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Message-ID: <2334fb1e-fa0c-f883-b6b8-50fe0c4662e7@linux.dev>
Date: Mon, 24 Jul 2023 18:58:37 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Simon Horman <simon.horman@...igine.com>,
Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
Cc: Jakub Kicinski <kuba@...nel.org>, Jiri Pirko <jiri@...nulli.us>,
Jonathan Lemon <jonathan.lemon@...il.com>, Paolo Abeni <pabeni@...hat.com>,
Milena Olech <milena.olech@...el.com>,
Michal Michalik <michal.michalik@...el.com>,
linux-arm-kernel@...ts.infradead.org, poros@...hat.com, mschmidt@...hat.com,
netdev@...r.kernel.org, linux-clk@...r.kernel.org,
Bart Van Assche <bvanassche@....org>
Subject: Re: [PATCH 09/11] ice: implement dpll interface to control cgu
On 24.07.2023 18:41, Simon Horman wrote:
> On Thu, Jul 20, 2023 at 10:19:01AM +0100, Vadim Fedorenko wrote:
>
> ...
>
> Hi Vadim,
>
Hi Simon!
Thanks for the review. I believe Arkadiusz as the author of the patch will
adjust the code accordingly
>> +/**
>> + * ice_dpll_cb_unlock - unlock dplls mutex in callback context
>> + * @pf: private board structure
>> + *
>> + * Unlock the mutex from the callback operations invoked by dpll subsystem.
>> + */
>> +static void ice_dpll_cb_unlock(struct ice_pf *pf)
>> +{
>> + mutex_unlock(&pf->dplls.lock);
>> +}
>> +
>> +/**
>> + * ice_dpll_pin_freq_set - set pin's frequency
>> + * @pf: private board structure
>> + * @pin: pointer to a pin
>> + * @pin_type: type of pin being configured
>> + * @freq: frequency to be set
>> + * @extack: error reporting
>> + *
>> + * Set requested frequency on a pin.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error on AQ or wrong pin type given
>> + */
>> +static int
>> +ice_dpll_pin_freq_set(struct ice_pf *pf, struct ice_dpll_pin *pin,
>> + enum ice_dpll_pin_type pin_type, const u32 freq,
>> + struct netlink_ext_ack *extack)
>> +{
>> + int ret;
>> + u8 flags;
>
> Please arrange local variable declarations for new Networking
> code in reverse xmas tree order - longest line to shortest.
>
>> +
>> + switch (pin_type) {
>> + case ICE_DPLL_PIN_TYPE_INPUT:
>> + flags = ICE_AQC_SET_CGU_IN_CFG_FLG1_UPDATE_FREQ;
>> + ret = ice_aq_set_input_pin_cfg(&pf->hw, pin->idx, flags,
>> + pin->flags[0], freq, 0);
>> + break;
>> + case ICE_DPLL_PIN_TYPE_OUTPUT:
>> + flags = ICE_AQC_SET_CGU_OUT_CFG_UPDATE_FREQ;
>> + ret = ice_aq_set_output_pin_cfg(&pf->hw, pin->idx, flags,
>> + 0, freq, 0);
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> + if (ret) {
>> + NL_SET_ERR_MSG_FMT(extack,
>> + "err:%d %s failed to set pin freq:%u on pin:%u\n",
>> + ret,
>> + ice_aq_str(pf->hw.adminq.sq_last_status),
>> + freq, pin->idx);
>> + return ret;
>> + }
>> + pin->freq = freq;
>> +
>> + return 0;
>> +}
>
> ...
>
>> +/**
>> + * ice_dpll_pin_state_update - update pin's state
>> + * @pf: private board struct
>> + * @pin: structure with pin attributes to be updated
>> + * @pin_type: type of pin being updated
>> + * @extack: error reporting
>> + *
>> + * Determine pin current state and frequency, then update struct
>> + * holding the pin info. For input pin states are separated for each
>> + * dpll, for rclk pins states are separated for each parent.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - OK
>> + * * negative - error
>> + */
>> +int
>> +ice_dpll_pin_state_update(struct ice_pf *pf, struct ice_dpll_pin *pin,
>> + enum ice_dpll_pin_type pin_type,
>> + struct netlink_ext_ack *extack)
>
>> +/**
>> + * ice_dpll_frequency_set - wrapper for pin callback for set frequency
>> + * @pin: pointer to a pin
>> + * @pin_priv: private data pointer passed on pin registration
>> + * @dpll: pointer to dpll
>> + * @dpll_priv: private data pointer passed on dpll registration
>> + * @frequency: frequency to be set
>> + * @extack: error reporting
>> + * @pin_type: type of pin being configured
>> + *
>> + * Wraps internal set frequency command on a pin.
