From: Tony Lindgren <tony@atomide.com>
To: Kalle Jokiniemi <ext-kalle.jokiniemi@nokia.com>
Cc: linux-omap@vger.kernel.org,
ext Peter 'p2' De Schrijver <peter.de-schrijver@nokia.com>
Subject: Re: [PATCH] Load triton2 scripts.
Date: Tue, 19 Aug 2008 10:13:28 +0300 [thread overview]
Message-ID: <20080819071328.GG17276@atomide.com> (raw)
In-Reply-To: <1219129323.1876.5.camel@kj-ubuntu>
* Kalle Jokiniemi <ext-kalle.jokiniemi@nokia.com> [080819 09:59]:
> On ma, 2008-08-18 at 16:31 +0300, ext Tony Lindgren wrote:
> > * Kalle Jokiniemi <ext-kalle.jokiniemi@nokia.com> [080807 13:10]:
> > > Hi Tony,
> > >
> > > This patch should be safe to apply now as the sys off mode pin polarity
> > > was fixed in the patch "Add early init for voltage controller
> > > configuration and off mode polarity" (index a6cfc46..fc72c11 100644).
> > >
> > > I compile & boot tested it on SDP board, on both plain master branch and
> > > with Jouni's workarounds. Works for me.
> >
> > Hmm, just to confirm... Isn't this one already applied modified with
> > commits 07667f11a9864671bcec35dd0ee36e47cb3f675c and
> > 3238fb156cf77b537b2df8d897fe62a7feab4939? Can you please check and
> > let me know if something still needs to be patched.
>
> I checked. No, those patches do not apply the triton2 script loading.
> They configure the voltage controller and set the off-mode polarity,
> which are needed before applying the triton script loading patch.
>
> So you still need to apply the "Load triton2 scripts" patch sent by
> Peter De Schrijver. If you wish, I can resend it.
OK, thanks. Yeah a resend would be nice!
Tony
>
> regards,
> Kalle
>
>
> >
> > Thanks,
> >
> > Tony
> >
> > >
> > > regards,
> > > Kalle
> > >
> > > On ma, 2008-07-21 at 19:17 +0300, ext Peter 'p2' De Schrijver wrote:
> > > > Signed-off-by: Peter 'p2' De Schrijver <peter.de-schrijver@nokia.com>
> > > > ---
> > > > drivers/i2c/chips/Makefile | 2 +-
> > > > drivers/i2c/chips/twl4030-power.c | 337 +++++++++++++++++++++++++++++++++++++
> > > > 2 files changed, 338 insertions(+), 1 deletions(-)
> > > > create mode 100644 drivers/i2c/chips/twl4030-power.c
> > > >
> > > > diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile
> > > > index 1f81ebd..a44e617 100644
> > > > --- a/drivers/i2c/chips/Makefile
> > > > +++ b/drivers/i2c/chips/Makefile
> > > > @@ -23,7 +23,7 @@ obj-$(CONFIG_GPIOEXPANDER_OMAP) += gpio_expander_omap.o
> > > > obj-$(CONFIG_MENELAUS) += menelaus.o
> > > > obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o
> > > > obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
> > > > -obj-$(CONFIG_TWL4030_CORE) += twl4030-core.o twl4030-pwrirq.o
> > > > +obj-$(CONFIG_TWL4030_CORE) += twl4030-core.o twl4030-pwrirq.o twl4030-power.o
> > > > obj-$(CONFIG_TWL4030_GPIO) += twl4030-gpio.o
> > > > obj-$(CONFIG_TWL4030_USB) += twl4030-usb.o
> > > > obj-$(CONFIG_TWL4030_POWEROFF) += twl4030-poweroff.o
> > > > diff --git a/drivers/i2c/chips/twl4030-power.c b/drivers/i2c/chips/twl4030-power.c
> > > > new file mode 100644
> > > > index 0000000..195c3c4
> > > > --- /dev/null
> > > > +++ b/drivers/i2c/chips/twl4030-power.c
> > > > @@ -0,0 +1,337 @@
> > > > +/*
> > > > + * linux/drivers/i2c/chips/twl4030-power.c
> > > > + *
> > > > + * Handle TWL4030 Power initialization
> > > > + *
> > > > + * Copyright (C) 2008 Nokia Corporation
> > > > + * Copyright (C) 2006 Texas Instruments, Inc
> > > > + *
> > > > + * Written by Kalle Jokiniemi
> > > > + * Peter De Schrijver <peter.de-schrijver@nokia.com>
> > > > + *
> > > > + * This file is subject to the terms and conditions of the GNU General
> > > > + * Public License. See the file "COPYING" in the main directory of this
> > > > + * archive for more details.
