On Sat, Feb 19, 2011 at 5:03 AM, David Cohen <dacohen@xxxxxxxxx> wrote: > Hi, > > On Fri, Feb 18, 2011 at 7:08 PM, Lesly A M <leslyam@xxxxxx> wrote: >> Workaround for TWL5030 Silicon Errata 27 & 28: >> 27 - VDD1, VDD2, may have glitches when their output value is updated. >> 28 - VDD1 and / or VDD2 DCDC clock may stop working when internal clock >> is switched from internal to external. >> >> Errata 27: >> If the DCDC regulators is running on their internal oscillator, >> negative glitches may occur on VDD1, VDD2 output when voltage is changed. >> The OMAP device may reboot if the VDD1 or VDD2 go below the >> core minimum operating voltage. >> >> WORKAROUND >> Set up the TWL5030 DC-DC power supplies to use the HFCLKIN instead of >> the internal oscillator. >> >> Errata 28: >> VDD1/VDD2 clock system may hang during switching the clock source from >> internal oscillator to external. VDD1/VDD2 output voltages may collapse >> if clock stops. >> >> WORKAROUND >> If HFCLK is disabled in OFFMODE, modify the sleep/wakeup sequence and >> setuptimes to make sure the switching will happen only when HFCLKIN is stable. >> Also use the TWL5030 watchdog to safeguard the first switching from >> internal oscillator to HFCLKIN during the TWL5030 init. >> >> IMPACT >> setup time and the power sequence is changed. >> sleep/wakeup time values will be changed. >> >> The workaround changes are called from twl4030_power_init(), since we have to >> make some i2c_read calls to check the TRITON version & the i2c will not be >> initialized in the early stage. >> >> This workaround is required for TWL5030 Silicon version less than ES1.2 >> The power script & setup time changes are recommended by TI HW team. >> >> http://omapedia.org/wiki/TWL4030_power_scripts >> >> Changes taken from TRITON Errata27 workaround patch by Nishanth Menon. >> >> Signed-off-by: Lesly A M <leslyam@xxxxxx> >> Cc: Nishanth Menon <nm@xxxxxx> >> Cc: David Derrick <dderrick@xxxxxx> >> Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx> >> --- >> arch/arm/mach-omap2/omap_twl.c | 35 +++++++++ >> arch/arm/mach-omap2/twl4030.c | 115 +++++++++++++++++++++++++++++ >> arch/arm/plat-omap/include/plat/voltage.h | 2 + >> drivers/mfd/twl4030-power.c | 74 ++++++++++++++++++ >> include/linux/i2c/twl.h | 2 + >> 5 files changed, 228 insertions(+), 0 deletions(-) >> >> diff --git a/arch/arm/mach-omap2/omap_twl.c b/arch/arm/mach-omap2/omap_twl.c >> index f0feab9..d6984b8 100644 >> --- a/arch/arm/mach-omap2/omap_twl.c >> +++ b/arch/arm/mach-omap2/omap_twl.c >> @@ -176,6 +176,14 @@ >> #define OMAP3_CLKSETUP_RET 31 /* 30.5 uS */ >> #define OMAP3_CLKSETUP_OFF 10000 /* 10 mS */ >> >> +/* >> + * The clk/volt setuptime is adjusted to do the VDD1/VDD2 voltage rampup >> + * only after HFCLKIN is stabilized and the HFCLKOUT is enabled >> + */ >> +#define CLKSETUP_TWL5030_ERRATA27 11567 /* 11.567 mS */ >> +#define VOLTOFFSET_TWL5030_ERRATA27 516 /* 516 uS */ >> +#define VOLTSETUP2_TWL5030_ERRATA27 11079 /* 11.079 mS */ >> + >> static bool is_offset_valid; >> static u8 smps_offset; >> >> @@ -482,6 +490,33 @@ static struct omap_volt_pmic_info omap4_core_volt_info = { >> .uv_to_vsel = twl6030_uv_to_vsel, >> }; >> >> +/** >> + * omap3_twl5030_errata27() - update the clk & volt setup time. >> + * >> + * Api to update the clk & volt setup time for TWL5030 errata 27. >> + */ >> +void omap3_twl5030_errata27(void) >> +{ >> + if (!cpu_is_omap34xx()) >> + return; >> + >> + if (cpu_is_omap3630()) { >> + omap3630_mpu_volt_info.voltsetup_off.voltsetup2 = >> + VOLTSETUP2_TWL5030_ERRATA27; >> + omap3630_mpu_volt_info.voltsetup_off.voltoffset = >> + VOLTOFFSET_TWL5030_ERRATA27; >> + omap3630_mpu_volt_info.clksetup_off.clksetup = >> + CLKSETUP_TWL5030_ERRATA27; >> + } else { >> + omap3430_mpu_volt_info.voltsetup_off.voltsetup2 = >> + VOLTSETUP2_TWL5030_ERRATA27; >> + omap3430_mpu_volt_info.voltsetup_off.voltoffset = >> + VOLTOFFSET_TWL5030_ERRATA27; >> + omap3430_mpu_volt_info.clksetup_off.clksetup = >> + CLKSETUP_TWL5030_ERRATA27; >> + } >> +} >> + >> int __init omap4_twl_init(void) >> { >> struct voltagedomain *voltdm; >> diff --git a/arch/arm/mach-omap2/twl4030.c b/arch/arm/mach-omap2/twl4030.c >> index f3d05e5..b5fb496 100644 >> --- a/arch/arm/mach-omap2/twl4030.c >> +++ b/arch/arm/mach-omap2/twl4030.c >> @@ -137,10 +137,125 @@ static struct twl4030_resconfig twl4030_rconfig[] = { >> { 0, 0}, >> }; >> >> +/* >> + * Active to Sleep sequence, which is executed upon P1/P2/P3 >> + * transition for sleep. >> + * >> + * The sleep sequence is adjusted to do the switching of VDD1/VDD2/VIO OSC from >> + * HFCLKIN to internal oscillator when the HFCLKIN is stable. >> + */ >> +static struct twl4030_ins __initdata sleep_on_seq_errata27[] = { >> + /* >> + * Singular message to disable HCLKOUT. >> + * Wait for ~488.32 uS to do the switching of VDD1/VDD2/VIO OSC from >> + * HFCLKIN to internal oscillator before disabling HFCLKIN. >> + */ >> + {MSG_SINGULAR(DEV_GRP_NULL, RES_HFCLKOUT, RES_STATE_SLEEP), 20}, >> + /* Broadcast message to put res(TYPE2 = 1) to sleep */ >> + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R1, >> + RES_STATE_SLEEP), 2}, >> + /* Broadcast message to put res(TYPE2 = 2) to sleep, disable HFCLKIN */ >> + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R2, >> + RES_STATE_SLEEP), 2}, >> +}; >> + >> +static struct twl4030_script sleep_on_script_errata27 __initdata = { >> + .script = sleep_on_seq_errata27, >> + .size = ARRAY_SIZE(sleep_on_seq_errata27), >> + .flags = TWL4030_SLEEP_SCRIPT, >> +}; >> + >> +/* >> + * Sleep to Active sequence, which is executed upon P1/P2/P3 >> + * transition for wakeup. >> + * >> + * The wakeup sequence is adjusted to do the VDD1/VDD2 voltage rampup >> + * only after HFCLKIN is stabilized and the HFCLKOUT is enabled. >> + */ >> +static struct twl4030_ins wakeup_seq_errata27[] __initdata = { >> + /* >> + * Broadcast message to put res(TYPE2 = 2) to active. >> + * Wait for ~10 mS (rampup time for OSC on the board) >> + * after HFCLKIN is enabled >> + */ >> + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R2, >> + RES_STATE_ACTIVE), 55}, >> + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R2, >> + RES_STATE_ACTIVE), 55}, >> + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R2, >> + RES_STATE_ACTIVE), 54}, >> + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R2, >> + RES_STATE_ACTIVE), 1}, >> + /* Singular message to enable HCLKOUT after HFCLKIN is stabilized */ >> + {MSG_SINGULAR(DEV_GRP_NULL, RES_HFCLKOUT, RES_STATE_ACTIVE), 1}, >> + /* >> + * Broadcast message to put res(TYPE2 = 1) to active. >> + * VDD1/VDD2 rampup after HFCLKIN is stable and HFCLKOUT is enabled. >> + */ >> + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R1, >> + RES_STATE_ACTIVE), 2}, >> +}; >> + >> +static struct twl4030_script wakeup_script_errata27 __initdata = { >> + .script = wakeup_seq_errata27, >> + .size = ARRAY_SIZE(wakeup_seq_errata27), >> + .flags = TWL4030_WAKEUP12_SCRIPT | TWL4030_WAKEUP3_SCRIPT, >> +}; >> + >> +/* TRITON script for sleep, wakeup & warm_reset */ >> +static struct twl4030_script *twl4030_scripts_errata27[] __initdata = { >> + &sleep_on_script_errata27, >> + &wakeup_script_errata27, >> + &wrst_script, >> +}; >> + >> +/* >> + * VDD1/VDD2/VPLL are assigned to P1 and P3, to have better control >> + * during OFFMODE. HFCLKOUT is assigned to P1 and P3 (*p2) to turn off >> + * only during OFFMODE. >> + * (*P2 is included if the platform uses it for modem/some other processor) >> + */ >> +static struct