>> + *
>> + * Context: Acquires pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error pin not found or couldn't set in hw
>> + */
>> +static int
>> +ice_dpll_frequency_set(const struct dpll_pin *pin, void *pin_priv,
>> + const struct dpll_device *dpll, void *dpll_priv,
>> + const u32 frequency,
>> + struct netlink_ext_ack *extack,
>> + enum ice_dpll_pin_type pin_type)
>> +{
>> + struct ice_dpll_pin *p = pin_priv;
>> + struct ice_dpll *d = dpll_priv;
>> + struct ice_pf *pf = d->pf;
>> + int ret;
>> +
>> + ret = ice_dpll_cb_lock(pf, extack);
>> + if (ret)
>> + return ret;
>> + ret = ice_dpll_pin_freq_set(pf, p, pin_type, frequency, extack);
>> + ice_dpll_cb_unlock(pf);
>> +
>> + return ret;
>> +}
>> +
>> +/**
>> + * ice_dpll_input_frequency_set - input pin callback for set frequency
>> + * @pin: pointer to a pin
>> + * @pin_priv: private data pointer passed on pin registration
>> + * @dpll: pointer to dpll
>> + * @dpll_priv: private data pointer passed on dpll registration
>> + * @frequency: frequency to be set
>> + * @extack: error reporting
>> + *
>> + * Wraps internal set frequency command on a pin.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error pin not found or couldn't set in hw
>> + */
>> +static int
>> +ice_dpll_input_frequency_set(const struct dpll_pin *pin, void *pin_priv,
>> + const struct dpll_device *dpll, void *dpll_priv,
>> + u64 frequency, struct netlink_ext_ack *extack)
>> +{
>> + return ice_dpll_frequency_set(pin, pin_priv, dpll, dpll_priv, frequency,
>> + extack, ICE_DPLL_PIN_TYPE_INPUT);
>> +}
>> +
>> +/**
>> + * ice_dpll_output_frequency_set - output pin callback for set frequency
>> + * @pin: pointer to a pin
>> + * @pin_priv: private data pointer passed on pin registration
>> + * @dpll: pointer to dpll
>> + * @dpll_priv: private data pointer passed on dpll registration
>> + * @frequency: frequency to be set
>> + * @extack: error reporting
>> + *
>> + * Wraps internal set frequency command on a pin.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error pin not found or couldn't set in hw
>> + */
>> +static int
>> +ice_dpll_output_frequency_set(const struct dpll_pin *pin, void *pin_priv,
>> + const struct dpll_device *dpll, void *dpll_priv,
>> + u64 frequency, struct netlink_ext_ack *extack)
>> +{
>> + return ice_dpll_frequency_set(pin, pin_priv, dpll, dpll_priv, frequency,
>> + extack, ICE_DPLL_PIN_TYPE_OUTPUT);
>> +}
>> +
>> +/**
>> + * ice_dpll_frequency_get - wrapper for pin callback for get frequency
>> + * @pin: pointer to a pin
>> + * @pin_priv: private data pointer passed on pin registration
>> + * @dpll: pointer to dpll
>> + * @dpll_priv: private data pointer passed on dpll registration
>> + * @frequency: on success holds pin's frequency
>> + * @extack: error reporting
>> + * @pin_type: type of pin being configured
>> + *
>> + * Wraps internal get frequency command of a pin.
>> + *
>> + * Context: Acquires pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error pin not found or couldn't get from hw
>> + */
>> +static int
>> +ice_dpll_frequency_get(const struct dpll_pin *pin, void *pin_priv,
>> + const struct dpll_device *dpll, void *dpll_priv,
>> + u64 *frequency, struct netlink_ext_ack *extack,
>> + enum ice_dpll_pin_type pin_type)
>> +{
>> + struct ice_dpll_pin *p = pin_priv;
>> + struct ice_dpll *d = dpll_priv;
>> + struct ice_pf *pf = d->pf;
>> + int ret;
>> +
>> + ret = ice_dpll_cb_lock(pf, extack);
>> + if (ret)
>> + return ret;
>> + *frequency = p->freq;
>> + ice_dpll_cb_unlock(pf);
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * ice_dpll_input_frequency_get - input pin callback for get frequency
>> + * @pin: pointer to a pin
>> + * @pin_priv: private data pointer passed on pin registration
>> + * @dpll: pointer to dpll
>> + * @dpll_priv: private data pointer passed on dpll registration
>> + * @frequency: on success holds pin's frequency
>> + * @extack: error reporting
>> + *
>> + * Wraps internal get frequency command of a input pin.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error pin not found or couldn't get from hw
>> + */
>> +static int
>> +ice_dpll_input_frequency_get(const struct dpll_pin *pin, void *pin_priv,
>> + const struct dpll_device *dpll, void *dpll_priv,
