approach (i.e. you add more sub-fields each separated by a colon), you end up with a huge combinatorial mess of state names. ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-19 18:58 ` Stephen Warren @ 2013-07-29 9:21 ` Tony Lindgren 2013-07-29 22:08 ` Stephen Warren 0 siblings, 1 reply; 40+ messages in thread From: Tony Lindgren @ 2013-07-29 9:21 UTC (permalink / raw) To: Stephen Warren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel * Stephen Warren <swarren@wwwdotorg.org> [130719 12:05]: > On 07/19/2013 01:39 AM, Tony Lindgren wrote: > > > > I think the only sane way to deal with this is to make the I2C controller > > to show up as two separate I2C controller instances. Then use runtime > > PM to save and restore the state for each instance, and locking between > > the two driver instances. > > > > For the pin muxing part, I'd do this: > > > > i2c1 instance i2c2 instance notes > > default_state 0 pins 0 pins (or dedicated pins only) > > active_state all pins alls pins > > idle_state safe mode safe mode > > > > Then when i2c1 instance is done, it's runtime PM suspend muxes the pins > > to safe mode, or some nop state. Then when i2c2 instance is woken, it's > > runtime PM resume muxes pins to i2c2. > > I see two issues with that approach: > > 1) Runtime PM doesn't always put a device into an idle state as soon as > its work is done. Sometimes (always?) there is a delay between when the > device is last used and when the HW is actually made idle so that if the > device is re-activated quickly, the kernel hasn't wasted time making it > idle then active again. You'd have to force that delay to complete when > switching between the two virtual controller devices. There is the autosuspend timeout for delayed transitions, but I think runtime PM already has calls for making the state change immediate also. > 2) This requires two separate device objects for the two I2C instances. > I guess you could have the driver for the one I2C mux node end up > instantiating two child devices for this purpose, and hence make that > happen without needing to change the DT ABI. However, that sure feels > complex... Yes but you will also automatically get quite a bit of sanity to your I2C driver code rather than trying to handle the two separate instances within the driver alone. Consider things like scanning the I2C buses for devices and just dev_dbg(). > I wonder if it wouldn't be better to have active/idle/sleep as > "modifiers" to the state name rather than alternatives, so you end up > with states named: > > default > nobus:active > nobus:idle > nobus:sleep > bus0:active > bus0:idle > bus0:sleep > bus1:active > bus1:idle > bus1:sleep > > Of course, if you continue on with that approach (i.e. you add more > sub-fields each separated by a colon), you end up with a huge > combinatorial mess of state names. Right :) Sooner or later we'll have some totally messed up piece of hardware pop up that multiplexes one controller across a large number number buses.. Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-29 9:21 ` Tony Lindgren @ 2013-07-29 22:08 ` Stephen Warren 0 siblings, 0 replies; 40+ messages in thread From: Stephen Warren @ 2013-07-29 22:08 UTC (permalink / raw) To: Tony Lindgren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel On 07/29/2013 03:21 AM, Tony Lindgren wrote: > * Stephen Warren <swarren@wwwdotorg.org> [130719 12:05]: >> On 07/19/2013 01:39 AM, Tony Lindgren wrote: >>> >>> I think the only sane way to deal with this is to make the I2C controller >>> to show up as two separate I2C controller instances. Then use runtime >>> PM to save and restore the state for each instance, and locking between >>> the two driver instances. >>> >>> For the pin muxing part, I'd do this: >>> >>> i2c1 instance i2c2 instance notes >>> default_state 0 pins 0 pins (or dedicated pins only) >>> active_state all pins alls pins >>> idle_state safe mode safe mode >>> >>> Then when i2c1 instance is done, it's runtime PM suspend muxes the pins >>> to safe mode, or some nop state. Then when i2c2 instance is woken, it's >>> runtime PM resume muxes pins to i2c2. >> >> I see two issues with that approach: >> >> 1) Runtime PM doesn't always put a device into an idle state as soon as >> its work is done. Sometimes (always?) there is a delay between when the >> device is last used and when the HW is actually made idle so that if the >> device is re-activated quickly, the kernel hasn't wasted time making it >> idle then active again. You'd have to force that delay to complete when >> switching between the two virtual controller devices. > > There is the autosuspend timeout for delayed transitions, but I think > runtime PM already has calls for making the state change immediate also. True, but I /think/ that then you could never use the APIs that perform delayed idle, since you'd always need to force immediate idle to guarantee you could always immediately switch to the other state/virtual-controller. >> 2) This requires two separate device objects for the two I2C instances. >> I guess you could have the driver for the one I2C mux node end up >> instantiating two child devices for this purpose, and hence make that >> happen without needing to change the DT ABI. However, that sure feels >> complex... > > Yes but you will also automatically get quite a bit of sanity to your > I2C driver code rather than trying to handle the two separate instances > within the driver alone. Consider things like scanning the I2C buses for > devices and just dev_dbg(). The I2C mux is already very simple. IIRC, it instantiates a separate "struct i2c_adapter" for each "virtual" I2C controller. It actually looks like each of those already embeds its own "struct device", so perhaps this issue is a little moot. However, we'd have to find some way of redirecting pinctrl requests from those child devices to the top-level I2C mux struct device itself, since that's what the pinctrl mapping table entries are defined for. It seems much simpler to just leave the pinctrl stuff controlled by that top-level device, rather than pushing it down to the child virtual devices/adapters. ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-16 9:05 ` [PATCH 3/4] pinctrl: Add support for additional dynamic states Tony Lindgren ` (2 preceding siblings ...) 2013-07-17 21:23 ` Stephen Warren @ 2013-07-22 23:07 ` Linus Walleij 2013-07-29 9:31 ` Tony Lindgren 3 siblings, 1 reply; 40+ messages in thread From: Linus Walleij @ 2013-07-22 23:07 UTC (permalink / raw) To: Tony Lindgren; +Cc: Linux-OMAP, linux-kernel, linux-arm-kernel, Stephen Warren On Tue, Jul 16, 2013 at 11:05 AM, Tony Lindgren <tony@atomide.com> wrote: > To toggle dynamic states, let's add the optional active state in > addition to the static default state. Then if the optional active > state is defined, we can require that idle and sleep states cover > the same pingroups as the active state. OK... > Then let's add pinctrl_check_dynamic() and pinctrl_select_dynamic() > to use instead of pinctrl_select() to avoid breaking existing users. > > With pinctrl_check_dynamic() we can check that idle and sleep states > match the active state for pingroups during init, and don't need to > do it during runtime. I do not understand why this complexity need to be exposed outside of the subsystem. pinctrl_select_state() and the PM accessors are enough IMO. Why should say a driver care about whether it is dynamic or not? Surely the checking and different paths for static/dynamic configurations can be an intrinsic detail of the pinctrl subsystem, by adding flags and members to private structs like struct pinctrl itself in worst case. So I'm not buying into this, it looks like it is making things complicated for consumers outside the subsystem for no reason. Yours, Linus Walleij ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-22 23:07 ` Linus Walleij @ 2013-07-29 9:31 ` Tony Lindgren 0 siblings, 0 replies; 40+ messages in thread From: Tony Lindgren @ 2013-07-29 9:31 UTC (permalink / raw) To: Linus Walleij; +Cc: Linux-OMAP, linux-kernel, linux-arm-kernel, Stephen Warren * Linus Walleij <linus.walleij@linaro.org> [130722 16:14]: > On Tue, Jul 16, 2013 at 11:05 AM, Tony Lindgren <tony@atomide.com> wrote: > > > To toggle dynamic states, let's add the optional active state in > > addition to the static default state. Then if the optional active > > state is defined, we can require that idle and sleep states cover > > the same pingroups as the active state. > > OK... > > > Then let's add pinctrl_check_dynamic() and pinctrl_select_dynamic() > > to use instead of pinctrl_select() to avoid breaking existing users. > > > > With pinctrl_check_dynamic() we can check that idle and sleep states > > match the active state for pingroups during init, and don't need to > > do it during runtime. > > I do not understand why this complexity need to be exposed outside > of the subsystem. Unfortunately it's mostly to deal with supporting the current behaviour of pinctrl_select_state() which is not quite suitable for runtime PM. > pinctrl_select_state() and the PM accessors are enough IMO. Why > should say a driver care about whether it is dynamic or not? I think we can make this all transparent to the consumer drivers for runtime PM. Basically drivers/base/pinctrl.c needs these for the checks because of the current pinctrl_select_state(). > Surely the checking and different paths for static/dynamic configurations > can be an intrinsic detail of the pinctrl subsystem, by adding flags and > members to private structs like struct pinctrl itself in worst case. I'll take a look if we can bury more things inside the pinctrl subsystem. > So I'm not buying into this, it looks like it is making things complicated > for consumers outside the subsystem for no reason. I don't think the consumer drivers eventually need to do much anything ideally. We're missing runtime PM related set_irq_wake() but that's a minor detail as we can initially keep the runtime PM related wake-up events always enabled. Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* [PATCH 4/4] drivers: Add pinctrl handling for dynamic pin states 2013-07-16 9:05 [PATCH 0/4] improved support for runtime muxing for pinctrl Tony Lindgren ` (2 preceding siblings ...) 2013-07-16 9:05 ` [PATCH 3/4] pinctrl: Add support for additional dynamic states Tony Lindgren @ 2013-07-16 9:05 ` Tony Lindgren 2013-07-17 21:21 ` Stephen Warren 2013-07-16 9:14 ` [PATCH 0/4] improved support for runtime muxing for pinctrl Tony Lindgren 2013-07-17 11:49 ` Grygorii Strashko 5 siblings, 1 reply; 40+ messages in thread From: Tony Lindgren @ 2013-07-16 9:05 UTC (permalink / raw) To: linus.walleij Cc: Greg Kroah-Hartman, linux-omap, linux-kernel, linux-arm-kernel, Stephen Warren We want to have static pin states handled separately from dynamic pin states, so let's add optional state_active. Then if state_active is defined, let's check and make sure state_idle and state_sleep match state_active for the pin groups to avoid checking them during runtime as the active and idle pins may need to be toggled for many devices every time we enter and exit idle. Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Tony Lindgren <tony@atomide.com> --- drivers/base/pinctrl.c | 39 +++++++++++++++++++++++++++++++++++++-- 1 file changed, 37 insertions(+), 2 deletions(-) diff --git a/drivers/base/pinctrl.c b/drivers/base/pinctrl.c index 5fb74b4..49644ed 100644 --- a/drivers/base/pinctrl.c +++ b/drivers/base/pinctrl.c @@ -34,6 +34,7 @@ int pinctrl_bind_pins(struct device *dev) goto cleanup_alloc; } + /* Default static pins that don't need to change */ dev->pins->default_state = pinctrl_lookup_state(dev->pins->p, PINCTRL_STATE_DEFAULT); if (IS_ERR(dev->pins->default_state)) { @@ -48,23 +49,57 @@ int pinctrl_bind_pins(struct device *dev) goto cleanup_get; } + /* Optional runtime dynamic pins in addition to the static pins */ + dev->pins->active_state = pinctrl_lookup_state(dev->pins->p, + PINCTRL_STATE_ACTIVE); + if (IS_ERR(dev->pins->active_state)) { + /* Not supplying this state is perfectly legal */ + dev_dbg(dev, "no active pinctrl state\n"); + } else { + ret = pinctrl_select_dynamic(dev->pins->p, + dev->pins->active_state); + if (ret) { + dev_dbg(dev, "failed to select active pinctrl state\n"); + goto cleanup_get; + } + } + #ifdef CONFIG_PM /* * If power management is enabled, we also look for the optional * sleep and idle pin states, with semantics as defined in * <linux/pinctrl/pinctrl-state.h> + * + * Note that if active state is defined, sleep and idle states must + * cover the same pin groups as active state. */ dev->pins->sleep_state = pinctrl_lookup_state(dev->pins->p, PINCTRL_STATE_SLEEP); - if (IS_ERR(dev->pins->sleep_state)) + if (IS_ERR(dev->pins->sleep_state)) { /* Not supplying this state is perfectly legal */ dev_dbg(dev, "no sleep pinctrl state\n"); + } else if (!IS_ERR(dev->pins->active_state)) { + ret = pinctrl_check_dynamic(dev, dev->pins->active_state, + dev->pins->sleep_state); + if (ret) { + dev_err(dev, "sleep state groups do not match active state\n"); + dev->pins->sleep_state = ERR_PTR(-EINVAL); + } + } dev->pins->idle_state = pinctrl_lookup_state(dev->pins->p, PINCTRL_STATE_IDLE); - if (IS_ERR(dev->pins->idle_state)) + if (IS_ERR(dev->pins->idle_state)) { /* Not supplying this state is perfectly legal */ dev_dbg(dev, "no idle pinctrl state\n"); + } else if (!IS_ERR(dev->pins->active_state)) { + ret = pinctrl_check_dynamic(dev, dev->pins->active_state, + dev->pins->idle_state); + if (ret) { + dev_err(dev, "idle state groups do not match active state\n"); + dev->pins->idle_state = ERR_PTR(-EINVAL); + } + } #endif return 0; ^ permalink raw reply related [flat|nested] 40+ messages in thread
* Re: [PATCH 4/4] drivers: Add pinctrl handling for dynamic pin states 2013-07-16 9:05 ` [PATCH 4/4] drivers: Add pinctrl handling for dynamic pin states Tony Lindgren @ 2013-07-17 21:21 ` Stephen Warren 2013-07-18 7:50 ` Tony Lindgren 0 siblings, 1 reply; 40+ messages in thread From: Stephen Warren @ 2013-07-17 21:21 UTC (permalink / raw) To: Tony Lindgren Cc: linus.walleij, Greg Kroah-Hartman, linux-omap, linux-kernel, linux-arm-kernel On 07/16/2013 03:05 AM, Tony Lindgren wrote: > We want to have static pin states handled separately from > dynamic pin states, so let's add optional state_active. > > Then if state_active is defined, let's check and make sure > state_idle and state_sleep match state_active for the > pin groups to avoid checking them during runtime as the > active and idle pins may need to be toggled for many > devices every time we enter and exit idle. > + * Note that if active state is defined, sleep and idle states must > + * cover the same pin groups as active state. > */ > dev->pins->sleep_state = pinctrl_lookup_state(dev->pins->p, > PINCTRL_STATE_SLEEP); > - if (IS_ERR(dev->pins->sleep_state)) > + if (IS_ERR(dev->pins->sleep_state)) { > /* Not supplying this state is perfectly legal */ > dev_dbg(dev, "no sleep pinctrl state\n"); > + } else if (!IS_ERR(dev->pins->active_state)) { > + ret = pinctrl_check_dynamic(dev, dev->pins->active_state, > + dev->pins->sleep_state); Oh, I see you're trying to check that the set of pins in the active, sleep, and idle states are identical. But I think that pinctrl_check_dynamic() only checks that one state is a subset of the other, not that the two states are equal. Instead, I think you want to comparison coded in pinctrl_check_dynamic() to be: gen_group_list_of_pinctrl_state(s1, array1); gen_group_list_of_pinctrl_state(s2, array2); mismatch = memcmp(array1, array2, length); ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 4/4] drivers: Add pinctrl handling for dynamic pin states 2013-07-17 21:21 ` Stephen Warren @ 2013-07-18 7:50 ` Tony Lindgren 2013-07-18 13:48 ` Tony Lindgren 0 siblings, 1 reply; 40+ messages in thread From: Tony Lindgren @ 2013-07-18 7:50 UTC (permalink / raw) To: Stephen Warren Cc: linus.walleij, Greg Kroah-Hartman, linux-omap, linux-kernel, linux-arm-kernel * Stephen Warren <swarren@wwwdotorg.org> [130717 14:28]: > On 07/16/2013 03:05 AM, Tony Lindgren wrote: > > We want to have static pin states handled separately from > > dynamic pin states, so let's add optional state_active. > > > > Then if state_active is defined, let's check and make sure > > state_idle and state_sleep match state_active for the > > pin groups to avoid checking them during runtime as the > > active and idle pins may need to be toggled for many > > devices every time we enter and exit idle. > > > + * Note that if active state is defined, sleep and idle states must > > + * cover the same pin groups as active state. > > */ > > dev->pins->sleep_state = pinctrl_lookup_state(dev->pins->p, > > PINCTRL_STATE_SLEEP); > > - if (IS_ERR(dev->pins->sleep_state)) > > + if (IS_ERR(dev->pins->sleep_state)) { > > /* Not supplying this state is perfectly legal */ > > dev_dbg(dev, "no sleep pinctrl state\n"); > > + } else if (!IS_ERR(dev->pins->active_state)) { > > + ret = pinctrl_check_dynamic(dev, dev->pins->active_state, > > + dev->pins->sleep_state); > > Oh, I see you're trying to check that the set of pins in the active, > sleep, and idle states are identical. Right, that's to avoid any further checking during runtime for runtime PM. > But I think that pinctrl_check_dynamic() only checks that one state is a > subset of the other, not that the two states are equal. Instead, I think > you want to comparison coded in pinctrl_check_dynamic() to be: In pinctrl_check_dynamic() we check that the pins match between the states, and the number of found pins matches the first set. I'll take a look if we check the total pins between the two sets. > gen_group_list_of_pinctrl_state(s1, array1); > gen_group_list_of_pinctrl_state(s2, array2); > mismatch = memcmp(array1, array2, length); Well we could allocate and sort the pins, but the number of pins for runtime PM is typically very small for each pin consumer device. Typically you just need to toggle RX pin to GPIO mode for idle. And this check is only done during consumer driver probe time. So optimizing it for larger sets could be done at any point later on as needed. Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 4/4] drivers: Add pinctrl handling for dynamic pin states 2013-07-18 7:50 ` Tony Lindgren @ 2013-07-18 13:48 ` Tony Lindgren 0 siblings, 0 replies; 40+ messages in thread From: Tony Lindgren @ 2013-07-18 13:48 UTC (permalink / raw) To: Stephen Warren Cc: linus.walleij, Greg Kroah-Hartman, linux-omap, linux-kernel, linux-arm-kernel * Tony Lindgren <tony@atomide.com> [130718 00:57]: > * Stephen Warren <swarren@wwwdotorg.org> [130717 14:28]: > > > > Oh, I see you're trying to check that the set of pins in the active, > > sleep, and idle states are identical. > > Right, that's to avoid any further checking during runtime for runtime PM. > > > But I think that pinctrl_check_dynamic() only checks that one state is a > > subset of the other, not that the two states are equal. Instead, I think > > you want to comparison coded in pinctrl_check_dynamic() to be: > > In pinctrl_check_dynamic() we check that the pins match between the > states, and the number of found pins matches the first set. I'll > take a look if we check the total pins between the two sets. That that is a bit painful right now to check properly as we don't have any sorting, and we could use that elsewhere too for checks probably.. > > gen_group_list_of_pinctrl_state(s1, array1); > > gen_group_list_of_pinctrl_state(s2, array2); > > mismatch = memcmp(array1, array2, length); > > Well we could allocate and sort the pins, but the number of pins > for runtime PM is typically very small for each pin consumer device. > Typically you just need to toggle RX pin to GPIO mode for idle. And > this check is only done during consumer driver probe time. So > optimizing it for larger sets could be done at any point later on > as needed. ..so for now, let's just check the total number of pins for the sets like Felipe suggested. I think we're better off improving the pinctrl data first to make various checks easier. What you're suggesting with the mepcmp() can be done easily if we add something like device_get_pins() and have the pins sorted for the various states for a device at the device probe time. Regards, Tony ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 0/4] improved support for runtime muxing for pinctrl 2013-07-16 9:05 [PATCH 0/4] improved support for runtime muxing for pinctrl Tony Lindgren ` (3 preceding siblings ...) 2013-07-16 9:05 ` [PATCH 4/4] drivers: Add pinctrl handling for dynamic pin states Tony Lindgren @ 2013-07-16 9:14 ` Tony Lindgren 2013-07-17 11:49 ` Grygorii Strashko 5 siblings, 0 replies; 40+ messages in thread From: Tony Lindgren @ 2013-07-16 9:14 UTC (permalink / raw) To: linus.walleij; +Cc: linux-omap, linux-kernel, linux-arm-kernel * Tony Lindgren <tony@atomide.com> [130716 02:12]: > > As discussed earlier, the pinctrl support for changing some of the > consumer device pins during runtime needs some improvment. > > Here are the patches to do that, I'll also post a minimal sample > patch as a reply to this thread on how to do the muxing for > runtime PM. Here's a patch showing the suggested usage remuxing SDIO IRQ to GPIO mode for runtime PM. Note that this patch depends on three other patches for the hsmmc driver, I'll post that series separately. Regards, Tony From: Tony Lindgren <tony@atomide.com> Date: Mon, 15 Jul 2013 07:39:39 -0700 Subject: [PATCH] mmc: omap_hsmmc: Remux pins to support SDIO interrupt and PM runtime On some omaps we need to remux MMC pins for PM, and for some omaps we need to remux the SDIO IRQ pin. Based on an earlier patch by Andreas Fenkart <afenkart@gmail.com>. Cc: Andreas Fenkart <afenkart@gmail.com> Cc: Balaji T K <balajitk@ti.com> Cc: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Tony Lindgren <tony@atomide.com> --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -1869,7 +1869,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev) const struct of_device_id *match; dma_cap_mask_t mask; unsigned tx_req, rx_req; - struct pinctrl *pinctrl; match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev); if (match) { @@ -2114,21 +2113,19 @@ static int omap_hsmmc_probe(struct platform_device *pdev) omap_hsmmc_disable_irq(host); - pinctrl = devm_pinctrl_get_select_default(&pdev->dev); - if (IS_ERR(pinctrl)) - dev_warn(&pdev->dev, - "pins are not configured from the driver\n"); - /* - * For now, only support SDIO interrupt if we are doing - * muxing of dat1 when booted with DT. This is because the + * For now, only support SDIO interrupt if we are doing dynamic + * remuxing of dat1 when booted with DT. This is because the * supposedly the wake-up events for CTPL don't work from deeper * idle states. And we don't want to add new legacy mux platform * init code callbacks any longer as we are moving to DT based * booting anyways. */ if (match) { - if (!IS_ERR(pinctrl) && mmc_slot(host).sdio_irq) + struct device *dev = &pdev->dev; + + if (!pinctrl_pm_check_idle_state(dev) && + mmc_slot(host).sdio_irq) mmc->caps |= MMC_CAP_SDIO_IRQ; } @@ -2348,6 +2345,10 @@ static int omap_hsmmc_runtime_suspend(struct device *dev) OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); spin_unlock_irqrestore(&host->irq_lock, flags); + ret = pinctrl_pm_select_idle_state(dev); + if (ret < 0) + dev_err(dev, "Unable to select idle pinmux\n"); + if (mmc_slot(host).sdio_irq) enable_irq(mmc_slot(host).sdio_irq); } @@ -2371,6 +2372,10 @@ static int omap_hsmmc_runtime_resume(struct device *dev) if (mmc_slot(host).sdio_irq) disable_irq(mmc_slot(host).sdio_irq); + ret = pinctrl_pm_select_active_state(dev); + if (ret < 0) + dev_err(dev, "Unable to select active pinmux\n"); + spin_lock_irqsave(&host->irq_lock, flags); host->active_pinmux = true; ^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH 0/4] improved support for runtime muxing for pinctrl 2013-07-16 9:05 [PATCH 0/4] improved support for runtime muxing for pinctrl Tony Lindgren ` (4 preceding siblings ...) 