twl4030_resconfig twl4030_rconfig_errata27[] = { >> + { .resource = RES_VPLL1, .devgroup = DEV_GRP_P1 | DEV_GRP_P3, >> + .type = 3, .type2 = 1, .remap_sleep = RES_STATE_OFF }, >> + { .resource = RES_VINTANA1, .devgroup = DEV_GRP_ALL, .type = 1, >> + .type2 = 2, .remap_sleep = RES_STATE_SLEEP }, >> + { .resource = RES_VINTANA2, .devgroup = DEV_GRP_ALL, .type = 0, >> + .type2 = 2, .remap_sleep = RES_STATE_SLEEP }, >> + { .resource = RES_VINTDIG, .devgroup = DEV_GRP_ALL, .type = 1, >> + .type2 = 2, .remap_sleep = RES_STATE_SLEEP }, >> + { .resource = RES_VIO, .devgroup = DEV_GRP_ALL, .type = 2, >> + .type2 = 2, .remap_sleep = RES_STATE_SLEEP }, >> + { .resource = RES_VDD1, .devgroup = DEV_GRP_P1 | DEV_GRP_P3, >> + .type = 4, .type2 = 1, .remap_sleep = RES_STATE_OFF }, >> + { .resource = RES_VDD2, .devgroup = DEV_GRP_P1 | DEV_GRP_P3, >> + .type = 3, .type2 = 1, .remap_sleep = RES_STATE_OFF }, >> + { .resource = RES_REGEN, .devgroup = DEV_GRP_ALL, .type = 2, >> + .type2 = 1, .remap_sleep = RES_STATE_SLEEP }, >> + { .resource = RES_NRES_PWRON, .devgroup = DEV_GRP_ALL, .type = 0, >> + .type2 = 1, .remap_sleep = RES_STATE_SLEEP }, >> + { .resource = RES_CLKEN, .devgroup = DEV_GRP_ALL, .type = 3, >> + .type2 = 2, .remap_sleep = RES_STATE_SLEEP }, >> + { .resource = RES_SYSEN, .devgroup = DEV_GRP_ALL, .type = 6, >> + .type2 = 1, .remap_sleep = RES_STATE_SLEEP }, >> + { .resource = RES_HFCLKOUT, .devgroup = DEV_GRP_P1 | DEV_GRP_P3, >> + .type = 0, .type2 = 1, .remap_sleep = RES_STATE_SLEEP }, >> + { 0, 0}, >> +}; >> + >> +void twl5030_script_errata27(void) >> +{ >> + twl4030_generic_script.scripts = twl4030_scripts_errata27; >> + twl4030_generic_script.num = ARRAY_SIZE(twl4030_scripts_errata27); >> + twl4030_generic_script.resource_config = twl4030_rconfig_errata27; >> +} >> + >> struct twl4030_power_data twl4030_generic_script = { >> .scripts = twl4030_scripts, >> .num = ARRAY_SIZE(twl4030_scripts), >> .resource_config = twl4030_rconfig, >> + .twl5030_errata27wa_vcsetup = omap3_twl5030_errata27, >> + .twl5030_errata27wa_script = twl5030_script_errata27, >> }; >> EXPORT_SYMBOL(twl4030_generic_script); >> #endif >> diff --git a/arch/arm/plat-omap/include/plat/voltage.h b/arch/arm/plat-omap/include/plat/voltage.h >> index 2d737b9..c9d899b 100644 >> --- a/arch/arm/plat-omap/include/plat/voltage.h >> +++ b/arch/arm/plat-omap/include/plat/voltage.h >> @@ -152,6 +152,7 @@ struct dentry *omap_voltage_get_dbgdir(struct voltagedomain *voltdm); >> int omap_voltage_register_pmic(struct voltagedomain *voltdm, >> struct omap_volt_pmic_info *pmic_info); >> void omap3_voltage_vc_update(int core_next_state); >> +void omap3_twl5030_errata27(void); >> void omap_change_voltscale_method(struct voltagedomain *voltdm, >> int voltscale_method); >> /* API to get the voltagedomain pointer */ >> @@ -165,6 +166,7 @@ static inline int omap_voltage_register_pmic(struct voltagedomain *voltdm, >> return -EINVAL; >> } >> void omap3_voltage_vc_update(int core_next_state) {} >> +void omap3_twl5030_errata27(void) {} >> static inline void omap_change_voltscale_method(struct voltagedomain *voltdm, >> int voltscale_method) {} >> static inline int omap_voltage_late_init(void) >> diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c >> index 8373d79..cc8a137 100644 >> --- a/drivers/mfd/twl4030-power.c >> +++ b/drivers/mfd/twl4030-power.c >> @@ -63,6 +63,14 @@ static u8 twl4030_start_script_address = 0x2b; >> #define R_MEMORY_ADDRESS PHY_TO_OFF_PM_MASTER(0x59) >> #define R_MEMORY_DATA PHY_TO_OFF_PM_MASTER(0x5a) >> >> +#define R_VDD1_OSC 0x5C >> +#define R_VDD2_OSC 0x6A >> +#define R_VIO_OSC 0x52 >> +#define EXT_FS_CLK_EN (0x1 << 6) >> + >> +#define R_WDT_CFG 0x03 >> +#define WDT_WRK_TIMEOUT 0x03 >> + >> /* resource configuration registers >> <RESOURCE>_DEV_GRP at address 'n+0' >> <RESOURCE>_TYPE at address 'n+1' >> @@ -511,6 +519,60 @@ int twl4030_remove_script(u8 flags) >> return err; >> } >> >> +/** >> + * twl_errata27_workaround() - Workaround for TWL5030 Silicon Errata 27 & 28: >> + * 27 - VDD1, VDD2, may have glitches when their output value is updated. >> + * 28 - VDD1 and / or VDD2 DCDC clock may stop working when internal clock is >> + * switched from internal to external. >> + * >> + * Workaround requires the TWL DCDCs to use HFCLK instead of >> + * internal oscillator. Also enable TWL watchdog before switching the osc >> + * to recover if the VDD1/VDD2 stop working. >> + */ >> +static void __init twl_errata27_workaround(void) >> +{ >> + u8 val; >> + u8 smps_osc_reg[] = {R_VDD1_OSC, R_VDD2_OSC, R_VIO_OSC}; >> + u8 wdt_counter_val = 0; >> + int i; >> + int err; >> + >> + /* Setup the twl wdt to take care of borderline failure case */ >> + err = twl_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &wdt_counter_val, >> + R_WDT_CFG); >> + err |= twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, WDT_WRK_TIMEOUT, >> + R_WDT_CFG); >> + >> + for (i = 0; i < sizeof(smps_osc_reg); i++) { >> + err |= twl_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &val, >> + smps_osc_reg[i]); >> + val |= EXT_FS_CLK_EN; >> + err |= twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, val, >> + smps_osc_reg[i]); >> + } >> + >> + /* restore the original value */ >> + err |= twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, wdt_counter_val, >> + R_WDT_CFG); >> + if (err) >> + pr_warning("TWL4030: workaround setup failed!\n"); >> +} >> + >> +bool is_twl5030_errata27wa_required(void) >> +{ >> + u32 twl5030_si_ver; >> + int ret = 0; >> + >> + ret = twl5030_get_si_ver(&twl5030_si_ver); >> + if (ret) >> + pr_warning("TWL4030: Unable to get the Si version\n"); > > You can get rid of 'ret'. What about: > if (twl5030_get_si_ver(&twl5030_si_ver)) > pr_warning("TWL4030: Unable to get the Si version\n"); Ok >> + >> + if (twl5030_si_ver < TWL5030_REV_1_2) >> + return true; >> + else >> + return false; > > No need to if...else here. You can: > return twl5030_si_ver < TWL5030_REV_1_2; Ok, I will change it Regards, Lesly A M >> +} >> + >> void __init twl4030_power_init(struct twl4030_power_data *twl4030_scripts) >> { >> int err = 0; >> @@ -530,6 +592,18 @@ void __init twl4030_power_init(struct twl4030_power_data *twl4030_scripts) >> if (err) >> goto unlock; >> >> + /* Applying TWL5030 Errata 27 WA based on Si revision & >> + * flag updated from board file*/ >> + if (is_twl5030_errata27wa_required()) { >> + pr_info("TWL5030: Enabling workaround for Si Errata 27\n"); >> + twl_errata27_workaround(); >> + if (twl4030_scripts->twl5030_errata27wa_vcsetup) >> + twl4030_scripts->twl5030_errata27wa_vcsetup(); >> + >> + if (twl4030_scripts->twl5030_errata27wa_script) >> + twl4030_scripts->twl5030_errata27wa_script(); >> + } >> + >> for (i = 0; i < twl4030_scripts->num; i++) { >> err = load_twl4030_script(twl4030_scripts->scripts[i], address); >> if (err) >> diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h >> index 5d3f2bf..26232f3 100644 >> --- a/include/linux/i2c/twl.h >> +++ b/include/linux/i2c/twl.h >> @@ -667,6 +667,8 @@ struct twl4030_power_data { >> struct twl4030_script **scripts; >> unsigned num; >> struct twl4030_resconfig *resource_config; >> + void (*twl5030_errata27wa_vcsetup)(void); >> + void (*twl5030_errata27wa_script)(void); >> #define TWL4030_RESCONFIG_UNDEF ((u8)-1) >> }; >> >> -- >> 1.7.1 >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-omap" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> 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 majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