> > > > + *
> > > > + * This program is distributed in the hope that it will be useful,
> > > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > > > + * GNU General Public License for more details.
> > > > + *
> > > > + * You should have received a copy of the GNU General Public License
> > > > + * along with this program; if not, write to the Free Software
> > > > + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> > > > + */
> > > > +
> > > > +#include <linux/module.h>
> > > > +#include <linux/pm.h>
> > > > +#include <linux/i2c/twl4030.h>
> > > > +
> > > > +#define PWR_P1_SW_EVENTS 0x10
> > > > +#define PWR_DEVOFF (1<<0)
> > > > +
> > > > +#define PHY_TO_OFF_PM_MASTER(p) (p - 0x36)
> > > > +#define PHY_TO_OFF_PM_RECIEVER(p) (p - 0x5b)
> > > > +
> > > > +/* resource - hfclk */
> > > > +#define R_HFCLKOUT_DEV_GRP PHY_TO_OFF_PM_RECIEVER(0xe6)
> > > > +
> > > > +/* PM events */
> > > > +#define R_P1_SW_EVENTS PHY_TO_OFF_PM_MASTER(0x46)
> > > > +#define R_P2_SW_EVENTS PHY_TO_OFF_PM_MASTER(0x47)
> > > > +#define R_P3_SW_EVENTS PHY_TO_OFF_PM_MASTER(0x48)
> > > > +#define R_CFG_P1_TRANSITION PHY_TO_OFF_PM_MASTER(0x36)
> > > > +#define R_CFG_P2_TRANSITION PHY_TO_OFF_PM_MASTER(0x37)
> > > > +#define R_CFG_P3_TRANSITION PHY_TO_OFF_PM_MASTER(0x38)
> > > > +
> > > > +#define LVL_WAKEUP 0x08
> > > > +
> > > > +#define ENABLE_WARMRESET (1<<4)
> > > > +
> > > > +/* sequence script */
> > > > +
> > > > +#define END_OF_SCRIPT 0x3f
> > > > +
> > > > +#define R_SEQ_ADD_A2S PHY_TO_OFF_PM_MASTER(0x55)
> > > > +#define R_SEQ_ADD_SA12 PHY_TO_OFF_PM_MASTER(0x56)
> > > > +#define R_SEQ_ADD_S2A3 PHY_TO_OFF_PM_MASTER(0x57)
> > > > +#define R_SEQ_ADD_WARM PHY_TO_OFF_PM_MASTER(0x58)
> > > > +#define R_MEMORY_ADDRESS PHY_TO_OFF_PM_MASTER(0x59)
> > > > +#define R_MEMORY_DATA PHY_TO_OFF_PM_MASTER(0x5a)
> > > > +
> > > > +/* Power bus message definitions */
> > > > +
> > > > +#define DEV_GRP_NULL 0x0
> > > > +#define DEV_GRP_P1 0x1
> > > > +#define DEV_GRP_P2 0x2
> > > > +#define DEV_GRP_P3 0x4
> > > > +
> > > > +#define RES_GRP_RES 0x0
> > > > +#define RES_GRP_PP 0x1
> > > > +#define RES_GRP_RC 0x2
> > > > +#define RES_GRP_PP_RC 0x3
> > > > +#define RES_GRP_PR 0x4
> > > > +#define RES_GRP_PP_PR 0x5
> > > > +#define RES_GRP_RC_PR 0x6
> > > > +#define RES_GRP_ALL 0x7
> > > > +
> > > > +#define RES_TYPE2_R0 0x0
> > > > +
> > > > +#define RES_TYPE_ALL 0x7
> > > > +
> > > > +#define RES_STATE_WRST 0xF
> > > > +#define RES_STATE_ACTIVE 0xE
> > > > +#define RES_STATE_SLEEP 0x8
> > > > +#define RES_STATE_OFF 0x0
> > > > +
> > > > +/*
> > > > +* Power Bus Message Format
> > > > +*
> > > > +* Broadcast Message (16 Bits)
> > > > +* DEV_GRP[15:13] MT[12] RES_GRP[11:9] RES_TYPE2[8:7] RES_TYPE[6:4]
> > > > +* RES_STATE[3:0]
> > > > +*
> > > > +* Singular Message (16 Bits)
> > > > +* DEV_GRP[15:13] MT[12] RES_ID[11:4] RES_STATE[3:0]
> > > > +*
> > > > +*/
> > > > +
> > > > +#define MSG_BROADCAST(devgrp, grp, type, type2, state) \
> > > > + (devgrp << 13 | 1 << 12 | grp << 9 | type2 << 7 | type << 4 | state)
> > > > +
> > > > +#define MSG_SINGULAR(devgrp, id, state) \
> > > > + (devgrp << 13 | 0 << 12 | id << 4 | state)
> > > > +
> > > > +#define R_PROTECT_KEY 0x0E
> > > > +#define KEY_1 0xC0
> > > > +#define KEY_2 0x0C
> > > > +
> > > > +struct triton_ins {
> > > > + u16 pmb_message;
> > > > + u8 delay;
> > > > +};
> > > > +
> > > > +
> > > > +#define CONFIG_DISABLE_HFCLK 1
> > > > +