2013-07-16 9:14 ` [PATCH 0/4] improved support for runtime muxing for pinctrl Tony Lindgren @ 2013-07-17 11:49 ` Grygorii Strashko 5 siblings, 0 replies; 40+ messages in thread From: Grygorii Strashko @ 2013-07-17 11:49 UTC (permalink / raw) To: Tony Lindgren; +Cc: linus.walleij, linux-omap, linux-kernel, linux-arm-kernel Hi Tony, On 07/16/2013 12:05 PM, Tony Lindgren wrote: > Hi all, > > As discussed earlier, the pinctrl support for changing some of the > consumer device pins during runtime needs some improvment. > > Here are the patches to do that, I'll also post a minimal sample > patch as a reply to this thread on how to do the muxing for > runtime PM. I've posted my patch and tested this patch series. Seems everything is ok (except patch "pinctrl: Remove duplicate code in pinctrl_pm_select_state functions"). See http://www.spinics.net/lists/arm-kernel/msg259180.html So, Tested-By: Grygorii Strashko <grygorii.strashko@ti.com> > > Regards, > > Tony > > --- > > Tony Lindgren (4): > pinctrl: Remove duplicate code in pinctrl_pm_select_state functions > pinctrl: Allow pinctrl to have multiple active states > pinctrl: Add support for additional dynamic states > drivers: Add pinctrl handling for dynamic pin states > > > drivers/base/pinctrl.c | 39 +++++ > drivers/pinctrl/core.c | 250 ++++++++++++++++++++++++++++----- > drivers/pinctrl/core.h | 10 + > include/linux/pinctrl/consumer.h | 46 ++++++ > include/linux/pinctrl/devinfo.h | 4 + > include/linux/pinctrl/pinctrl-state.h | 15 ++ > 6 files changed, 321 insertions(+), 43 deletions(-) > Regards, -grygorii ^ permalink raw reply [flat|nested] 40+ messages in thread
* [PATCHv2 0/4] improved support for runtime muxing for pinctrl @ 2013-07-18 15:15 Tony Lindgren 2013-07-18 15:15 ` [PATCH 3/4] pinctrl: Add support for additional dynamic states Tony Lindgren 0 siblings, 1 reply; 40+ messages in thread From: Tony Lindgren @ 2013-07-18 15:15 UTC (permalink / raw) To: linus.walleij; +Cc: linux-omap, linux-kernel, linux-arm-kernel Hi all, Here's this series again with hopefully all the comments addressed. As discussed earlier, the pinctrl support for changing some of the consumer device pins during runtime needs some improvment. Regards, Tony --- Tony Lindgren (4): pinctrl: Remove duplicate code in pinctrl_pm_select_state functions pinctrl: Allow pinctrl to have multiple active states pinctrl: Add support for additional dynamic states drivers: Add pinctrl handling for dynamic pin states Documentation/pinctrl.txt | 77 ++++++++- drivers/base/pinctrl.c | 39 ++++ drivers/pinctrl/core.c | 291 +++++++++++++++++++++++++++------ drivers/pinctrl/core.h | 10 + include/linux/pinctrl/consumer.h | 46 +++++ include/linux/pinctrl/devinfo.h | 4 include/linux/pinctrl/pinctrl-state.h | 15 +- 7 files changed, 420 insertions(+), 62 deletions(-) -- Signature ^ permalink raw reply [flat|nested] 40+ messages in thread
* [PATCH 3/4] pinctrl: Add support for additional dynamic states 2013-07-18 15:15 [PATCHv2 " Tony Lindgren @ 2013-07-18 15:15 ` Tony Lindgren 0 siblings, 0 replies; 40+ messages in thread From: Tony Lindgren @ 2013-07-18 15:15 UTC (permalink / raw) To: linus.walleij Cc: Grygorii Strashko, Stephen Warren, linux-kernel, Felipe Balbi, linux-omap, linux-arm-kernel To toggle dynamic states, let's add the optional active state in addition to the static default state. Then if the optional active state is defined, we can require that idle and sleep states cover the same pingroups as the active state. Then let's add pinctrl_check_dynamic() and pinctrl_select_dynamic() to use instead of pinctrl_select() to avoid breaking existing users. With pinctrl_check_dynamic() we can check that idle and sleep states match the active state for pingroups during init, and don't need to do it during runtime. Then with the states pre-validated, pinctrl_select_dynamic() can just toggle between the dynamic states without extra checks. Note that pinctr_select_state() still has valid use cases, such as changing states when the pins can be shared between two drivers and don't necessarily cover the same pingroups. For dynamic runtime toggling of pin states, we should eventually always use just pinctrl_select_dynamic(). Cc: Felipe Balbi <balbi@ti.com> Cc: Grygorii Strashko <grygorii.strashko@ti.com> Cc: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Tony Lindgren <tony@atomide.com> --- Documentation/pinctrl.txt | 77 ++++++++++- drivers/pinctrl/core.c | 226 ++++++++++++++++++++++++++++++--- include/linux/pinctrl/consumer.h | 46 +++++++ include/linux/pinctrl/devinfo.h | 4 + include/linux/pinctrl/pinctrl-state.h | 15 ++ 5 files changed, 342 insertions(+), 26 deletions(-) diff --git a/Documentation/pinctrl.txt b/Documentation/pinctrl.txt index 052e13a..0477ec5 100644 --- a/Documentation/pinctrl.txt +++ b/Documentation/pinctrl.txt @@ -1283,12 +1283,77 @@ This gives the exact same result as the above construction. Runtime pinmuxing ================= -It is possible to mux a certain function in and out at runtime, say to move -an SPI port from one set of pins to another set of pins. Say for example for -spi0 in the example above, we expose two different groups of pins for the same -function, but with different named in the mapping as described under -"Advanced mapping" above. So that for an SPI device, we have two states named -"pos-A" and "pos-B". +Typically runtime pinmuxing is done for runtime PM to mux a device RX pin +to GPIO for wake-up events. And In some cases a shared RX/TX pin may need to +be toggled. Sometimes pins can be also shared between two device drivers. + +In most cases runtime pinmuxing only is needed for some pins on a device, and +most pins can be static. To avoid continuously having to check for all the +pins of a device, pinctrl framework supports grouping device pin states to +static and dynamic states. + +Most devices only need to