Re: [PATCH 0/4] Add LVTS support for mt8192

[Balsam CHIHI <bchihi@baylibre.com>]

On Tue, Apr 25, 2023 at 12:21 AM Nícolas F. R. A. Prado
<nfraprado@collabora.com> wrote:
>
> On Tue, Mar 28, 2023 at 02:20:24AM +0200, Balsam CHIHI wrote:
> > On Sat, Mar 25, 2023 at 5:33 AM Chen-Yu Tsai <wenst@chromium.org> wrote:
> > >
> > > On Wed, Mar 22, 2023 at 8:48 PM Balsam CHIHI <bchihi@baylibre.com> wrote:
> > > >
> > > > Hi Chen-Yu,
> > > >
> > > > I suspect the bug comes from incorrect calibration data offsets for AP
> > > > Domain because you confirm that MCU Domain probe runs without issues.
> > > > Is it possible to test something for us to confirm this theory (i
> > > > don't have an mt8192 board on hand now), when you have the time of
> > > > course?
> > > > We would like to test AP Domain's calibration data offsets with a
> > > > working one, for example :
> > > >
> > > >  static const struct lvts_ctrl_data mt8192_lvts_ap_data_ctrl[] = {
> > > >                 {
> > > > -               .cal_offset = { 0x25, 0x28 },
> > > > +               .cal_offset = { 0x04, 0x04 },
> > > >                 .lvts_sensor = {
> > > >                         { .dt_id = MT8192_AP_VPU0 },
> > > >                         { .dt_id = MT8192_AP_VPU1 }
> > > > @@ -1336,7 +1336,7 @@ static const struct lvts_ctrl_data
> [..]
> > > >
> > > > This example is tested and works for mt8195,
> > > > (all sensors use the same calibration data offset for testing purposes).
> > > >
> > > > Thank you in advance for your help.
> > >
> > > The MCU ones are still tripping though. If I change all of them to 0x04,
> > > then nothing trips. There's also a bug in the interrupt handling code
> > > that needs to be dealt with.
> > >
> > > AFAICT the calibration data is stored differently. If you look at ChromeOS's
> > > downstream v5.10 driver, you'll see mt6873_efuse_to_cal_data() for MT8192,
> > > and mt8195_efuse_to_cal_data() for MT8195. The difference sums up to:
> > > MT8195 has all data sequentially stored, while MT8192 has most data stored
> > > in lower 24 bits of each 32-bit word, and the highest 8 bits are then used
> > > to pack data for the remaining sensors.
> > >
> > > Regards
> > > ChenYu
> >
> > Hi Chen-Yu Tsai,
> >
> > Thank you very much for helping me testing this suggestion.
> >
> > Indeed, calibration data is stored differently in the mt8192 compared to mt8195.
> > So, the mt8192's support will be delayed for now, to allow further debugging.
> >
> > In the mean time, we will only continue to upstream the remaining
> > mt8195's source code, so it will get full LVTS support.
> > A new series will be submitted soon.
>
> Hi Balsam,
>
> like Chen-Yu mentioned, the calibration data is stored with 4 byte alignment for
> MT8192, but the data that is split between non-contiguous bytes is for the
> thermal controllers (called Resistor-Capacitor Calibration downstream) not the
> sensors. The controller calibration isn't currently handled in this driver (and
> downstream it also isn't used, since a current value is read from the controller
> instead), so we can just ignore those.
>
> The patch below adjusts the addresseses for the sensors and gives me reasonable
> reads, so the machine no longer reboots. Can you integrate it into your series?
>
> Thanks,
> Nícolas
>

Hello Nícolas,

Thank you very much for your help!
I really appreciate it.
Yes, of course I will integrate your fix to the series immediately.

