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Message-ID: <CAGp9LzqB+2DvbGccYchH+ugyEN5RQMvAwrG9cY7pHDPh=u8FOA@mail.gmail.com>
Date: Fri, 27 Sep 2019 10:51:27 -0700
From: Sean Wang <sean.wang@...nel.org>
To: Light Hsieh <light.hsieh@...iatek.com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>,
"open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
lkml <linux-kernel@...r.kernel.org>, kuohong.wang@...iatek.com
Subject: Re: [PATCH v6 3/5] pinctrl: mediatek: Refine mtk_pinconf_get() and mtk_pinconf_set()
Hi,
On Thu, Sep 26, 2019 at 10:02 PM Light Hsieh <light.hsieh@...iatek.com> wrote:
>
> 1.Refine mtk_pinconf_get():
> 1.1 Use only one occurrence of return at end of this function.
> 1.2 Correct cases for PIN_CONFIG_SLEW_RATE, PIN_CONFIG_INPUT_SCHMITT_ENABLE,
If you want to fix it a bug, you should submit a separate patch for
that and don't mix fixups and improvements in one.
> and PIN_CONFIG_OUTPUT_ENABLE -
> Use variable ret to receive value in mtk_hw_get_value() (instead of
> variable val) since pinconf_to_config_packed() at end of this function
> use variable ret to pack config value.
Is that a fixup or an improvement?
>
> 2.Refine mtk_pinconf_set():
> 2.1 Use only one occurrence of return at end of this function.
> 2.2 Modify case of PIN_CONFIG_INPUT_ENABLE -
> Remove check of ies_present flag and always invoke mtk_hw_set_value()
> since mtk_hw_pin_field_lookup() invoked inside mtk_hw_set_value() has
> the same effect of checking if ies control is supported.
> [The rationale is that: available of a control is always checked
> in mtk_hw_pin_field_lookup() and no need to add ies_present flag
> specially for ies control.]
> 2.3 Simply code logic for case of PIN_CONFIG_INPUT_SCHMITT.
> 2.4 Add case for PIN_CONFIG_INPUT_SCHMITT_ENABLE and process it with the
> same code for case of PIN_CONFIG_INPUT_SCHMITT.
Remember that one patch only does one thing so that please split the
patch you proposed here to smaller patches in the appropriate group
which are pointed out by that is either a fixup and an improvement.
>
There are many missing tags
> ---
> drivers/pinctrl/mediatek/pinctrl-mt6765.c | 1 -
> drivers/pinctrl/mediatek/pinctrl-paris.c | 211 +++++++++++-------------------
> 2 files changed, 79 insertions(+), 133 deletions(-)
>
> diff --git a/drivers/pinctrl/mediatek/pinctrl-mt6765.c b/drivers/pinctrl/mediatek/pinctrl-mt6765.c
> index e024ebc..bada37f 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mt6765.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-mt6765.c
> @@ -1070,7 +1070,6 @@
> .ngrps = ARRAY_SIZE(mtk_pins_mt6765),
> .eint_hw = &mt6765_eint_hw,
> .gpio_m = 0,
> - .ies_present = true,
> .base_names = mt6765_pinctrl_register_base_names,
> .nbase_names = ARRAY_SIZE(mt6765_pinctrl_register_base_names),
> .bias_disable_set = mtk_pinconf_bias_disable_set,
> diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
> index 5217f76..54f069b 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-paris.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
> @@ -78,95 +78,79 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
> {
> struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
> u32 param = pinconf_to_config_param(*config);
> - int val, val2, err, reg, ret = 1;
> + int err, reg, ret = 1;
> const struct mtk_pin_desc *desc;
>
> - if (pin >= hw->soc->npins)
> - return -EINVAL;
> + if (pin >= hw->soc->npins) {
> + err = -EINVAL;
> + goto out;
> + }
> desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
>
> switch (param) {
> case PIN_CONFIG_BIAS_DISABLE:
> - if (hw->soc->bias_disable_get) {
> + if (hw->soc->bias_disable_get)
> err = hw->soc->bias_disable_get(hw, desc, &ret);
> - if (err)
> - return err;
> - } else {
> - return -ENOTSUPP;
> - }
> + else
> + err = -ENOTSUPP;
> break;
> case PIN_CONFIG_BIAS_PULL_UP:
> - if (hw->soc->bias_get) {
> + if (hw->soc->bias_get)
> err = hw->soc->bias_get(hw, desc, 1, &ret);