use the static default state. If a devices has a +need for runtime pinmuxing, the device must define the static default state, +and then the optional dynamic states using the following rules: + +1. The default dynamic states are in addition to the static default state. + +2. The default dynamic states are active, sleep and idle, or active and idle. + +3. At least active and idle, or active and sleep states must be defined. + +4. Out of the dynamic pin states, only one of the active, sleep or idle states + can be active at a time. + +5. The dynamic pin states must all toggle the same pins to avoid unnecessary + checks during runtime. + +6. The pinctrl consumer driver must use pinctrl_select_dynamic() instead of + pinctrl_select_state() to toggle between the dynamic states. + +For example, to mux a serial driver RX pin to GPIO for runtime PM wake-up +events, something like the following can be done. Most of the work is done +by the pinctrl framework as long as the default, active and idle states are +properly defined. + +#include <linux/pinctrl/consumer.h> + +serial_foo_probe() +{ + ... + if (!pinctrl_pm_is_idle_state_error()) + /* Set driver specific flags for runtime PM */ + ... +} + +static int serial_foo_runtime_suspend(struct device *dev) +{ + ... + res = pinctrl_pm_select_idle_state(dev); + if (ret < 0) + return ret; + ... +} + +static int serial_foo_runtime_resume(struct device *dev) +{ + ... + res = pinctrl_pm_select_active_state(dev); + if (ret < 0) + return ret; + ... +} + +Currently only runtime muxing for runtime PM has been optimized as that can +happen at high rate every time when idling and unidling devices. For less +latency critical runtime remuxing it is possible to use pinctrl_select_state() +as described below. + +For example, it is possible to move an SPI port from one set of pins to another +set of pins. Say for example for spi0 in the example above, we expose two +different groups of pins for the same function, but with different named in +the mapping as described under "Advanced mapping" above. So that for an SPI +device, we have two states named "pos-A" and "pos-B". This snippet first muxes the function in the pins defined by group A, enables it, disables and releases it, and muxes it in on the pins defined by group B: diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index c9b709b..af399cc 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -885,8 +885,13 @@ static void pinctrl_free(struct pinctrl *p, bool inlist) mutex_lock(&pinctrl_list_mutex); list_for_each_entry_safe(state, n1, &p->states, node) { list_for_each_entry_safe(setting, n2, &state->settings, node) { - pinctrl_free_setting(state == p->state[PINCTRL_STATIC], - setting); + bool disable_setting = false; + + if ((state == p->state[PINCTRL_STATIC]) || + (state == p->state[PINCTRL_DYNAMIC])) + disable_setting = true; + + pinctrl_free_setting(disable_setting, setting); list_del(&setting->node); kfree(setting); } @@ -949,6 +954,25 @@ struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, EXPORT_SYMBOL_GPL(pinctrl_lookup_state); /** + * pinctrl_apply_setting() - apply a setting + * @setting: pinctrl setting to apply + */ +static int pinctrl_apply_setting(struct pinctrl_setting *setting) +{ + switch (setting->type) { + case PIN_MAP_TYPE_MUX_GROUP: + return pinmux_enable_setting(setting); + case PIN_MAP_TYPE_CONFIGS_PIN: + case PIN_MAP_TYPE_CONFIGS_GROUP: + return pinconf_apply_setting(setting); + default: + break; + } + + return -EINVAL; +} + +/** * pinctrl_select_state() - select/activate/program a pinctrl state to HW * @p: the pinctrl handle for the device that requests configuration * @state: the state handle to select/activate/program @@ -994,19 +1018,7 @@ int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state) /* Apply all the settings for the new state */ list_for_each_entry(setting, &state->settings, node) { - switch (setting->type) { - case PIN_MAP_TYPE_MUX_GROUP: - ret = pinmux_enable_setting(setting); - break; - case PIN_MAP_TYPE_CONFIGS_PIN: - case PIN_MAP_TYPE_CONFIGS_GROUP: - ret = pinconf_apply_setting(setting); - break; - default: - ret = -EINVAL; - break; - } - + ret = pinctrl_apply_setting(setting); if (ret < 0) { goto unapply_new_state; } @@ -1041,6 +1053,122 @@ unapply_new_state: } EXPORT_SYMBOL_GPL(pinctrl_select_state); +/** + * pinctrl_setting_get_group_pins() - get group pins for a pinctrl setting + * @s: pinctrl setting pointer + * @pins: pins + * @num_pins: number of pins + */ +static int pinctrl_setting_get_group_pins(struct pinctrl_setting *s, + const unsigned **pins, unsigned *num_pins) +{ + struct pinctrl_dev *pctldev; + const struct pinctrl_ops *pctlops; + + if (s->type != PIN_MAP_TYPE_MUX_GROUP) + return -EINVAL; + + pctldev = s->pctldev; + pctlops = pctldev->desc->pctlops; + + return pctlops->get_group_pins(pctldev, s->data.mux.group, + pins, num_pins); +} + +/** + * pinctrl_state_get_pin_count() - get a pin count for a state + * @st: pinctrl state pointer + */ +static int pinctrl_state_get_pin_count(struct pinctrl_state *st) +{ + struct pinctrl_setting *s; + int found = 0; + + list_for_each_entry(s, &st->settings, node) { + const unsigned *pins; + unsigned num_pins; + int res; + + res = pinctrl_setting_get_group_pins(s, &pins, &num_pins); + if (res) + continue; + + found += num_pins; + } + + return found; +} + +/** + * pinctrl_check_dynamic() - compare two states for the pins + * @dev: pinctrl consumer device pointer + * @st1: state handle + * @st2: state handle + * + * This function checks that the group pins match between the two + * states to avoid runtime checking. Note that currently the checking + * is very minimal, but can be enhanced as needed. Even this minimal + * check should be enough to avoid trying to use the default pins state + * with pinctrl_select_dynamic(). + * + * Call this during pinctrl consumer driver probe time to check + * dynamic pin states used by the device for runtime PM etc. + + * REVISIT: We can improve this further by