>> + u64 *frequency, struct netlink_ext_ack *extack)
>> +{
>> + return ice_dpll_frequency_get(pin, pin_priv, dpll, dpll_priv, frequency,
>> + extack, ICE_DPLL_PIN_TYPE_INPUT);
>> +}
>> +
>> +/**
>> + * ice_dpll_output_frequency_get - output pin callback for get frequency
>> + * @pin: pointer to a pin
>> + * @pin_priv: private data pointer passed on pin registration
>> + * @dpll: pointer to dpll
>> + * @dpll_priv: private data pointer passed on dpll registration
>> + * @frequency: on success holds pin's frequency
>> + * @extack: error reporting
>> + *
>> + * Wraps internal get frequency command of a pin.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error pin not found or couldn't get from hw
>> + */
>> +static int
>> +ice_dpll_output_frequency_get(const struct dpll_pin *pin, void *pin_priv,
>> + const struct dpll_device *dpll, void *dpll_priv,
>> + u64 *frequency, struct netlink_ext_ack *extack)
>> +{
>> + return ice_dpll_frequency_get(pin, pin_priv, dpll, dpll_priv, frequency,
>> + extack, ICE_DPLL_PIN_TYPE_OUTPUT);
>> +}
>> +
>> +/**
>> + * ice_dpll_pin_enable - enable a pin on dplls
>> + * @hw: board private hw structure
>> + * @pin: pointer to a pin
>> + * @pin_type: type of pin being enabled
>> + * @extack: error reporting
>> + *
>> + * Enable a pin on both dplls. Store current state in pin->flags.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - OK
>> + * * negative - error
>> + */
>> +static int
>> +ice_dpll_pin_enable(struct ice_hw *hw, struct ice_dpll_pin *pin,
>> + enum ice_dpll_pin_type pin_type,
>> + struct netlink_ext_ack *extack)
>> +{
>> + u8 flags = 0;
>> + int ret;
>> +
>> + switch (pin_type) {
>> + case ICE_DPLL_PIN_TYPE_INPUT:
>> + if (pin->flags[0] & ICE_AQC_GET_CGU_IN_CFG_FLG2_ESYNC_EN)
>> + flags |= ICE_AQC_SET_CGU_IN_CFG_FLG2_ESYNC_EN;
>> + flags |= ICE_AQC_SET_CGU_IN_CFG_FLG2_INPUT_EN;
>> + ret = ice_aq_set_input_pin_cfg(hw, pin->idx, 0, flags, 0, 0);
>> + break;
>> + case ICE_DPLL_PIN_TYPE_OUTPUT:
>> + if (pin->flags[0] & ICE_AQC_GET_CGU_OUT_CFG_ESYNC_EN)
>> + flags |= ICE_AQC_SET_CGU_OUT_CFG_ESYNC_EN;
>> + flags |= ICE_AQC_SET_CGU_OUT_CFG_OUT_EN;
>> + ret = ice_aq_set_output_pin_cfg(hw, pin->idx, flags, 0, 0, 0);
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> + if (ret)
>> + NL_SET_ERR_MSG_FMT(extack,
>> + "err:%d %s failed to enable %s pin:%u\n",
>> + ret, ice_aq_str(hw->adminq.sq_last_status),
>> + pin_type_name[pin_type], pin->idx);
>> +
>> + return ret;
>> +}
>> +
>> +/**
>> + * ice_dpll_pin_disable - disable a pin on dplls
>> + * @hw: board private hw structure
>> + * @pin: pointer to a pin
>> + * @pin_type: type of pin being disabled
>> + * @extack: error reporting
>> + *
>> + * Disable a pin on both dplls. Store current state in pin->flags.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - OK
>> + * * negative - error
>> + */
>> +static int
>> +ice_dpll_pin_disable(struct ice_hw *hw, struct ice_dpll_pin *pin,
>> + enum ice_dpll_pin_type pin_type,
>> + struct netlink_ext_ack *extack)
>> +{
>> + u8 flags = 0;
>> + int ret;
>> +
>> + switch (pin_type) {
>> + case ICE_DPLL_PIN_TYPE_INPUT:
>> + if (pin->flags[0] & ICE_AQC_GET_CGU_IN_CFG_FLG2_ESYNC_EN)
>> + flags |= ICE_AQC_SET_CGU_IN_CFG_FLG2_ESYNC_EN;
>> + ret = ice_aq_set_input_pin_cfg(hw, pin->idx, 0, flags, 0, 0);
>> + break;
>> + case ICE_DPLL_PIN_TYPE_OUTPUT:
>> + if (pin->flags[0] & ICE_AQC_GET_CGU_OUT_CFG_ESYNC_EN)
>> + flags |= ICE_AQC_SET_CGU_OUT_CFG_ESYNC_EN;
>> + ret = ice_aq_set_output_pin_cfg(hw, pin->idx, flags, 0, 0, 0);
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> + if (ret)
>> + NL_SET_ERR_MSG_FMT(extack,
>> + "err:%d %s failed to disable %s pin:%u\n",
>> + ret, ice_aq_str(hw->adminq.sq_last_status),
>> + pin_type_name[pin_type], pin->idx);
>> +
>> + return ret;
>> +}
>
>> +/**
>> + * ice_dpll_frequency_set - wrapper for pin callback for set frequency
>> + * @pin: pointer to a pin
>> + * @pin_priv: private data pointer passed on pin registration
>> + * @dpll: pointer to dpll
>> + * @dpll_priv: private data pointer passed on dpll registration
>> + * @frequency: frequency to be set
>> + * @extack: error reporting
>> + * @pin_type: type of pin being configured
>> + *
>> + * Wraps internal set frequency command on a pin.
