Kevin,
>-----Original Message----- >From: linux-usb-ow...@vger.kernel.org >[mailto:linux-usb-ow...@vger.kernel.org] On Behalf Of Kalliguddi, Hema >Sent: Thursday, September 23, 2010 1:29 PM >To: Balbi, Felipe >Cc: linux-omap@vger.kernel.org; linux-...@vger.kernel.org; >Mankad, Maulik Ojas; Tony Lindgren; Kevin Hilman; Cousson, >Benoit; Paul Walmsley >Subject: RE: [PATCH 9/9 v3] usb : musb: Offmode fix for idle path > > Hi, > >>-----Original Message----- >>From: Balbi, Felipe >>Sent: Thursday, September 23, 2010 12:19 PM >>To: Kalliguddi, Hema >>Cc: linux-omap@vger.kernel.org; linux-...@vger.kernel.org; >>Mankad, Maulik Ojas; Balbi, Felipe; Tony Lindgren; Kevin >>Hilman; Cousson, Benoit; Paul Walmsley >>Subject: Re: [PATCH 9/9 v3] usb : musb: Offmode fix for idle path >> >>Hi, >> >>On Wed, Sep 22, 2010 at 07:30:46PM -0500, Kalliguddi, Hema wrote: >>>With OMAP core-off support musb was not functional as context >>was getting >>>lost after wakeup from core-off. And also musb was blocking >>the core-off >>>after loading the gadget driver even with no cable connected >>sometimes. >>> >>>Added the idle and wakeup APIs in the platform layer which will >>>be called in the idle and wakeup path. >>> >>>Used the pm_runtime_put_sysc API to configure the >> >>pm_runtime_put_sync(), typo. >> >>>musb to force idle/standby modes, saving the context and >>disable the clk in >>>while idling if there is no activity on the usb bus. >> >>this part is a bit fuzzy, care to re-phrase ? >> >Ok. I will re-phrase it. > >>>Used the pm_runtime_get_sync API to configure the musb to >>>no idle/standby modes, enable the clock and restore the context >>>after wakeup when there is no activity on the usb bus. >>> >>>Signed-off-by: Hema HK <hem...@ti.com> >>>Signed-off-by: Maulik Mankad <x0082...@ti.com> >>>Cc: Felipe Balbi <ba...@ti.com> >>>Cc: Tony Lindgren <t...@atomide.com> >>>Cc: Kevin Hilman <khil...@deeprootsystems.com> >>>Cc: Cousson, Benoit <b-cous...@ti.com> >>>Cc: Paul Walmsley <p...@pwsan.com> >>> >>>--- >>> arch/arm/mach-omap2/cpuidle34xx.c | 1 >>> arch/arm/mach-omap2/pm34xx.c | 3 >>> arch/arm/mach-omap2/usb-musb.c | 107 >>++++++++++++++++++++++++++++++++++ >>> arch/arm/plat-omap/include/plat/usb.h | 2 >>> drivers/usb/musb/musb_core.c | 15 ++++ >>> drivers/usb/musb/omap2430.c | 14 ++++ >>> include/linux/usb/musb.h | 9 ++ >>> 7 files changed, 149 insertions(+), 2 deletions(-) >>> >>>Index: linux-omap-pm/arch/arm/mach-omap2/cpuidle34xx.c >>>=================================================================== >>>--- linux-omap-pm.orig/arch/arm/mach-omap2/cpuidle34xx.c >>>+++ linux-omap-pm/arch/arm/mach-omap2/cpuidle34xx.c >>>@@ -31,6 +31,7 @@ >>> #include <plat/clockdomain.h> >>> #include <plat/control.h> >>> #include <plat/serial.h> >>>+#include <plat/usb.h> >>> >>> #include "pm.h" >>> >>>Index: linux-omap-pm/arch/arm/mach-omap2/pm34xx.c >>>=================================================================== >>>--- linux-omap-pm.orig/arch/arm/mach-omap2/pm34xx.c >>>+++ linux-omap-pm/arch/arm/mach-omap2/pm34xx.c >>>@@ -38,6 +38,7 @@ >>> #include <plat/prcm.h> >>> #include <plat/gpmc.h> >>> #include <plat/dma.h> >>>+#include <plat/usb.h> >>> >>> #include <asm/tlbflush.h> >>> >>>@@ -324,11 +325,13 @@ static void restore_table_entry(void) >>> void omap3_device_idle(void) >>> { >>> omap2_gpio_prepare_for_idle(); >>>+ musb_prepare_for_idle(); >>> } >>> >>> void omap3_device_resume(void) >>> { >>> omap2_gpio_resume_after_idle(); >>>+ musb_wakeup_from_idle(); >>> } >>> >>> void omap_sram_idle(void) >>>Index: linux-omap-pm/arch/arm/mach-omap2/usb-musb.c >>>=================================================================== >>>--- linux-omap-pm.orig/arch/arm/mach-omap2/usb-musb.c >>>+++ linux-omap-pm/arch/arm/mach-omap2/usb-musb.c >>>@@ -25,16 +25,21 @@ >>> #include <linux/io.h> >>> >>> #include <linux/usb/musb.h> >>>+#include <linux/pm_runtime.h> >>> >>> #include <mach/hardware.h> >>> #include <mach/irqs.h> >>> #include <plat/usb.h> >>> #include <plat/omap_device.h> >>>+#include <plat/powerdomain.h> >>> >>> #ifdef CONFIG_USB_MUSB_SOC >>> static const char name[] = "musb_hdrc"; >>> #define MAX_OMAP_MUSB_HWMOD_NAME_LEN 16 >>> >>>+struct omap_hwmod *oh_p; >>>+static struct powerdomain *core_pwrdm; >>>+ >>> static struct musb_hdrc_config musb_config = { >>> .multipoint = 1, >>> .dyn_fifo = 1, >>>@@ -58,6 +63,10 @@ static struct musb_hdrc_platform_data mu >>> * "mode", and should be passed to usb_musb_init(). >>> */ >>> .power = 50, /* up to 100 mA */ >>>+ >>>+ /* OMAP supports offmode */ >>>+ .save_context = 1, >>>+ .restore_context = 1, >>> }; >>> >>> static u64 musb_dmamask = DMA_BIT_MASK(32); >>>@@ -80,6 +89,7 @@ void __init usb_musb_init(struct omap_mu >>> const char *oh_name = "usb_otg_hs"; >>> struct musb_hdrc_platform_data *pdata; >>> >>>+ core_pwrdm = pwrdm_lookup("per_pwrdm"); >> >>per or core ??? >> >Oh! It should be core. Now I understand why save/restore >counts were not matching with >Core-off counts. >Thanks for pointing this out. If I call pm_runtime_put_sync and pm_runtime_get_sync based on the core domain state then the USB connect/reset interrupt is not triggered once the core hits off. In omap3_enter_idle_bm() there is no core next state being programmed to PRCM register, but the drivers functions which are called from omap3_device_idle are suppose to read the core next state from the PRCM register. I am missing something here? If I use the per_pwrdm states to save the context and restore everything works fine. > >>>@@ -97,6 +107,7 @@ void __init usb_musb_init(struct omap_mu >>> musb_plat.extvbus = board_data->extvbus; >>> >>> pdata = &musb_plat; >>>+ oh_p = oh; >>> >>> od = omap_device_build(name, bus_id, oh, pdata, >>> sizeof(struct musb_hdrc_platform_data), >>>@@ -115,8 +126,101 @@ void __init usb_musb_init(struct omap_mu >>> put_device(dev); >>> } >>> >>>+void musb_prepare_for_idle() >>>+{ >>>+ int core_next_state; >>>+ struct omap_hwmod *oh = oh_p; >>>+ struct omap_device *od; >>>+ struct platform_device *pdev; >>>+ struct musb_hdrc_platform_data *pdata; >>>+ struct device *dev; >>>+ >>>+ if (!core_pwrdm) >>>+ return; >>>+ >>>+ core_next_state = pwrdm_read_next_pwrst(core_pwrdm); >>>+ if (core_next_state >= PWRDM_POWER_INACTIVE) >>>+ return; >>>+ if (!oh) >>>+ return; >>>+ >>>+ od = oh->od; >>>+ pdev = &od->pdev; >>>+ >>>+ if (!pdev) >>>+ return; >>>+ dev = &pdev->dev; >>>+ >>>+ if (dev->driver) { >>>+ pdata = dev->platform_data; >>>+ >>>+ if (pdata->is_usb_active) >> >>indentation is wrong. And you can save some of it: > >Maulik is pointed this out and I will fixing it. >> >> if (!dev->driver) >> return; >> >> pdata = dev->platform_data; >> >> if (!pdata->is_usb_active) >> return; >> >> if (!pdata->is_usb_active(dev)) { >> switch (core_next_state) { >> case PWRDM_POWER_OFF: >> pdata->save_context = 1; >> pm_runtime_put_sync(dev); >> break; >> case PWRDM_POWER_RET: >> pdata->save_context = 0; >> pm_runtime_put_sync(dev); >> break; >> default: >> pr_debug("what ??\n"); >> } >> } >> >>>Index: linux-omap-pm/drivers/usb/musb/musb_core.c >>>=================================================================== >>>--- linux-omap-pm.orig/drivers/usb/musb/musb_core.c >>>+++ linux-omap-pm/drivers/usb/musb/musb_core.c >>>@@ -2410,6 +2410,7 @@ static int musb_suspend(struct device *d >>> struct platform_device *pdev = to_platform_device(dev); >>> unsigned long flags; >>> struct musb *musb = dev_to_musb(&pdev->dev); >>>+ struct musb_hdrc_platform_data *plat = dev->platform_data; >>> >>> if (!musb->clock) >>> return 0; >>>@@ -2425,6 +2426,9 @@ static int musb_suspend(struct device *d >>> * they will even be wakeup-enabled. >>> */ >>> } >>>+ >>>+ if (plat->save_context) >>>+ plat->save_context = 1; >> >>what ?? >> >>if plat->save_context is 1, then set it to 1 ??? >> >This is mistake. I messed it up. I had another flag >for offmode support, which I removed later. >i will correct this. > >>>@@ -2443,10 +2447,13 @@ static int musb_resume_noirq(struct devi >>> { >>> struct platform_device *pdev = to_platform_device(dev); >>> struct musb *musb = dev_to_musb(&pdev->dev); >> >>just now I notice these, hah, funny :-p pdev isn't even >>needed. Has been >>there for quite a while I believe. >> >>Commit 48fea965 should have changed that line, but that's ok, we will >>clean it later. >> >Yehh :-) >If it is OK, I can clean it up with this patch only. > >>>+ struct musb_hdrc_platform_data *plat = dev->platform_data; >>> >>> if (!musb->clock) >>> return 0; >>> >>>+ if (plat->restore_context) >>>+ plat->restore_context = 1; >> >>also here?? there's something wrong. >> >Yes... > >>>@@ -2468,16 +2475,20 @@ static int musb_resume_noirq(struct devi >>> static int musb_runtime_suspend(struct device *dev) >>> { >>> struct musb *musb = dev_to_musb(dev); >>>+ struct musb_hdrc_platform_data *plat = dev->platform_data; >>> >>>- musb_save_context(musb); >>>+ if (plat->save_context) >>>+ musb_save_context(musb); >> >>this looks better. >> >>>@@ -126,6 +128,17 @@ struct musb_hdrc_platform_data { >>> >>> /* Architecture specific board data */ >>> void *board_data; >>>+ >>>+ /* check usb device active state*/ >>>+ int (*is_usb_active)(struct device *dev); >> >>where is it used ?? >> >This you got it already. >>-- >>balbi >>-- >To unsubscribe from this list: send the line "unsubscribe linux-usb" in >the body of a message to majord...@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html >-- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