adding device_get_pins() + * and adding a sorted state arrays for pins at device probe time. + * The comparing two states can be done just by comparing the two + * arrays. + */ +int pinctrl_check_dynamic(struct device *dev, struct pinctrl_state *st1, + struct pinctrl_state *st2) +{ + int num_pins1, num_pins2; + + num_pins1 = pinctrl_state_get_pin_count(st1); + num_pins2 = pinctrl_state_get_pin_count(st2); + + if (num_pins1 != num_pins2) { + dev_err(dev, "device pins do not match for PM states\n"); + return -EINVAL; + } + + return 0; +} +EXPORT_SYMBOL_GPL(pinctrl_check_dynamic); + +/** + * pinctrl_select_dynamic() - fast path for toggling pre-validated sets of pins + * @p: the pinctrl handle for the device that requests configuration + * @state: the state handle to select/activate/program + * + * Note that as we've already checked that the PINCTRL_DYNAMIC pins always + * cover the same sets for active/idle, or rx/tx, there's no need to call + * pinux_disable_settings() on these pins. Calling it could also cause + * issues for the connected peripheral as it potentially could change the + * values of data lines for example. + */ +int pinctrl_select_dynamic(struct pinctrl *p, struct pinctrl_state *state) +{ + struct pinctrl_setting *setting; + int ret; + + if (p->state[PINCTRL_DYNAMIC] == state) + return 0; + + list_for_each_entry(setting, &state->settings, node) { + ret = pinctrl_apply_setting(setting); + if (ret < 0) { + dev_err(p->dev, "Error applying dynamic settings\n"); + return ret; + } + } + + p->state[PINCTRL_DYNAMIC] = state; + + return 0; +} +EXPORT_SYMBOL_GPL(pinctrl_select_dynamic); + static void devm_pinctrl_release(struct device *dev, void *res) { pinctrl_put(*(struct pinctrl **)res); @@ -1240,7 +1368,13 @@ static int pinctrl_pm_select_state(struct device *dev, if (IS_ERR(state)) return 0; /* No such state */ - ret = pinctrl_select_state(pins->p, state); + + /* Configured for dynamic muxing? */ + if (!IS_ERR(dev->pins->active_state)) + ret = pinctrl_select_dynamic(pins->p, state); + else + ret = pinctrl_select_state(pins->p, state); + if (ret) dev_err(dev, "failed to activate pinctrl state %s\n", state->name); @@ -1261,6 +1395,19 @@ int pinctrl_pm_select_default_state(struct device *dev) EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state); /** + * pinctrl_pm_select_active_state() - select active pinctrl state for PM + * @dev: device to select default state for + */ +int pinctrl_pm_select_active_state(struct device *dev) +{ + if (!dev->pins) + return 0; + + return pinctrl_pm_select_state(dev, dev->pins->active_state); +} +EXPORT_SYMBOL_GPL(pinctrl_pm_select_active_state); + +/** * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM * @dev: device to select sleep state for */ @@ -1285,6 +1432,47 @@ int pinctrl_pm_select_idle_state(struct device *dev) return pinctrl_pm_select_state(dev, dev->pins->idle_state); } EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state); + +static int pinctrl_pm_is_state_error(struct device *dev, + struct pinctrl_state *state) +{ + if (!dev) + return -EINVAL; + + return IS_ERR(state); +} + +/** + * pinctrl_pm_is_sleep_state_error() - check if sleep state is configured + * @dev: consumer device + * + * Call this from consumer driver to check if the sleep state + * has been properly configured on the device. + */ +int pinctrl_pm_is_sleep_state_error(struct device *dev) +{ + if (!dev->pins) + return 0; + + return pinctrl_pm_is_state_error(dev, dev->pins->sleep_state); +} +EXPORT_SYMBOL_GPL(pinctrl_pm_is_sleep_state_error); + +/** + * pinctrl_pm_is_idle_state_error() - check if idle state is configured + * @dev: consumer device + * + * Call this from consumer driver to check if the idle state + * has been properly configured on the device. + */ +int pinctrl_pm_is_idle_state_error(struct device *dev) +{ + if (!dev->pins) + return 0; + + return pinctrl_pm_is_state_error(dev, dev->pins->idle_state); +} +EXPORT_SYMBOL_GPL(pinctrl_pm_is_idle_state_error); #endif #ifdef CONFIG_DEBUG_FS @@ -1491,10 +1679,12 @@ static int pinctrl_show(struct seq_file *s, void *what) mutex_lock(&pinctrl_list_mutex); list_for_each_entry(p, &pinctrl_list, node) { - seq_printf(s, "device: %s current state: %s\n", + seq_printf(s, "device: %s current states: %s %s\n", dev_name(p->dev), p->state[PINCTRL_STATIC] ? - p->state[PINCTRL_STATIC]->name : "none"); + p->state[PINCTRL_STATIC]->name : "none", + p->state[PINCTRL_DYNAMIC] ? + p->state[PINCTRL_DYNAMIC]->name : "none"); list_for_each_entry(state, &p->states, node) { seq_printf(s, " state: %s\n", state->name); diff --git a/include/linux/pinctrl/consumer.h b/include/linux/pinctrl/consumer.h index 18eccef..333885b 100644 --- a/include/linux/pinctrl/consumer.h +++ b/include/linux/pinctrl/consumer.h @@ -36,19 +36,29 @@ extern struct pinctrl_state * __must_check pinctrl_lookup_state( struct pinctrl *p, const char *name); extern int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *s); +extern int pinctrl_check_dynamic(struct device *dev, struct pinctrl_state *s1, + struct pinctrl_state *s2); +extern int pinctrl_select_dynamic(struct pinctrl *p, struct pinctrl_state *s); extern struct pinctrl * __must_check devm_pinctrl_get(struct device *dev); extern void devm_pinctrl_put(struct pinctrl *p); #ifdef CONFIG_PM extern int pinctrl_pm_select_default_state(struct device *dev); +extern int pinctrl_pm_select_active_state(struct device *dev); extern int pinctrl_pm_select_sleep_state(struct device *dev); extern int pinctrl_pm_select_idle_state(struct device *dev); +extern int pinctrl_pm_is_sleep_state_error(struct device *dev); +extern int pinctrl_pm_is_idle_state_error(struct device *dev); #else static inline int pinctrl_pm_select_default_state(struct device *dev) { return 0; } +static inline int pinctrl_pm_select_active_state(struct device *dev) +{ + return 0; +} static inline int pinctrl_pm_select_sleep_state(struct device *dev) { return 0; @@ -57,6 +67,14 @@ static inline int pinctrl_pm_select_idle_state(struct