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Message-ID: <IA1PR11MB60982E0C58F941A9DEF4AA0FF412A@IA1PR11MB6098.namprd11.prod.outlook.com>
Date: Mon, 22 Sep 2025 01:00:57 +0000
From: "Xu, Even" <even.xu@...el.com>
To: "Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>, "Sun, Xinpeng"
<xinpeng.sun@...el.com>, "jikos@...nel.org" <jikos@...nel.org>,
"bentiss@...nel.org" <bentiss@...nel.org>
CC: "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>, "Zhang, Rui1"
<rui1.zhang@...el.com>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 RESEND] hid: intel-thc-hid: intel-quicki2c: support
ACPI config for advanced features
> -----Original Message-----
> From: Pandruvada, Srinivas <srinivas.pandruvada@...el.com>
> Sent: Friday, September 19, 2025 10:20 PM
> To: Sun, Xinpeng <xinpeng.sun@...el.com>; jikos@...nel.org; Xu, Even
> <even.xu@...el.com>; bentiss@...nel.org
> Cc: linux-input@...r.kernel.org; Zhang, Rui1 <rui1.zhang@...el.com>; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH v3 RESEND] hid: intel-thc-hid: intel-quicki2c: support ACPI
> config for advanced features
>
> On Fri, 2025-09-19 at 07:56 +0000, Xu, Even wrote:
> >
> >
> > > -----Original Message-----
> > > From: Sun, Xinpeng <xinpeng.sun@...el.com>
> > > Sent: Wednesday, September 17, 2025 9:54 AM
> > > To: jikos@...nel.org; bentiss@...nel.org
> > > Cc: srinivas.pandruvada@...ux.intel.com;
> > > linux-input@...r.kernel.org; linux-
> > > kernel@...r.kernel.org; Xu, Even <even.xu@...el.com>; Sun, Xinpeng
> > > <xinpeng.sun@...el.com>; Zhang, Rui1 <rui1.zhang@...el.com>
> > > Subject: [PATCH v3 RESEND] hid: intel-thc-hid: intel-quicki2c:
> > > support ACPI config
> > > for advanced features
> > >
> > > There is a new BIOS enhancement that adds the capability to
> > > configure the following two features of I2C subsystem introduced in
> > > commit
> > > 1ed0b48
> > > ("Intel-thc: Introduce max input size control") and commit 3f2a921
> > > ("Intel-thc: Introduce interrupt delay control"):
> > > - Max input size control
> > > - Interrupt delay control
> > >
> > > As BIOS is used for the configuration of these two features, change
> > > driver data usage to indicate hardware capability, and add
> > > corresponding ACPI configuration support in QuickI2C driver.
> > >
> > > Signed-off-by: Xinpeng Sun <xinpeng.sun@...el.com>
> > > Tested-by: Rui Zhang <rui1.zhang@...el.com>
>
> Add your reviewed-by here..
Thanks Srinivas!
Will add review-by this place next time.
