> -----Original Message----- > From: Kevin Hilman [mailto:[email protected]] > Sent: Wednesday, March 02, 2011 3:15 AM > To: Vishwanath BS > Cc: [email protected]; [email protected] > Subject: Re: [PATCH 3/3] OMAP36xx PM: Updated C state latencies for > OMAP3630 > > Vishwanath BS <[email protected]> writes: > > > This patch has changes to update the C state latencies for OMAP3630 > and > > disables the useless C-States, keeping only the optimized ones with > their > > corresponding measured latencies. > > I think "useless" vs. "optimized" here are not the right words, and > doesn't summarize the problem being solved. > > If I understood Nicole and Vincent's summary it was that there is no > significant power savings between some of the states, so they are not > necessary. Yes, also some of the C states were consuming more power than deeper C state.
> > Also, I believe Nicole & Vincent's research applies to both 34xx and > 36xx. I need to check. AFAIK, the experiments were done on OMAP3630 boards. > > > Only 4 C-states are kept instead of 7 > > C-States: > > * C1 . MPU WFI clock gated + Core autogating > > * C3 . MPU CSWR + Core inactive > > * C5 . MPU CSWR + Core CSWR > > * C7 . MPU OFF + Core OFF > > > > Thanks to Nicole Chaloub<[email protected]> and Vincent Bour <v- > [email protected]> > > for their investigation. > > > > Tested on ZOOM3 board using latest pm branch. > > > > Signed-off-by: Vishwanath BS <[email protected]> > > --- > > arch/arm/mach-omap2/board-3630sdp.c | 19 > +++++++++++++++++++ > > arch/arm/mach-omap2/board-zoom.c | 19 > +++++++++++++++++++ > > Why are these added as board-specific changes? > > If these are to be the default 3630 CPUidle states, add a default 36xx > cpuidle_params_table along side the 34xx one and have CPUidle pick the > right one at runtime. Yes, I can do that. Vishwa > > Kevin > > > 2 files changed, 38 insertions(+), 0 deletions(-) > > > > diff --git a/arch/arm/mach-omap2/board-3630sdp.c b/arch/arm/mach- > omap2/board-3630sdp.c > > index 6264564..8d05fc9 > > --- a/arch/arm/mach-omap2/board-3630sdp.c > > +++ b/arch/arm/mach-omap2/board-3630sdp.c > > @@ -25,6 +25,24 @@ > > #include "board-flash.h" > > #include "mux.h" > > #include "sdram-hynix-h8mbx00u0mer-0em.h" > > +#include "pm.h" > > + > > +static struct cpuidle_params omap36xx_cpuidle_params_table[] = { > > + /* C1 */ > > + {1, 74, 78, 152}, > > + /* C2 */ > > + {0, 165, 90, 255}, > > + /* C3 */ > > + {1, 163, 180, 345}, > > + /* C4 */ > > + {0, 2852, 605, 3457}, > > + /* C5 */ > > + {1, 800, 366, 2120}, > > + /* C6 */ > > + {0, 4080, 801, 4881}, > > + /* C7 */ > > + {1, 4300, 8794, 159000}, > > +}; > > > > #if defined(CONFIG_SMC91X) || defined(CONFIG_SMC91X_MODULE) > > > > @@ -212,6 +230,7 @@ static void __init omap_sdp_init(void) > > board_flash_init(sdp_flash_partitions, chip_sel_sdp); > > enable_board_wakeup_source(); > > usb_ehci_init(&ehci_pdata); > > + omap3_pm_init_cpuidle(omap36xx_cpuidle_params_table); > > } > > > > MACHINE_START(OMAP_3630SDP, "OMAP 3630SDP board") > > diff --git a/arch/arm/mach-omap2/board-zoom.c b/arch/arm/mach- > omap2/board-zoom.c > > index e26754c..6bd364a > > --- a/arch/arm/mach-omap2/board-zoom.c > > +++ b/arch/arm/mach-omap2/board-zoom.c > > @@ -30,6 +30,24 @@ > > #include "mux.h" > > #include "sdram-micron-mt46h32m32lf-6.h" > > #include "sdram-hynix-h8mbx00u0mer-0em.h" > > +#include "pm.h" > > + > > +static struct cpuidle_params omap36xx_cpuidle_params_table[] = { > > + /* C1 */ > > + {1, 74, 78, 152}, > > + /* C2 */ > > + {0, 165, 90, 255}, > > + /* C3 */ > > + {1, 163, 180, 345}, > > + /* C4 */ > > + {0, 2852, 605, 3457}, > > + /* C5 */ > > + {1, 800, 366, 2120}, > > + /* C6 */ > > + {0, 4080, 801, 4881}, > > + /* C7 */ > > + {1, 4300, 8794, 159000}, > > +}; > > > > #define ZOOM3_EHCI_RESET_GPIO 64 > > > > @@ -126,6 +144,7 @@ static void __init omap_zoom_init(void) > > usb_ehci_init(&ehci_pdata); > > } > > > > + omap3_pm_init_cpuidle(omap36xx_cpuidle_params_table); > > board_nand_init(zoom_nand_partitions, > > ARRAY_SIZE(zoom_nand_partitions), > ZOOM_NAND_CS); > > zoom_debugboard_init(); -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