> > > > +#if defined(CONFIG_MACH_OMAP_3430SDP) || defined(CONFIG_MACH_OMAP_3430LABRADOR)
> > > > +
> > > > +struct triton_ins sleep_on_seq[] __initdata = {
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0xf, RES_STATE_OFF), 4},
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0x10, RES_STATE_OFF), 2},
> > > > +#ifdef CONFIG_DISABLE_HFCLK
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0x7, RES_STATE_OFF), 3},
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0x19, RES_STATE_OFF), 3},
> > > > +#endif /* #ifdef CONFIG_DISABLE_HFCLK */
> > > > +};
> > > > +
> > > > +struct triton_ins sleep_off_seq[] __initdata = {
> > > > +#ifndef CONFIG_DISABLE_HFCLK
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0xf, RES_STATE_ACTIVE), 4},
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0x10, RES_STATE_ACTIVE), 2},
> > > > +#else
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0x7, RES_STATE_ACTIVE), 0x30},
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0xf, RES_STATE_ACTIVE), 0x30},
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0x10, RES_STATE_ACTIVE), 0x37},
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0x19, RES_STATE_ACTIVE), 3},
> > > > +#endif /* #ifndef CONFIG_DISABLE_HFCLK */
> > > > +};
> > > > +
> > > > +struct triton_ins t2_wrst_seq[] __initdata = {
> > > > + {MSG_SINGULAR(DEV_GRP_NULL, 0x1b, RES_STATE_OFF), 2},
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0xf, RES_STATE_WRST), 15},
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0x10, RES_STATE_WRST), 15},
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0x7, RES_STATE_WRST), 0x60},
> > > > + {MSG_SINGULAR(DEV_GRP_P1, 0x19, RES_STATE_ACTIVE), 2},
> > > > + {MSG_SINGULAR(DEV_GRP_NULL, 0x1b, RES_STATE_ACTIVE), 2},
> > > > +};
> > > > +#else
> > > > +struct triton_ins sleep_on_seq[] __initdata = {
> > > > + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_RC, RES_TYPE_ALL, RES_TYPE2_R0,
> > > > + RES_STATE_SLEEP), 4},
> > > > + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_ALL, RES_TYPE_R7,
> > > > + RES_STATE_SLEEP), 4},
> > > > +};
> > > > +
> > > > +struct triton_ins sleep_off_seq[] __initdata = {
> > > > + {MSG_SINGULAR(DEV_GRP_NULL, 0x17, RES_STATE_ACTIVE), 0x30},
> > > > + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_PP_PR, RES_TYPE_ALL, RES_TYPE2_R0,
> > > > + RES_STATE_ACTIVE), 0x37},
> > > > + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_ALL, RES_TYPE2_R0,
> > > > + RES_STATE_ACTIVE), 0x2},
> > > > +};
> > > > +#endif
> > > > +
> > > > +static int __init twl4030_write_script_byte(u8 address, u8 byte)
> > > > +{
> > > > + int err;
> > > > +
> > > > + err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, address,
> > > > + R_MEMORY_ADDRESS);
> > > > + err |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, byte,
> > > > + R_MEMORY_DATA);
> > > > +
> > > > + return err;
> > > > +}
> > > > +
> > > > +static int __init twl4030_write_script_ins(u8 address, u16 pmb_message,
> > > > + u8 delay, u8 next)
> > > > +{
> > > > + int err = 0;
> > > > +
> > > > + address *= 4;
> > > > + err |= twl4030_write_script_byte(address++, pmb_message >> 8);
> > > > + err |= twl4030_write_script_byte(address++, pmb_message & 0xff);
> > > > + err |= twl4030_write_script_byte(address++, delay);
> > > > + err |= twl4030_write_script_byte(address++, next);
> > > > +
> > > > + return err;
> > > > +}
> > > > +