>> + *
>> + * Context: Acquires pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error pin not found or couldn't set in hw
>> + */
>> +static int
>> +ice_dpll_frequency_set(const struct dpll_pin *pin, void *pin_priv,
>> + const struct dpll_device *dpll, void *dpll_priv,
>> + const u32 frequency,
>> + struct netlink_ext_ack *extack,
>> + enum ice_dpll_pin_type pin_type)
>> +{
>> + struct ice_dpll_pin *p = pin_priv;
>> + struct ice_dpll *d = dpll_priv;
>> + struct ice_pf *pf = d->pf;
>> + int ret;
>> +
>> + ret = ice_dpll_cb_lock(pf, extack);
>> + if (ret)
>> + return ret;
>> + ret = ice_dpll_pin_freq_set(pf, p, pin_type, frequency, extack);
>> + ice_dpll_cb_unlock(pf);
>> +
>> + return ret;
>> +}
>> +
>> +/**
>> + * ice_dpll_input_frequency_set - input pin callback for set frequency
>> + * @pin: pointer to a pin
>> + * @pin_priv: private data pointer passed on pin registration
>> + * @dpll: pointer to dpll
>> + * @dpll_priv: private data pointer passed on dpll registration
>> + * @frequency: frequency to be set
>> + * @extack: error reporting
>> + *
>> + * Wraps internal set frequency command on a pin.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error pin not found or couldn't set in hw
>> + */
>> +static int
>> +ice_dpll_input_frequency_set(const struct dpll_pin *pin, void *pin_priv,
>> + const struct dpll_device *dpll, void *dpll_priv,
>> + u64 frequency, struct netlink_ext_ack *extack)
>> +{
>> + return ice_dpll_frequency_set(pin, pin_priv, dpll, dpll_priv, frequency,
>> + extack, ICE_DPLL_PIN_TYPE_INPUT);
>> +}
>> +
>> +/**
>> + * ice_dpll_output_frequency_set - output pin callback for set frequency
>> + * @pin: pointer to a pin
>> + * @pin_priv: private data pointer passed on pin registration
>> + * @dpll: pointer to dpll
>> + * @dpll_priv: private data pointer passed on dpll registration
>> + * @frequency: frequency to be set
>> + * @extack: error reporting
>> + *
>> + * Wraps internal set frequency command on a pin.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error pin not found or couldn't set in hw
>> + */
>> +static int
>> +ice_dpll_output_frequency_set(const struct dpll_pin *pin, void *pin_priv,
>> + const struct dpll_device *dpll, void *dpll_priv,
>> + u64 frequency, struct netlink_ext_ack *extack)
>> +{
>> + return ice_dpll_frequency_set(pin, pin_priv, dpll, dpll_priv, frequency,
>> + extack, ICE_DPLL_PIN_TYPE_OUTPUT);
>> +}
>> +
>> +/**
>> + * ice_dpll_frequency_get - wrapper for pin callback for get frequency
>> + * @pin: pointer to a pin
>> + * @pin_priv: private data pointer passed on pin registration
>> + * @dpll: pointer to dpll
>> + * @dpll_priv: private data pointer passed on dpll registration
>> + * @frequency: on success holds pin's frequency
>> + * @extack: error reporting
>> + * @pin_type: type of pin being configured
>> + *
>> + * Wraps internal get frequency command of a pin.
>> + *
>> + * Context: Acquires pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error pin not found or couldn't get from hw
>> + */
>> +static int
>> +ice_dpll_frequency_get(const struct dpll_pin *pin, void *pin_priv,
>> + const struct dpll_device *dpll, void *dpll_priv,
>> + u64 *frequency, struct netlink_ext_ack *extack,
>> + enum ice_dpll_pin_type pin_type)
>> +{
>> + struct ice_dpll_pin *p = pin_priv;
>> + struct ice_dpll *d = dpll_priv;
>> + struct ice_pf *pf = d->pf;
>> + int ret;
>> +
>> + ret = ice_dpll_cb_lock(pf, extack);
>> + if (ret)
>> + return ret;
>> + *frequency = p->freq;
>> + ice_dpll_cb_unlock(pf);
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * ice_dpll_input_frequency_get - input pin callback for get frequency
>> + * @pin: pointer to a pin
>> + * @pin_priv: private data pointer passed on pin registration
>> + * @dpll: pointer to dpll
>> + * @dpll_priv: private data pointer passed on dpll registration
>> + * @frequency: on success holds pin's frequency
>> + * @extack: error reporting
>> + *
>> + * Wraps internal get frequency command of a input pin.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error pin not found or couldn't get from hw
>> + */
>> +static int
>> +ice_dpll_input_frequency_get(const struct dpll_pin *pin, void *pin_priv,
>> + const struct dpll_device *dpll, void *dpll_priv,
