Dňa 17. 1. 2022 o 10:08 Hans de Goede napísal(a):

Hi,

On 1/17/22 09:39, Miroslav Bendík wrote:

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[AMD Official Use Only]

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Now i am trying to change ASF registers instead of SMBus registers.
I have tried to enable interrupts and set listen address, but it don't
work or
i can't recognize the difference between interrupts generated by
transfers and
interrupts generated from slave.

Try reading the value of SFx0A ASFStatus bit 5 (it's write to clear if it's an interrupt).

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outb_p(0x02, 0x15 + piix4_smba); // SlaveIntrListenEn
outb_p(0x2c << 1 | 0x01, 0x09 + piix4_smba); // ListenAdr | ListenAdrEn

ASFx04 SlaveAddress instead of  ASFx09 ListenAdr
?

Little bit more informations:

Interrupts are generated only if ASFx09 ListenAdr is:

(0x08 << 1) | 0x01
(0x10 << 1) | 0x01

and touchpad is initialized with synaptics_intertouch=1

There is maybe small correlation between frequency and touch, but i am
not 100% sure.

I know very litlle about this, but I believe that when using
host-notify that after receiving the host-notify you are supposed to
do an I2C read from the SMBus Alert Response Address (ARA, 0x0c) to find
out the source of the notify (since multiple devices on the bus may
be notify capable). I guess that the controller may not do that itself
and that as long as you have not done it the touchpad may keep repeating
the notify.

But as said I know very little about this, so take this with a big
grain of salt :)  I guess you may want to read up a bit on how this
is supposed to work at the bus level. I believe that the SMBUS spec
is public.

Regards,

Hans

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There are no register changed in interrupt handler except of
ASFx13 DataBankSel. I can't determine if interrupt is generated from
transfer, or from external event.

ASF should be system for remote management. It should have access to
SMBus and data / command registers are identical, this means, that SMBus
should work (except block transfers).

If ASF just mirrors SMBus, then question is, why i can't access to
touchpad using SMBus? One strange thing is, that i2cdetect on standard
SMbus (0xb00), port 0 returns:

      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- 36 37 -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 -- -- -- -- -- -- -- 58 -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

Address 0x58 is exactly 0x2c (synaptics) moved 1 bit left, but i2c-piix4
correctly moves address.

Hello,
i have no response from 0x0c (ARA). It returns -6 (ENXIO).

Exact call is:

i2c_smbus_xfer(piix4_aux_adapter, 0x0c, 0x00, I2C_SMBUS_READ, 0x00, 
I2C_SMBUS_BYTE, &data)

I hava played with ARP (address 0x61), but alweays without response (-6).

I have tried to read event status from ASF. Exact command is 0000 0001b
and subcommand 0001 0010b from ASF reference documentation. I have
enabled automatic PEC appending. I have tried to manually calculate PEC
too. To calculate PEC i have called i2c_smbus_pec with data {0xaa/b,
0x01, 0x03, 0x12, 0x10, 0x00} and then set PEC byte register, but every
call ends wih -6 (no response from device).

ASF sensor address should be 0x55 is (from register ASFx0F SensorAdr
- 0xaa shifted 1 bit right).

Exact code:

outb_p(0x20, SMBHSTCNT); // Automatically append PEC

data.block[0] = 0x03; // size
data.block[1] = 0x12; // subcommand
data.block[2] = 0x10; // version
data.block[3] = 0x00; // reserved
status = i2c_smbus_xfer(piix4_aux_adapter, 0x55, 0x00, I2C_SMBUS_WRITE, 
0x01, I2C_SMBUS_BLOCK_DATA, &data);

Interrupts are always generated after transactions. Following conditions
are necessary to generate interrupts spontaneously:

- SlaveIntrListenEn of ASFx15 SlaveEn bit set
- ListenAdr of ASFx09 set to 0x08 or 0x10
- ListenAdrEn of ASFx09 bit set
- psmouse loaded with synaptics_intertouch=1

Only ASFx13 DataBankSel is modified externally. Value is always 0x8?.
I have tried to check Databank?Full and if it set i am calling
i2c_handle_smbus_host_notify and cleaning bit. Sometimes it responds to
cursor move action, sometimes not. Sampling rate varies.

I don't know if this interrupt is host notify. It has some corellation,
but it may be something like bus error or event buffer full. I don't
know.

Here is video demonstration:

https://youtu.be/9pjxyiWA1a8

Before loading psmouse with synaptics_intertouch there are no
interrupts. After unloading, there are again no interrupts.

In ASF documentation is description of ASF_ALRT field of ASF!
description table, but my bios contains only ASFT record of MNVS
OperationRegion. I don't know if i should access this, or something
else.