> > > > +static int __init twl4030_write_script(u8 address, struct triton_ins *script,
> > > > + int len)
> > > > +{
> > > > + int err = 0;
> > > > +
> > > > + for (; len; len--, address++, script++) {
> > > > + if (len == 1)
> > > > + err |= twl4030_write_script_ins(address,
> > > > + script->pmb_message,
> > > > + script->delay,
> > > > + END_OF_SCRIPT);
> > > > + else
> > > > + err |= twl4030_write_script_ins(address,
> > > > + script->pmb_message,
> > > > + script->delay,
> > > > + address + 1);
> > > > + }
> > > > +
> > > > + return err;
> > > > +}
> > > > +
> > > > +static int __init config_sleep_wake_sequence(void)
> > > > +{
> > > > + int err = 0;
> > > > + u8 data;
> > > > +
> > > > + /*
> > > > + * CLKREQ is pulled high on the 2430SDP, therefore, we need to take
> > > > + * it out of the HFCLKOUT DEV_GRP for P1 else HFCLKOUT can't be stopped.
> > > > + */
> > > > +
> > > > + err |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
> > > > + 0x20, R_HFCLKOUT_DEV_GRP);
> > > > +
> > > > + /* Set ACTIVE to SLEEP SEQ address in T2 memory*/
> > > > + err |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0x2B,
> > > > + R_SEQ_ADD_A2S);
> > > > +
> > > > + /* Set SLEEP to ACTIVE SEQ address for P1 and P2 */
> > > > + err |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0x2F,
> > > > + R_SEQ_ADD_SA12);
> > > > +
> > > > + /* Set SLEEP to ACTIVE SEQ address for P3 */
> > > > + err |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0x2F,
> > > > + R_SEQ_ADD_S2A3);
> > > > +
> > > > + /* Install Active->Sleep (A2S) sequence */
> > > > + err |= twl4030_write_script(0x2B, sleep_on_seq,
> > > > + ARRAY_SIZE(sleep_on_seq));
> > > > +
> > > > + /* Install Sleep->Active (S2A) sequence */
> > > > + err |= twl4030_write_script(0x2F, sleep_off_seq,
> > > > + ARRAY_SIZE(sleep_off_seq));
> > > > +
> > > > +#if defined(CONFIG_MACH_OMAP_3430SDP) || defined(CONFIG_MACH_OMAP_3430LABRADOR)
> > > > + /* Disabling AC charger effect on sleep-active transitions */
> > > > + err |= twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &data,
> > > > + R_CFG_P1_TRANSITION);
> > > > + data &= 0x0;
> > > > + err |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, data ,
> > > > + R_CFG_P1_TRANSITION);
> > > > +#endif
> > > > + /* P1/P2/P3 LVL_WAKEUP should be on LEVEL */
> > > > + err |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, LVL_WAKEUP,
> > > > + R_P1_SW_EVENTS);
> > > > + err |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, LVL_WAKEUP,
> > > > + R_P2_SW_EVENTS);
> > > > + err |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, LVL_WAKEUP,
> > > > + R_P3_SW_EVENTS);
> > > > +
> > > > + if (err)
> > > > + printk(KERN_ERR "TWL4030 sleep-wake sequence config error\n");
> > > > +
> > > > + return err;
> > > > +}
> > > > +
> > > > +
> > > > +/* Programming the WARMRESET Sequence on TRITON */
> > > > +static int __init config_warmreset_sequence(void)
> > > > +{
> > > > +
> > > > + int e = 0;
> > > > + u8 rd_data;
> > > > +
> > > > + if (!ARRAY_SIZE(t2_wrst_seq))
> > > > + return 0;
> > > > +
> > > > + /* Set WARM RESET SEQ address for P1 */
> > > > + e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0x38,
> > > > + R_SEQ_ADD_WARM);
> > > > +
> > > > + /* Install Warm Reset sequence */
> > > > + e |= twl4030_write_script(0x38, t2_wrst_seq,
> > > > + ARRAY_SIZE(t2_wrst_seq));
> > > > +
> > > > + /* P1/P2/P3 enable WARMRESET */
> > > > + e |= twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &rd_data,