>> + u64 *frequency, struct netlink_ext_ack *extack)
>> +{
>> + return ice_dpll_frequency_get(pin, pin_priv, dpll, dpll_priv, frequency,
>> + extack, ICE_DPLL_PIN_TYPE_INPUT);
>> +}
>> +
>> +/**
>> + * ice_dpll_output_frequency_get - output pin callback for get frequency
>> + * @pin: pointer to a pin
>> + * @pin_priv: private data pointer passed on pin registration
>> + * @dpll: pointer to dpll
>> + * @dpll_priv: private data pointer passed on dpll registration
>> + * @frequency: on success holds pin's frequency
>> + * @extack: error reporting
>> + *
>> + * Wraps internal get frequency command of a pin.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - error pin not found or couldn't get from hw
>> + */
>> +static int
>> +ice_dpll_output_frequency_get(const struct dpll_pin *pin, void *pin_priv,
>> + const struct dpll_device *dpll, void *dpll_priv,
>> + u64 *frequency, struct netlink_ext_ack *extack)
>> +{
>> + return ice_dpll_frequency_get(pin, pin_priv, dpll, dpll_priv, frequency,
>> + extack, ICE_DPLL_PIN_TYPE_OUTPUT);
>> +}
>> +
>> +/**
>> + * ice_dpll_pin_enable - enable a pin on dplls
>> + * @hw: board private hw structure
>> + * @pin: pointer to a pin
>> + * @pin_type: type of pin being enabled
>> + * @extack: error reporting
>> + *
>> + * Enable a pin on both dplls. Store current state in pin->flags.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - OK
>> + * * negative - error
>> + */
>> +static int
>> +ice_dpll_pin_enable(struct ice_hw *hw, struct ice_dpll_pin *pin,
>> + enum ice_dpll_pin_type pin_type,
>> + struct netlink_ext_ack *extack)
>> +{
>> + u8 flags = 0;
>> + int ret;
>> +
>> + switch (pin_type) {
>> + case ICE_DPLL_PIN_TYPE_INPUT:
>> + if (pin->flags[0] & ICE_AQC_GET_CGU_IN_CFG_FLG2_ESYNC_EN)
>> + flags |= ICE_AQC_SET_CGU_IN_CFG_FLG2_ESYNC_EN;
>> + flags |= ICE_AQC_SET_CGU_IN_CFG_FLG2_INPUT_EN;
>> + ret = ice_aq_set_input_pin_cfg(hw, pin->idx, 0, flags, 0, 0);
>> + break;
>> + case ICE_DPLL_PIN_TYPE_OUTPUT:
>> + if (pin->flags[0] & ICE_AQC_GET_CGU_OUT_CFG_ESYNC_EN)
>> + flags |= ICE_AQC_SET_CGU_OUT_CFG_ESYNC_EN;
>> + flags |= ICE_AQC_SET_CGU_OUT_CFG_OUT_EN;
>> + ret = ice_aq_set_output_pin_cfg(hw, pin->idx, flags, 0, 0, 0);
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> + if (ret)
>> + NL_SET_ERR_MSG_FMT(extack,
>> + "err:%d %s failed to enable %s pin:%u\n",
>> + ret, ice_aq_str(hw->adminq.sq_last_status),
>> + pin_type_name[pin_type], pin->idx);
>> +
>> + return ret;
>> +}
>> +
>> +/**
>> + * ice_dpll_pin_disable - disable a pin on dplls
>> + * @hw: board private hw structure
>> + * @pin: pointer to a pin
>> + * @pin_type: type of pin being disabled
>> + * @extack: error reporting
>> + *
>> + * Disable a pin on both dplls. Store current state in pin->flags.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - OK
>> + * * negative - error
>> + */
>> +static int
>> +ice_dpll_pin_disable(struct ice_hw *hw, struct ice_dpll_pin *pin,
>> + enum ice_dpll_pin_type pin_type,
>> + struct netlink_ext_ack *extack)
>> +{
>> + u8 flags = 0;
>> + int ret;
>> +
>> + switch (pin_type) {
>> + case ICE_DPLL_PIN_TYPE_INPUT:
>> + if (pin->flags[0] & ICE_AQC_GET_CGU_IN_CFG_FLG2_ESYNC_EN)
>> + flags |= ICE_AQC_SET_CGU_IN_CFG_FLG2_ESYNC_EN;
>> + ret = ice_aq_set_input_pin_cfg(hw, pin->idx, 0, flags, 0, 0);
>> + break;
>> + case ICE_DPLL_PIN_TYPE_OUTPUT:
>> + if (pin->flags[0] & ICE_AQC_GET_CGU_OUT_CFG_ESYNC_EN)
>> + flags |= ICE_AQC_SET_CGU_OUT_CFG_ESYNC_EN;
>> + ret = ice_aq_set_output_pin_cfg(hw, pin->idx, flags, 0, 0, 0);
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> + if (ret)
>> + NL_SET_ERR_MSG_FMT(extack,
>> + "err:%d %s failed to disable %s pin:%u\n",
>> + ret, ice_aq_str(hw->adminq.sq_last_status),
>> + pin_type_name[pin_type], pin->idx);
>> +
>> + return ret;
>> +}
>
> Should this function be static?
>
>> +{
>> + int ret;
>> +
>> + switch (pin_type) {
>> + case ICE_DPLL_PIN_TYPE_INPUT:
>> + ret = ice_aq_get_input_pin_cfg(&pf->hw, pin->idx, NULL, NULL,
>> + NULL, &pin->flags[0],
>> + &pin->freq, NULL);
>> + if (ret)
>> + goto err;
>> + if (ICE_AQC_GET_CGU_IN_CFG_FLG2_INPUT_EN & pin->flags[0]) {
>> + if (pin->pin) {
>> + pin->state[pf->dplls.eec.dpll_idx] =
>> + pin->pin == pf->dplls.eec.active_input ?