> - if (err)
> - return err;
> - } else {
> - return -ENOTSUPP;
> - }
> + else
> + err = -ENOTSUPP;
> break;
> case PIN_CONFIG_BIAS_PULL_DOWN:
> - if (hw->soc->bias_get) {
> + if (hw->soc->bias_get)
> err = hw->soc->bias_get(hw, desc, 0, &ret);
> - if (err)
> - return err;
> - } else {
> - return -ENOTSUPP;
> - }
> + else
> + err = -ENOTSUPP;
> break;
> case PIN_CONFIG_SLEW_RATE:
> - err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SR, &val);
> - if (err)
> - return err;
> -
> - if (!val)
> - return -EINVAL;
> -
> + err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SR, &ret);
> break;
> case PIN_CONFIG_INPUT_ENABLE:
> case PIN_CONFIG_OUTPUT_ENABLE:
> - err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &val);
> + err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &ret);
> if (err)
> - return err;
> -
> - /* HW takes input mode as zero; output mode as non-zero */
> - if ((val && param == PIN_CONFIG_INPUT_ENABLE) ||
> - (!val && param == PIN_CONFIG_OUTPUT_ENABLE))
> - return -EINVAL;
> + goto out;
> + /* CONFIG Current direction return value
> + * ------------- ----------------- ----------------------
> + * OUTPUT_ENABLE output 1 (= HW value)
> + * input 0 (= HW value)
> + * INPUT_ENABLE output 0 (= reverse HW value)
> + * input 1 (= reverse HW value)
> + */
> + if (param == PIN_CONFIG_INPUT_ENABLE)
> + ret = !ret;
>
> break;
> case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
> - err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &val);
> - if (err)
> - return err;
> -
> - err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SMT, &val2);
> + err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &ret);
> if (err)
> - return err;
> + goto out;
> + /* return error when in output mode
> + * because schmitt trigger only work in input mode
> + */
> + if (ret) {
> + err = -EINVAL;
> + goto out;
> + }
>
> - if (val || !val2)
> - return -EINVAL;
> + err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SMT, &ret);
>
> break;
> case PIN_CONFIG_DRIVE_STRENGTH:
> - if (hw->soc->drive_get) {
> + if (hw->soc->drive_get)
> err = hw->soc->drive_get(hw, desc, &ret);
> - if (err)
> - return err;
> - } else {
> + else
> err = -ENOTSUPP;
> - }
> break;
> case MTK_PIN_CONFIG_TDSEL:
> case MTK_PIN_CONFIG_RDSEL:
> reg = (param == MTK_PIN_CONFIG_TDSEL) ?
> PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL;
> -
> - err = mtk_hw_get_value(hw, desc, reg, &val);
> - if (err)
> - return err;
> -
> - ret = val;
> -
> + err = mtk_hw_get_value(hw, desc, reg, &ret);
> break;
> case MTK_PIN_CONFIG_PU_ADV:
> case MTK_PIN_CONFIG_PD_ADV:
> @@ -175,28 +159,24 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
>
> pullup = param == MTK_PIN_CONFIG_PU_ADV;
> err = hw->soc->adv_pull_get(hw, desc, pullup, &ret);
> - if (err)
> - return err;
> - } else {
> - return -ENOTSUPP;
> - }
> + } else
> + err = -ENOTSUPP;
> break;
> case MTK_PIN_CONFIG_DRV_ADV:
> - if (hw->soc->adv_drive_get) {
> + if (hw->soc->adv_drive_get)
> err = hw->soc->adv_drive_get(hw, desc, &ret);
> - if (err)
> - return err;
> - } else {
> - return -ENOTSUPP;
> - }
> + else
> + err = -ENOTSUPP;
> break;
> default:
> - return -ENOTSUPP;
> + err = -ENOTSUPP;
> }
>
> - *config = pinconf_to_config_packed(param, ret);
> +out:
> + if (!err)
> + *config = pinconf_to_config_packed(param, ret);
>
> - return 0;
> + return err;
> }
>
> static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
> @@ -216,60 +196,45 @@ static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
>
> switch ((u32)param) {
> case PIN_CONFIG_BIAS_DISABLE:
> - if (hw->soc->bias_disable_set) {
> + if (hw->soc->bias_disable_set)
> err = hw->soc->bias_disable_set(hw, desc);
> - if (err)
> - return err;
> - } else {
> - return -ENOTSUPP;
> - }
> + else
> + err = -ENOTSUPP;
> break;
> case PIN_CONFIG_BIAS_PULL_UP:
> - if (hw->soc->bias_set) {
> + if (hw->soc->bias_set)
> err = hw->soc->bias_set(hw, desc, 1);