device *dev) { return 0; } +static inline int pinctrl_pm_is_sleep_state_error(struct device *dev) +{ + return -ENODEV; +} +static inline int pinctrl_pm_is_idle_state_error(struct device *dev) +{ + return -ENODEV; +} #endif #else /* !CONFIG_PINCTRL */ @@ -102,6 +120,19 @@ static inline int pinctrl_select_state(struct pinctrl *p, return 0; } +static inline int pinctrl_check_dynamic(struct device *dev, + struct pinctrl_state *s1, + struct pinctrl_state *s2) +{ + return 0; +} + +static inline int pinctrl_select_dynamic(struct pinctrl *p, + struct pinctrl_state *s) +{ + return 0; +} + static inline struct pinctrl * __must_check devm_pinctrl_get(struct device *dev) { return NULL; @@ -116,6 +147,11 @@ static inline int pinctrl_pm_select_default_state(struct device *dev) return 0; } +static inline int pinctrl_pm_select_active_state(struct device *dev) +{ + return 0; +} + static inline int pinctrl_pm_select_sleep_state(struct device *dev) { return 0; @@ -126,6 +162,16 @@ static inline int pinctrl_pm_select_idle_state(struct device *dev) return 0; } +static inline int pinctrl_pm_is_sleep_state_error(struct device *dev) +{ + return -ENODEV; +} + +static inline int pinctrl_pm_is_idle_state_error(struct device *dev) +{ + return -ENODEV; +} + #endif /* CONFIG_PINCTRL */ static inline struct pinctrl * __must_check pinctrl_get_select( diff --git a/include/linux/pinctrl/devinfo.h b/include/linux/pinctrl/devinfo.h index 281cb91..2857a7b 100644 --- a/include/linux/pinctrl/devinfo.h +++ b/include/linux/pinctrl/devinfo.h @@ -24,10 +24,14 @@ * struct dev_pin_info - pin state container for devices * @p: pinctrl handle for the containing device * @default_state: the default state for the handle, if found + * @active_state: the default state for the handle, if found + * @sleep_state: the default state for the handle, if found + * @idle_state: the default state for the handle, if found */ struct dev_pin_info { struct pinctrl *p; struct pinctrl_state *default_state; + struct pinctrl_state *active_state; #ifdef CONFIG_PM struct pinctrl_state *sleep_state; struct pinctrl_state *idle_state; diff --git a/include/linux/pinctrl/pinctrl-state.h b/include/linux/pinctrl/pinctrl-state.h index b5919f8..c136e82 100644 --- a/include/linux/pinctrl/pinctrl-state.h +++ b/include/linux/pinctrl/pinctrl-state.h @@ -9,16 +9,27 @@ * hogs to configure muxing and pins at boot, and also as a state * to go into when returning from sleep and idle in * .pm_runtime_resume() or ordinary .resume() for example. + * @PINCTRL_STATE_ACTIVE: optional state of dynamic pins in addition to + * PINCTRL_STATE_DEFAULT that are needed during runtime. * @PINCTRL_STATE_IDLE: the state the pinctrl handle shall be put into * when the pins are idle. This is a state where the system is relaxed * but not fully sleeping - some power may be on but clocks gated for * example. Could typically be set from a pm_runtime_suspend() or - * pm_runtime_idle() operation. + * pm_runtime_idle() operation. If PINCTRL_STATE_ACTIVE pins are + * defined, PINCTRL_STATE_IDLE pin groups must cover the same pin + * groups as PINCTRL_STATE_ACTIVE and selecting PINCTRL_STATE_IDLE + * must be done using pinctrl_select_state_dynamic() instead of + * pinctrl_select_state(). * @PINCTRL_STATE_SLEEP: the state the pinctrl handle shall be put into * when the pins are sleeping. This is a state where the system is in * its lowest sleep state. Could typically be set from an - * ordinary .suspend() function. + * ordinary .suspend() function. If PINCTRL_STATE_ACTIVE pins are + * defined, PINCTRL_STATE_SLEEP pin groups must cover the same pin + * groups as PINCTRL_STATE_ACTIVE and selecting PINCTRL_STATE_SLEEP + * must be done using pinctrl_select_state_dynamic() instead of + * pinctrl_select_state(). */ #define PINCTRL_STATE_DEFAULT "default" +#define PINCTRL_STATE_ACTIVE "active" #define PINCTRL_STATE_IDLE "idle" #define PINCTRL_STATE_SLEEP "sleep" ^ permalink raw reply related [flat|nested] 40+ messages in thread
end of thread, other threads:[~2013-08-14 16:41 UTC | newest] Thread overview: 40+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2013-07-16 9:05 [PATCH 0/4] improved support for runtime muxing for pinctrl Tony Lindgren 2013-07-16 9:05 ` [PATCH 1/4] pinctrl: Remove duplicate code in pinctrl_pm_select_state functions Tony Lindgren 2013-07-16 13:15 ` Grygorii Strashko 2013-07-16 13:41 ` Tony Lindgren 2013-07-16 14:25 ` Grygorii Strashko 2013-07-17 6:31 ` Tony Lindgren 2013-07-16 9:05 ` [PATCH 2/4] pinctrl: Allow pinctrl to have multiple active states Tony Lindgren 2013-07-17 20:55 ` Stephen Warren 2013-07-16 9:05 ` [PATCH 3/4] pinctrl: Add support for additional dynamic states Tony Lindgren 2013-07-16 9:35 ` Felipe Balbi 2013-07-16 12:06 ` Tony Lindgren 2013-07-17 21:14 ` Stephen Warren 2013-07-18 7:25 ` Tony Lindgren 2013-07-18 10:53 ` Tony Lindgren 2013-07-18 19:21 ` Stephen Warren 2013-07-19 7:29 ` Tony Lindgren 2013-07-19 18:52 ` Stephen Warren 2013-07-29 9:05 ` Tony Lindgren 2013-07-29 22:01 ` Stephen Warren 2013-08-14 16:41 ` Linus Walleij 2013-07-17 21:23 ` Stephen Warren 2013-07-18 7:36 ` Tony Lindgren 2013-07-18 19:26 ` Stephen Warren 2013-07-19 7:39 ` Tony Lindgren 2013-07-19 10:29 ` Grygorii Strashko 2013-07-19 19:03 ` Stephen Warren 2013-07-22 23:15 ` Linus Walleij 2013-07-29 9:08 ` Tony Lindgren 2013-07-19 18:58 ` Stephen Warren 2013-07-29 9:21 ` Tony Lindgren 2013-07-29 22:08 ` Stephen Warren 2013-07-22 23:07 ` Linus Walleij 2013-07-29 9:31 ` Tony Lindgren 2013-07-16 9:05 ` [PATCH 4/4] drivers: Add pinctrl handling for dynamic pin states Tony Lindgren 2013-07-17 21:21 ` Stephen Warren 2013-07-18 7:50 ` Tony Lindgren 2013-07-18 13:48 ` Tony Lindgren 2013-07-16 9:14 ` [PATCH 0/4] improved support for runtime muxing for pinctrl Tony Lindgren 2013-07-17 11:49 ` Grygorii Strashko 2013-07-18 15:15 [PATCHv2 " Tony Lindgren 2013-07-18 15:15 ` [PATCH 3/4] pinctrl: Add support for additional dynamic states Tony Lindgren
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