>> + DPLL_PIN_STATE_CONNECTED :
>> + DPLL_PIN_STATE_SELECTABLE;
>> + pin->state[pf->dplls.pps.dpll_idx] =
>> + pin->pin == pf->dplls.pps.active_input ?
>> + DPLL_PIN_STATE_CONNECTED :
>> + DPLL_PIN_STATE_SELECTABLE;
>> + } else {
>> + pin->state[pf->dplls.eec.dpll_idx] =
>> + DPLL_PIN_STATE_SELECTABLE;
>> + pin->state[pf->dplls.pps.dpll_idx] =
>> + DPLL_PIN_STATE_SELECTABLE;
>> + }
>> + } else {
>> + pin->state[pf->dplls.eec.dpll_idx] =
>> + DPLL_PIN_STATE_DISCONNECTED;
>> + pin->state[pf->dplls.pps.dpll_idx] =
>> + DPLL_PIN_STATE_DISCONNECTED;
>> + }
>> + break;
>> + case ICE_DPLL_PIN_TYPE_OUTPUT:
>> + ret = ice_aq_get_output_pin_cfg(&pf->hw, pin->idx,
>> + &pin->flags[0], NULL,
>> + &pin->freq, NULL);
>> + if (ret)
>> + goto err;
>> + if (ICE_AQC_SET_CGU_OUT_CFG_OUT_EN & pin->flags[0])
>> + pin->state[0] = DPLL_PIN_STATE_CONNECTED;
>> + else
>> + pin->state[0] = DPLL_PIN_STATE_DISCONNECTED;
>> + break;
>> + case ICE_DPLL_PIN_TYPE_RCLK_INPUT:
>
> clang-16 complains that:
>
> drivers/net/ethernet/intel/ice/ice_dpll.c:461:3: error: expected expression
> u8 parent, port_num = ICE_AQC_SET_PHY_REC_CLK_OUT_CURR_PORT;
>
> Which, I think means, it wants this case to be enclosed in { }
>
>> + u8 parent, port_num = ICE_AQC_SET_PHY_REC_CLK_OUT_CURR_PORT;
>> +
>> + for (parent = 0; parent < pf->dplls.rclk.num_parents;
>> + parent++) {
>> + u8 p = parent;
>> +
>> + ret = ice_aq_get_phy_rec_clk_out(&pf->hw, &p,
>> + &port_num,
>> + &pin->flags[parent],
>> + NULL);
>> + if (ret)
>> + goto err;
>> + if (ICE_AQC_GET_PHY_REC_CLK_OUT_OUT_EN &
>> + pin->flags[parent])
>> + pin->state[parent] = DPLL_PIN_STATE_CONNECTED;
>> + else
>> + pin->state[parent] =
>> + DPLL_PIN_STATE_DISCONNECTED;
>> + }
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + return 0;
>> +err:
>> + if (extack)
>> + NL_SET_ERR_MSG_FMT(extack,
>> + "err:%d %s failed to update %s pin:%u\n",
>> + ret,
>> + ice_aq_str(pf->hw.adminq.sq_last_status),
>> + pin_type_name[pin_type], pin->idx);
>> + else
>> + dev_err_ratelimited(ice_pf_to_dev(pf),
>> + "err:%d %s failed to update %s pin:%u\n",
>> + ret,
>> + ice_aq_str(pf->hw.adminq.sq_last_status),
>> + pin_type_name[pin_type], pin->idx);
>> + return ret;
>> +}
>
> ...
>
>> +/**
>> + * ice_dpll_update_state - update dpll state
>> + * @pf: pf private structure
>> + * @d: pointer to queried dpll device
>> + * @init: if function called on initialization of ice dpll
>> + *
>> + * Poll current state of dpll from hw and update ice_dpll struct.
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - AQ failure
>> + */
>> +static int
>> +ice_dpll_update_state(struct ice_pf *pf, struct ice_dpll *d, bool init)
>> +{
>> + struct ice_dpll_pin *p = NULL;
>> + int ret;
>> +
>> + ret = ice_get_cgu_state(&pf->hw, d->dpll_idx, d->prev_dpll_state,
>> + &d->input_idx, &d->ref_state, &d->eec_mode,
>> + &d->phase_shift, &d->dpll_state, &d->mode);
>> +
>> + dev_dbg(ice_pf_to_dev(pf),
>> + "update dpll=%d, prev_src_idx:%u, src_idx:%u, state:%d, prev:%d mode:%d\n",
>> + d->dpll_idx, d->prev_input_idx, d->input_idx,
>> + d->dpll_state, d->prev_dpll_state, d->mode);
>> + if (ret) {
>> + dev_err(ice_pf_to_dev(pf),
>> + "update dpll=%d state failed, ret=%d %s\n",
>> + d->dpll_idx, ret,
>> + ice_aq_str(pf->hw.adminq.sq_last_status));
>> + return ret;
>> + }
>> + if (init) {
>> + if (d->dpll_state == DPLL_LOCK_STATUS_LOCKED &&
>> + d->dpll_state == DPLL_LOCK_STATUS_LOCKED_HO_ACQ)
>
> Should this be '||' rather than '&&' ?