> - if (err)
> - return err;
> - } else {
> - return -ENOTSUPP;
> - }
> + else
> + err = -ENOTSUPP;
> break;
> case PIN_CONFIG_BIAS_PULL_DOWN:
> - if (hw->soc->bias_set) {
> + if (hw->soc->bias_set)
> err = hw->soc->bias_set(hw, desc, 0);
> - if (err)
> - return err;
> - } else {
> - return -ENOTSUPP;
> - }
> + else
> + err = -ENOTSUPP;
> break;
> case PIN_CONFIG_OUTPUT_ENABLE:
> err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT,
> MTK_DISABLE);
> - if (err)
> + /* keep set direction to if SMT is not supported on this pin */
> + if (err != -ENOTSUPP)
> goto err;
>
> err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
> MTK_OUTPUT);
> - if (err)
> - goto err;
> break;
> case PIN_CONFIG_INPUT_ENABLE:
> - if (hw->soc->ies_present) {
> - mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_IES,
> - MTK_ENABLE);
> - }
> + /* regard all non-zero value as enable */
> + err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_IES, !!arg);
> + if (err)
> + goto err;
>
> err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
> MTK_INPUT);
> - if (err)
> - goto err;
> break;
> case PIN_CONFIG_SLEW_RATE:
> - err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SR,
> - arg);
> - if (err)
> - goto err;
> -
> + /* regard all non-zero value as enable */
> + err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SR, !!arg);
> break;
> case PIN_CONFIG_OUTPUT:
> err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
> @@ -279,41 +244,29 @@ static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
>
> err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO,
> arg);
> - if (err)
> - goto err;
> break;
> + case PIN_CONFIG_INPUT_SCHMITT:
> case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
> - /* arg = 1: Input mode & SMT enable ;
> + /* arg = 1: Input mode & SMT enable
> * arg = 0: Output mode & SMT disable
> */
> - arg = arg ? 2 : 1;
> - err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
> - arg & 1);
> + err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, !arg);
> if (err)
> goto err;
>
> - err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT,
> - !!(arg & 2));
> - if (err)
> - goto err;
> + err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, !!arg);
> break;
> case PIN_CONFIG_DRIVE_STRENGTH:
> - if (hw->soc->drive_set) {
> + if (hw->soc->drive_set)
> err = hw->soc->drive_set(hw, desc, arg);
> - if (err)
> - return err;
> - } else {
> - return -ENOTSUPP;
> - }
> + else
> + err = -ENOTSUPP;
> break;
> case MTK_PIN_CONFIG_TDSEL:
> case MTK_PIN_CONFIG_RDSEL:
> reg = (param == MTK_PIN_CONFIG_TDSEL) ?
> PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL;
> -
> err = mtk_hw_set_value(hw, desc, reg, arg);
> - if (err)
> - goto err;
> break;
> case MTK_PIN_CONFIG_PU_ADV:
> case MTK_PIN_CONFIG_PD_ADV:
> @@ -323,20 +276,14 @@ static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
> pullup = param == MTK_PIN_CONFIG_PU_ADV;
> err = hw->soc->adv_pull_set(hw, desc, pullup,
> arg);
> - if (err)
> - return err;
> - } else {
> - return -ENOTSUPP;
> - }
> + } else
> + err = -ENOTSUPP;
> break;
> case MTK_PIN_CONFIG_DRV_ADV:
> - if (hw->soc->adv_drive_set) {
> + if (hw->soc->adv_drive_set)
> err = hw->soc->adv_drive_set(hw, desc, arg);
> - if (err)
> - return err;
> - } else {
> - return -ENOTSUPP;
> - }
> + else
> + err = -ENOTSUPP;
> break;
> default:
> err = -ENOTSUPP;
> @@ -952,6 +899,7 @@ int mtk_paris_pinctrl_probe(struct platform_device *pdev,
> return 0;
> }
>
> +
Remove unnecessary the change.
> static int mtk_paris_pinctrl_suspend(struct device *device)
> {
> struct mtk_pinctrl *pctl = dev_get_drvdata(device);
> @@ -970,4 +918,3 @@ static int mtk_paris_pinctrl_resume(struct device *device)
> .suspend_noirq = mtk_paris_pinctrl_suspend,
> .resume_noirq = mtk_paris_pinctrl_resume,
> };
> -
Remove unnecessary the change.
> --
> 1.8.1.1.dirty
>
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