Best Regards,
Even Xu
>
> > >
> > > ---
> > > Changes in v3:
> > > - remove unnecessary initialization of local variables Changes in
> > > v2:
> > > - refine the commit message
> > > ---
> > > .../intel-quicki2c/pci-quicki2c.c | 39
> > > +++++++++++++++----
> > > .../intel-quicki2c/quicki2c-dev.h | 24 +++++++++++-
> > > 2 files changed, 53 insertions(+), 10 deletions(-)
> > >
> > > diff --git a/drivers/hid/intel-thc-hid/intel-quicki2c/pci-
> > > quicki2c.c
> > > b/drivers/hid/intel-thc-hid/intel-quicki2c/pci-quicki2c.c
> > > index 854926b3cfd4..3ce5a692b92b 100644
> > > --- a/drivers/hid/intel-thc-hid/intel-quicki2c/pci-quicki2c.c
> > > +++ b/drivers/hid/intel-thc-hid/intel-quicki2c/pci-quicki2c.c
> > > @@ -23,6 +23,7 @@
> > >
> > > static struct quicki2c_ddata ptl_ddata = {
> > > .max_detect_size = MAX_RX_DETECT_SIZE_PTL,
> > > + .max_interrupt_delay = MAX_RX_INTERRUPT_DELAY,
> > > };
> > >
> > > /* THC QuickI2C ACPI method to get device properties */ @@ -200,6
> > > +201,21
> > > @@ static int quicki2c_get_acpi_resources(struct quicki2c_device
> > > *qcdev)
> > > return -EOPNOTSUPP;
> > > }
> > >
> > > + if (qcdev->ddata) {
> > > + qcdev->i2c_max_frame_size_enable =
> > > i2c_config.FSEN;
> > > + qcdev->i2c_int_delay_enable = i2c_config.INDE;
> > > +
> > > + if (i2c_config.FSVL <= qcdev->ddata-
> > > >max_detect_size)
> > > + qcdev->i2c_max_frame_size =
> > > i2c_config.FSVL;
> > > + else
> > > + qcdev->i2c_max_frame_size = qcdev->ddata-
> > > > max_detect_size;
> > > +
> > > + if (i2c_config.INDV <= qcdev->ddata-
> > > >max_interrupt_delay)
> > > + qcdev->i2c_int_delay = i2c_config.INDV;
> > > + else
> > > + qcdev->i2c_int_delay = qcdev->ddata-
> > > > max_interrupt_delay;
> > > + }
> > > +
> > > return 0;
> > > }
> > >
> > > @@ -441,17 +457,24 @@ static void quicki2c_dma_adv_enable(struct
> > > quicki2c_device *qcdev)
> > > * max input length <= THC detect capability, enable the feature
> > > with device
> > > * max input length.
> > > */
> > > - if (qcdev->ddata->max_detect_size >=
> > > - le16_to_cpu(qcdev->dev_desc.max_input_len)) {
> > > - thc_i2c_set_rx_max_size(qcdev->thc_hw,
> > > - le16_to_cpu(qcdev-
> > > > dev_desc.max_input_len));
> > > + if (qcdev->i2c_max_frame_size_enable) {
> > > + if (qcdev->i2c_max_frame_size >=
> > > + le16_to_cpu(qcdev->dev_desc.max_input_len)) {
> > > + thc_i2c_set_rx_max_size(qcdev->thc_hw,
> > > + le16_to_cpu(qcdev-
> > > > dev_desc.max_input_len));
> > > + } else {
> > > + dev_warn(qcdev->dev,
> > > + "Max frame size is smaller than
> > > hid max input
> > > length!");
> > > + thc_i2c_set_rx_max_size(qcdev->thc_hw,
> > > + le16_to_cpu(qcdev-
> > > > i2c_max_frame_size));
> > > + }
> > > thc_i2c_rx_max_size_enable(qcdev->thc_hw, true);
> > > }
> > >
> > > /* If platform supports interrupt delay feature, enable it with
> > > given delay */
> > > - if (qcdev->ddata->interrupt_delay) {
> > > + if (qcdev->i2c_int_delay_enable) {
> > > thc_i2c_set_rx_int_delay(qcdev->thc_hw,
> > > - qcdev->ddata-
> > > >interrupt_delay);
> > > + qcdev->i2c_int_delay *
> > > 10);
> > > thc_i2c_rx_int_delay_enable(qcdev->thc_hw, true);
> > > }
> > > }
> > > @@ -464,10 +487,10 @@ static void quicki2c_dma_adv_enable(struct
> > > quicki2c_device *qcdev)
> > > */
> > > static void quicki2c_dma_adv_disable(struct quicki2c_device
> > > *qcdev) {
> > > - if (qcdev->ddata->max_detect_size)
> > > + if (qcdev->i2c_max_frame_size_enable)