>
> Flagged by a clang-16 W=1 build, Sparse and Smatch.
>
>> + d->active_input = pf->dplls.inputs[d->input_idx].pin;
>> + p = &pf->dplls.inputs[d->input_idx];
>> + return ice_dpll_pin_state_update(pf, p,
>> + ICE_DPLL_PIN_TYPE_INPUT, NULL);
>> + }
>
> ...
>
>> +/**
>> + * ice_dpll_init_info_direct_pins - initializes direct pins info
>> + * @pf: board private structure
>> + * @pin_type: type of pins being initialized
>> + *
>> + * Init information for directly connected pins, cache them in pf's pins
>> + * structures.
>> + *
>> + * Context: Called under pf->dplls.lock.
>> + * Return:
>> + * * 0 - success
>> + * * negative - init failure reason
>> + */
>> +static int
>> +ice_dpll_init_info_direct_pins(struct ice_pf *pf,
>> + enum ice_dpll_pin_type pin_type)
>> +{
>> + struct ice_dpll *de = &pf->dplls.eec, *dp = &pf->dplls.pps;
>> + struct ice_hw *hw = &pf->hw;
>> + struct ice_dpll_pin *pins;
>> + int num_pins, i, ret;
>> + u8 freq_supp_num;
>> + bool input;
>> +
>> + switch (pin_type) {
>> + case ICE_DPLL_PIN_TYPE_INPUT:
>> + pins = pf->dplls.inputs;
>> + num_pins = pf->dplls.num_inputs;
>> + input = true;
>> + break;
>> + case ICE_DPLL_PIN_TYPE_OUTPUT:
>> + pins = pf->dplls.outputs;
>> + num_pins = pf->dplls.num_outputs;
>> + input = false;
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + for (i = 0; i < num_pins; i++) {
>> + pins[i].idx = i;
>> + pins[i].prop.board_label = ice_cgu_get_pin_name(hw, i, input);
>> + pins[i].prop.type = ice_cgu_get_pin_type(hw, i, input);
>> + if (input) {
>> + ret = ice_aq_get_cgu_ref_prio(hw, de->dpll_idx, i,
>> + &de->input_prio[i]);
>> + if (ret)
>> + return ret;
>> + ret = ice_aq_get_cgu_ref_prio(hw, dp->dpll_idx, i,
>> + &dp->input_prio[i]);
>> + if (ret)
>> + return ret;
>> + pins[i].prop.capabilities |=
>> + DPLL_PIN_CAPS_PRIORITY_CAN_CHANGE;
>> + }
>> + pins[i].prop.capabilities |= DPLL_PIN_CAPS_STATE_CAN_CHANGE;
>> + ret = ice_dpll_pin_state_update(pf, &pins[i], pin_type, NULL);
>> + if (ret)
>> + return ret;
>> + pins[i].prop.freq_supported =
>> + ice_cgu_get_pin_freq_supp(hw, i, input, &freq_supp_num);
>> + pins[i].prop.freq_supported_num = freq_supp_num;
>> + pins[i].pf = pf;
>> + }
>> +
>
> I'm unsure if this can happen,
> but if the for loop above iterates zero times
> then ret will be null here.
>
> Use of uninitialised variable flagged by Smatch.
>
>> + return ret;
>> +}
>
> ...
>
>> +/**
>> + * ice_dpll_init_info - prepare pf's dpll information structure
>> + * @pf: board private structure
>> + * @cgu: if cgu is present and controlled by this NIC
>> + *
>> + * Acquire (from HW) and set basic dpll information (on pf->dplls struct).
>> + *
>> + * Context: Called under pf->dplls.lock
>> + * Return:
>> + * * 0 - success
>> + * * negative - init failure reason
>> + */
>> +static int ice_dpll_init_info(struct ice_pf *pf, bool cgu)
>> +{
>> + struct ice_aqc_get_cgu_abilities abilities;
>> + struct ice_dpll *de = &pf->dplls.eec;
>> + struct ice_dpll *dp = &pf->dplls.pps;
>> + struct ice_dplls *d = &pf->dplls;
>> + struct ice_hw *hw = &pf->hw;
>> + int ret, alloc_size, i;
>> +
>> + d->clock_id = ice_generate_clock_id(pf);
>> + ret = ice_aq_get_cgu_abilities(hw, &abilities);
>> + if (ret) {
>> + dev_err(ice_pf_to_dev(pf),
>> + "err:%d %s failed to read cgu abilities\n",
>> + ret, ice_aq_str(hw->adminq.sq_last_status));
>> + return ret;
>> + }
>> +
>> + de->dpll_idx = abilities.eec_dpll_idx;
>> + dp->dpll_idx = abilities.pps_dpll_idx;
>> + d->num_inputs = abilities.num_inputs;
>> + d->num_outputs = abilities.num_outputs;
>> + d->input_phase_adj_max = le32_to_cpu(abilities.max_in_phase_adj);
>> + d->output_phase_adj_max = le32_to_cpu(abilities.max_out_phase_adj);
>> +
>> + alloc_size = sizeof(*d->inputs) * d->num_inputs;
>> + d->inputs = kzalloc(alloc_size, GFP_KERNEL);
>> + if (!d->inputs)
>> + return -ENOMEM;
>> +
>> + alloc_size = sizeof(*de->input_prio) * d->num_inputs;
>> + de->input_prio = kzalloc(alloc_size, GFP_KERNEL);
>> + if (!de->input_prio)
>> + return -ENOMEM;
>> +
>> + dp->input_prio = kzalloc(alloc_size, GFP_KERNEL);
>> + if (!dp->input_prio)
>> + return -ENOMEM;
>> +
>> + ret = ice_dpll_init_pins_info(pf, ICE_DPLL_PIN_TYPE_INPUT);
>> + if (ret)
>> + goto deinit_info;
>> +
>> + if (cgu) {
>> + alloc_size = sizeof(*d->outputs) * d->num_outputs;
>> + d->outputs = kzalloc(alloc_size, GFP_KERNEL);
>> + if (!d->outputs)
>
> Should ret be set to -ENOMEM here?