Best regards,
Balsam

> From 4506f03b806f3eeb89887bac2c1c86d61da97281 Mon Sep 17 00:00:00 2001
> From: =?UTF-8?q?N=C3=ADcolas=20F=2E=20R=2E=20A=2E=20Prado?=
>  <nfraprado@collabora.com>
> Date: Mon, 24 Apr 2023 17:42:42 -0400
> Subject: [PATCH] thermal/drivers/mediatek/lvts_thermal: Fix calibration
>  offsets for MT8192
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
>
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
> ---
>  drivers/thermal/mediatek/lvts_thermal.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c
> index b6956c89d557..f8afbc2ac190 100644
> --- a/drivers/thermal/mediatek/lvts_thermal.c
> +++ b/drivers/thermal/mediatek/lvts_thermal.c
> @@ -1261,7 +1261,7 @@ static const struct lvts_ctrl_data mt8195_lvts_ap_data_ctrl[] = {
>
>  static const struct lvts_ctrl_data mt8192_lvts_mcu_data_ctrl[] = {
>         {
> -               .cal_offset = { 0x04, 0x07 },
> +               .cal_offset = { 0x04, 0x08 },
>                 .lvts_sensor = {
>                         { .dt_id = MT8192_MCU_BIG_CPU0 },
>                         { .dt_id = MT8192_MCU_BIG_CPU1 }
> @@ -1271,7 +1271,7 @@ static const struct lvts_ctrl_data mt8192_lvts_mcu_data_ctrl[] = {
>                 .hw_tshut_temp = LVTS_HW_SHUTDOWN_MT8192,
>         },
>         {
> -               .cal_offset = { 0x0d, 0x10 },
> +               .cal_offset = { 0x0c, 0x10 },
>                 .lvts_sensor = {
>                         { .dt_id = MT8192_MCU_BIG_CPU2 },
>                         { .dt_id = MT8192_MCU_BIG_CPU3 }
> @@ -1281,7 +1281,7 @@ static const struct lvts_ctrl_data mt8192_lvts_mcu_data_ctrl[] = {
>                 .hw_tshut_temp = LVTS_HW_SHUTDOWN_MT8192,
>         },
>         {
> -               .cal_offset = { 0x16, 0x19, 0x1c, 0x1f },
> +               .cal_offset = { 0x14, 0x18, 0x1c, 0x20 },
>                 .lvts_sensor = {
>                         { .dt_id = MT8192_MCU_LITTLE_CPU0 },
>                         { .dt_id = MT8192_MCU_LITTLE_CPU1 },
> @@ -1296,7 +1296,7 @@ static const struct lvts_ctrl_data mt8192_lvts_mcu_data_ctrl[] = {
>
>  static const struct lvts_ctrl_data mt8192_lvts_ap_data_ctrl[] = {
>                 {
> -               .cal_offset = { 0x25, 0x28 },
> +               .cal_offset = { 0x24, 0x28 },
>                 .lvts_sensor = {
>                         { .dt_id = MT8192_AP_VPU0 },
>                         { .dt_id = MT8192_AP_VPU1 }
> @@ -1306,7 +1306,7 @@ static const struct lvts_ctrl_data mt8192_lvts_ap_data_ctrl[] = {
>                 .hw_tshut_temp = LVTS_HW_SHUTDOWN_MT8192,
>         },
>         {
> -               .cal_offset = { 0x2e, 0x31 },
> +               .cal_offset = { 0x2c, 0x30 },
>                 .lvts_sensor = {
>                         { .dt_id = MT8192_AP_GPU0 },
>                         { .dt_id = MT8192_AP_GPU1 }
> @@ -1316,7 +1316,7 @@ static const struct lvts_ctrl_data mt8192_lvts_ap_data_ctrl[] = {
>                 .hw_tshut_temp = LVTS_HW_SHUTDOWN_MT8192,
>         },
>         {
> -               .cal_offset = { 0x37, 0x3a },
> +               .cal_offset = { 0x34, 0x38 },
>                 .lvts_sensor = {
>                         { .dt_id = MT8192_AP_INFRA },
>                         { .dt_id = MT8192_AP_CAM },
> @@ -1326,7 +1326,7 @@ static const struct lvts_ctrl_data mt8192_lvts_ap_data_ctrl[] = {
>                 .hw_tshut_temp = LVTS_HW_SHUTDOWN_MT8192,
>         },
>         {
> -               .cal_offset = { 0x40, 0x43, 0x46 },
> +               .cal_offset = { 0x3c, 0x40, 0x44 },
>                 .lvts_sensor = {
>                         { .dt_id = MT8192_AP_MD0 },
>                         { .dt_id = MT8192_AP_MD1 },
> --
> 2.40.0