> > > thc_i2c_rx_max_size_enable(qcdev->thc_hw, false);
> > >
> > > - if (qcdev->ddata->interrupt_delay)
> > > + if (qcdev->i2c_int_delay_enable)
> > > thc_i2c_rx_int_delay_enable(qcdev->thc_hw,
> > > false); }
> > >
> > > diff --git a/drivers/hid/intel-thc-hid/intel-quicki2c/quicki2c-
> > > dev.h
> > > b/drivers/hid/intel-thc-hid/intel-quicki2c/quicki2c-dev.h
> > > index d412eafcf9ea..0d423d5dd7a7 100644
> > > --- a/drivers/hid/intel-thc-hid/intel-quicki2c/quicki2c-dev.h
> > > +++ b/drivers/hid/intel-thc-hid/intel-quicki2c/quicki2c-dev.h
> > > @@ -38,6 +38,8 @@
> > >
> > > /* PTL Max packet size detection capability is 255 Bytes */
> > > #define MAX_RX_DETECT_SIZE_PTL 255
> > > +/* Max interrupt delay capability is 2.56ms */
> > > +#define MAX_RX_INTERRUPT_DELAY 256
> > >
> > > /* Default interrupt delay is 1ms, suitable for most devices */
> > > #define DEFAULT_INTERRUPT_DELAY_US (1 *
> > > USEC_PER_MSEC)
> > > @@ -101,6 +103,10 @@ struct quicki2c_subip_acpi_parameter {
> > > * @HMTD: High Speed Mode Plus (3.4Mbits/sec) Serial Data Line
> > > Transmit HOLD Period
> > > * @HMRD: High Speed Mode Plus (3.4Mbits/sec) Serial Data Line
> > > Receive HOLD Period
> > > * @HMSL: Maximum length (in ic_clk_cycles) of suppressed spikes in
> > > High Speed Mode
> > > + * @FSEN: Maximum Frame Size Feature Enable Control
> > > + * @FSVL: Maximum Frame Size Value (unit in Bytes)
> > > + * @INDE: Interrupt Delay Feature Enable Control
> > > + * @INDV: Interrupt Delay Value (unit in 10 us)
> > > *
> > > * Those properties get from QUICKI2C_ACPI_METHOD_NAME_ISUB
> method,
> > > used for
> > > * I2C timing configure.
> > > @@ -127,17 +133,22 @@ struct quicki2c_subip_acpi_config {
> > > u64 HMTD;
> > > u64 HMRD;
> > > u64 HMSL;
> > > +
> > > + u64 FSEN;
> > > + u64 FSVL;
> > > + u64 INDE;
> > > + u64 INDV;
> > > u8 reserved;
> > > };
> > >
> > > /**
> > > * struct quicki2c_ddata - Driver specific data for quicki2c device
> > > * @max_detect_size: Identify max packet size detect for rx
> > > - * @interrupt_delay: Identify interrupt detect delay for rx
> > > + * @interrupt_delay: Identify max interrupt detect delay for rx
> > > */
> > > struct quicki2c_ddata {
> > > u32 max_detect_size;
> > > - u32 interrupt_delay;
> > > + u32 max_interrupt_delay;
> > > };
> > >
> > > struct device;
> > > @@ -170,6 +181,10 @@ struct acpi_device;
> > > * @report_len: The length of input/output report packet
> > > * @reset_ack_wq: Workqueue for waiting reset response from device
> > > * @reset_ack: Indicate reset response received or not
> > > + * @i2c_max_frame_size_enable: Indicate max frame size feature
> > > enabled
> > > + or not
> > > + * @i2c_max_frame_size: Max RX frame size (unit in Bytes)
> > > + * @i2c_int_delay_enable: Indicate interrupt delay feature enabled
> > > or
> > > + not
> > > + * @i2c_int_delay: Interrupt detection delay value (unit in 10 us)
> > > */
> > > struct quicki2c_device {
> > > struct device *dev;
> > > @@ -200,6 +215,11 @@ struct quicki2c_device {
> > >
> > > wait_queue_head_t reset_ack_wq;
> > > bool reset_ack;
> > > +
> > > + u32 i2c_max_frame_size_enable;
> > > + u32 i2c_max_frame_size;
> > > + u32 i2c_int_delay_enable;
> > > + u32 i2c_int_delay;
> > > };
> > >
> >
> > Thanks for the patch!
> >
> > Reviewed-by: Even Xu <even.xu@...el.com>
> >
> > > #endif /* _QUICKI2C_DEV_H_ */
> > > --
> > > 2.40.1
> >
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