>
> Flagged by Smatch.
>
>> + goto deinit_info;
>> +
>> + ret = ice_dpll_init_pins_info(pf, ICE_DPLL_PIN_TYPE_OUTPUT);
>> + if (ret)
>> + goto deinit_info;
>> + }
>> +
>> + ret = ice_get_cgu_rclk_pin_info(&pf->hw, &d->base_rclk_idx,
>> + &pf->dplls.rclk.num_parents);
>> + if (ret)
>> + return ret;
>> + for (i = 0; i < pf->dplls.rclk.num_parents; i++)
>> + pf->dplls.rclk.parent_idx[i] = d->base_rclk_idx + i;
>> + ret = ice_dpll_init_pins_info(pf, ICE_DPLL_PIN_TYPE_RCLK_INPUT);
>> + if (ret)
>> + return ret;
>> + de->mode = DPLL_MODE_AUTOMATIC;
>> + dp->mode = DPLL_MODE_AUTOMATIC;
>> +
>> + dev_dbg(ice_pf_to_dev(pf),
>> + "%s - success, inputs:%u, outputs:%u rclk-parents:%u\n",
>> + __func__, d->num_inputs, d->num_outputs, d->rclk.num_parents);
>> +
>> + return 0;
>> +
>> +deinit_info:
>> + dev_err(ice_pf_to_dev(pf),
>> + "%s - fail: d->inputs:%p, de->input_prio:%p, dp->input_prio:%p, d->outputs:%p\n",
>> + __func__, d->inputs, de->input_prio,
>> + dp->input_prio, d->outputs);
>> + ice_dpll_deinit_info(pf);
>> + return ret;
>> +}
>
> ...
>
>> +/**
>> + * ice_dpll_init - initialize support for dpll subsystem
>> + * @pf: board private structure
>> + *
>> + * Set up the device dplls, register them and pins connected within Linux dpll
>> + * subsystem. Allow userpsace to obtain state of DPLL and handling of DPLL
>
> nit: userpsace -> userspace
>
>> + * configuration requests.
>> + *
>> + * Context: Function initializes and holds pf->dplls.lock mutex.
>> + */
>
> ...
>
>> diff --git a/drivers/net/ethernet/intel/ice/ice_dpll.h b/drivers/net/ethernet/intel/ice/ice_dpll.h
>> new file mode 100644
>> index 000000000000..975066b71c5e
>> --- /dev/null
>> +++ b/drivers/net/ethernet/intel/ice/ice_dpll.h
>> @@ -0,0 +1,104 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/* Copyright (C) 2022, Intel Corporation. */
>> +
>> +#ifndef _ICE_DPLL_H_
>> +#define _ICE_DPLL_H_
>> +
>> +#include "ice.h"
>> +
>> +#define ICE_DPLL_PRIO_MAX 0xF
>> +#define ICE_DPLL_RCLK_NUM_MAX 4
>> +
>> +/** ice_dpll_pin - store info about pins
>> + * @pin: dpll pin structure
>> + * @pf: pointer to pf, which has registered the dpll_pin
>> + * @idx: ice pin private idx
>> + * @num_parents: hols number of parent pins
>> + * @parent_idx: hold indexes of parent pins
>> + * @flags: pin flags returned from HW
>> + * @state: state of a pin
>> + * @prop: pin properities
>
> nit: properities -> properties
>
>> + * @freq: current frequency of a pin
>> + */
>> +struct ice_dpll_pin {
>> + struct dpll_pin *pin;
>> + struct ice_pf *pf;
>> + u8 idx;
>> + u8 num_parents;
>> + u8 parent_idx[ICE_DPLL_RCLK_NUM_MAX];
>> + u8 flags[ICE_DPLL_RCLK_NUM_MAX];
>> + u8 state[ICE_DPLL_RCLK_NUM_MAX];
>> + struct dpll_pin_properties prop;
>> + u32 freq;
>> +};
>
> ...
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