> > > > + R_P1_SW_EVENTS);
> > > > + rd_data |= ENABLE_WARMRESET;
> > > > + e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, rd_data,
> > > > + R_P1_SW_EVENTS);
> > > > +
> > > > + e |= twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &rd_data,
> > > > + R_P2_SW_EVENTS);
> > > > + rd_data |= ENABLE_WARMRESET;
> > > > + e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, rd_data,
> > > > + R_P2_SW_EVENTS);
> > > > +
> > > > + e |= twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &rd_data,
> > > > + R_P3_SW_EVENTS);
> > > > + rd_data |= ENABLE_WARMRESET;
> > > > + e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, rd_data,
> > > > + R_P3_SW_EVENTS);
> > > > +
> > > > + if (e)
> > > > + printk(KERN_ERR
> > > > + "TWL4030 Power Companion Warmreset seq config error\n");
> > > > + return e;
> > > > +}
> > > > +
> > > > +static int __init twl4030_power_init(void)
> > > > +{
> > > > + int err = 0;
> > > > +
> > > > + err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_1,
> > > > + R_PROTECT_KEY);
> > > > + err |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_2,
> > > > + R_PROTECT_KEY);
> > > > +
> > > > + if (err)
> > > > + return err;
> > > > +
> > > > + err = config_sleep_wake_sequence();
> > > > + if (err)
> > > > + return err;
> > > > +
> > > > + err = config_warmreset_sequence();
> > > > + if (err)
> > > > + return err;
> > > > +
> > > > + err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, R_PROTECT_KEY);
> > > > +
> > > > + return err;
> > > > +
> > > > +}
> > > > +
> > > > +module_init(twl4030_power_init);
next prev parent reply other threads:[~2008-08-19 7:13 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-21 16:17 RFC: OMAP3 SYS_OFF_MODE support Peter 'p2' De Schrijver
2008-07-21 16:17 ` [PATCH] Set correct off mode polarity Peter 'p2' De Schrijver
2008-07-21 16:17 ` [PATCH] Enable SYSOFFMODE use Peter 'p2' De Schrijver
2008-07-21 16:17 ` [PATCH] Add SYSOFFMODE option Peter 'p2' De Schrijver
2008-07-21 16:17 ` [PATCH] Load triton2 scripts Peter 'p2' De Schrijver
2008-08-07 10:12 ` Kalle Jokiniemi
2008-08-18 13:31 ` Tony Lindgren
2008-08-19 7:02 ` Kalle Jokiniemi
2008-08-19 7:13 ` Tony Lindgren [this message]
2008-07-22 12:05 ` OMAP3 SYS_OFF_MODE support TK, Pratheesh Gangadhar
2008-07-22 14:26 ` Rangasamy, Devaraj
2008-07-23 13:42 ` Peter 'p2' De Schrijver
2008-07-24 7:30 ` Rangasamy, Devaraj
2008-07-24 13:37 ` Peter 'p2' De Schrijver
2008-08-25 10:27 ` RFC: " Kalle Jokiniemi
-- strict thread matches above, loose matches on Subject: below --
2008-08-25 10:31 [PATCH] Load triton2 scripts Kalle Jokiniemi
2008-09-11 0:08 ` Tony Lindgren
2008-09-11 3:20 ` Steve Sakoman
2008-09-11 8:26 ` Koen Kooi
2008-09-11 8:50 ` Kevin Hilman
2008-07-21 16:02 [PATCH] Set correct off mode polarity Peter 'p2' De Schrijver
2008-07-21 16:02 ` [PATCH] Enable SYSOFFMODE use Peter 'p2' De Schrijver
2008-07-21 16:02 ` [PATCH] Add SYSOFFMODE option Peter 'p2' De Schrijver
2008-07-21 16:02 ` [PATCH] Load triton2 scripts Peter 'p2' De Schrijver
2008-07-21 17:32 ` Felipe Balbi
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--in-reply-to=20080819071328.GG17276@atomide.com \
--to=tony@atomide.com \
--cc=ext-kalle.jokiniemi@nokia.com \
--cc=linux-omap@vger.kernel.org \
--cc=peter.de-schrijver@nokia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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