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Message-ID: <395082002847970ff3234b5b12175280d9117275.camel@intel.com>
Date: Fri, 19 Sep 2025 14:20:06 +0000
From: "Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>
To: "Sun, Xinpeng" <xinpeng.sun@...el.com>, "jikos@...nel.org"
<jikos@...nel.org>, "Xu, Even" <even.xu@...el.com>, "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
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..
> >
> > ---
> > 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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