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Message-Id: <1680004791-4216-1-git-send-email-quic_minghao@quicinc.com>
Date: Tue, 28 Mar 2023 19:59:51 +0800
From: Minghao Zhang <quic_minghao@...cinc.com>
To: agross@...nel.org, andersson@...nel.org,
konrad.dybcio@...ainline.org, linus.walleij@...aro.or
Cc: Minghao Zhang <quic_minghao@...cinc.com>,
linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
linux-kernel@...r.kernel.org, quic_satyap@...cinc.com,
quic_tsoni@...cinc.com
Subject: [PATCH] pinctrl: qcom: Add support to log pin status before suspend for TLMM
This change supports to print pin status before device suspend
to debug for TLMM. And expose 2 APIs to enable/disable this
functionality.
Signed-off-by: Minghao Zhang <quic_minghao@...cinc.com>
---
drivers/pinctrl/qcom/pinctrl-msm.c | 133 +++++++++++++++++++++++++++++--------
drivers/pinctrl/qcom/pinctrl-msm.h | 1 +
2 files changed, 105 insertions(+), 29 deletions(-)
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index daeb79a..872c49f 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -83,6 +83,21 @@ struct msm_pinctrl {
u32 phys_base[MAX_NR_TILES];
};
+static bool pinctrl_msm_log_mask;
+
+static const char * const pulls_keeper[] = {
+ "no pull",
+ "pull down",
+ "keeper",
+ "pull up"
+};
+
+static const char * const pulls_no_keeper[] = {
+ "no pull",
+ "pull down",
+ "pull up",
+};
+
#define MSM_ACCESSOR(name) \
static u32 msm_readl_##name(struct msm_pinctrl *pctrl, \
const struct msm_pingroup *g) \
@@ -628,6 +643,29 @@ static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
}
+static void msm_gpio_pin_status_get(struct msm_pinctrl *pctrl, const struct msm_pingroup *g,
+ unsigned int offset, int *is_out, unsigned int *func,
+ int *drive, int *pull, int *egpio_enable, int *val)
+{
+ u32 ctl_reg, io_reg;
+
+ ctl_reg = msm_readl_ctl(pctrl, g);
+ io_reg = msm_readl_io(pctrl, g);
+
+ *is_out = !!(ctl_reg & BIT(g->oe_bit));
+ *func = (ctl_reg >> g->mux_bit) & 7;
+ *drive = (ctl_reg >> g->drv_bit) & 7;
+ *pull = (ctl_reg >> g->pull_bit) & 3;
+ *egpio_enable = 0;
+ if (pctrl->soc->egpio_func && ctl_reg & BIT(g->egpio_present))
+ *egpio_enable = !(ctl_reg & BIT(g->egpio_enable));
+
+ if (*is_out)
+ *val = !!(io_reg & BIT(g->out_bit));
+ else
+ *val = !!(io_reg & BIT(g->in_bit));
+}
+
#ifdef CONFIG_DEBUG_FS
static void msm_gpio_dbg_show_one(struct seq_file *s,
@@ -644,40 +682,13 @@ static void msm_gpio_dbg_show_one(struct seq_file *s,
int pull;
int val;
int egpio_enable;
- u32 ctl_reg, io_reg;
-
- static const char * const pulls_keeper[] = {
- "no pull",
- "pull down",
- "keeper",
- "pull up"
- };
-
- static const char * const pulls_no_keeper[] = {
- "no pull",
- "pull down",
- "pull up",
- };
if (!gpiochip_line_is_valid(chip, offset))
return;
g = &pctrl->soc->groups[offset];
- ctl_reg = msm_readl_ctl(pctrl, g);
- io_reg = msm_readl_io(pctrl, g);
-
- is_out = !!(ctl_reg & BIT(g->oe_bit));
- func = (ctl_reg >> g->mux_bit) & 7;
- drive = (ctl_reg >> g->drv_bit) & 7;
- pull = (ctl_reg >> g->pull_bit) & 3;
- egpio_enable = 0;
- if (pctrl->soc->egpio_func && ctl_reg & BIT(g->egpio_present))
- egpio_enable = !(ctl_reg & BIT(g->egpio_enable));
-
- if (is_out)
- val = !!(io_reg & BIT(g->out_bit));
- else
- val = !!(io_reg & BIT(g->in_bit));
+ msm_gpio_pin_status_get(pctrl, g, offset, &is_out, &func,
+ &drive, &pull, &egpio_enable, &val);
if (egpio_enable) {
seq_printf(s, " %-8s: egpio\n", g->name);
@@ -707,6 +718,39 @@ static void msm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
#define msm_gpio_dbg_show NULL
#endif
+static void msm_gpio_log_pin_status(struct gpio_chip *chip, unsigned int offset)
+{
+ const struct msm_pingroup *g;
+ struct msm_pinctrl *pctrl = gpiochip_get_data(chip);
+ unsigned int func;
+ int is_out;
+ int drive;
+ int pull;
+ int val;
+ int egpio_enable;
+
+ if (!gpiochip_line_is_valid(chip, offset))
+ return;
+
+ g = &pctrl->soc->groups[offset];
+ msm_gpio_pin_status_get(pctrl, g, offset, &is_out, &func,
+ &drive, &pull, &egpio_enable, &val);
+
+ printk_deferred("%s: %s, %s, func%d, %dmA, %s\n",
+ g->name, is_out ? "out" : "in",
+ val ? "high" : "low", func,
+ msm_regval_to_drive(drive),
+ pctrl->soc->pull_no_keeper ? pulls_no_keeper[pull] : pulls_keeper[pull]);
+}
+
+static void msm_gpios_status(struct gpio_chip *chip)
+{
+ unsigned int i;
+
+ for (i = 0; i < chip->ngpio; i++)
+ msm_gpio_log_pin_status(chip, i);
+}
+
static int msm_gpio_init_valid_mask(struct gpio_chip *gc,
unsigned long *valid_mask,
unsigned int ngpios)
@@ -1450,6 +1494,35 @@ SIMPLE_DEV_PM_OPS(msm_pinctrl_dev_pm_ops, msm_pinctrl_suspend,
EXPORT_SYMBOL(msm_pinctrl_dev_pm_ops);
+void debug_pintctrl_msm_enable(void)
+{
+ pinctrl_msm_log_mask = true;
+}
+EXPORT_SYMBOL(debug_pintctrl_msm_enable);
+
+void debug_pintctrl_msm_disable(void)
+{
+ pinctrl_msm_log_mask = false;
+}
+EXPORT_SYMBOL(debug_pintctrl_msm_disable);
+
+static __maybe_unused int noirq_msm_pinctrl_suspend(struct device *dev)
+{
+ struct msm_pinctrl *pctrl = dev_get_drvdata(dev);
+
+ if (pinctrl_msm_log_mask) {
+ printk_deferred("%s\n", pctrl->chip.label);
+ msm_gpios_status(&pctrl->chip);
+ }
+
+ return 0;
+}
+
+const struct dev_pm_ops noirq_msm_pinctrl_dev_pm_ops = {
+ .suspend_noirq = noirq_msm_pinctrl_suspend,
+};
+EXPORT_SYMBOL(noirq_msm_pinctrl_dev_pm_ops);
+
int msm_pinctrl_probe(struct platform_device *pdev,
const struct msm_pinctrl_soc_data *soc_data)
{
@@ -1512,6 +1585,8 @@ int msm_pinctrl_probe(struct platform_device *pdev,
if (ret)
return ret;
+ pinctrl_msm_log_mask = false;
+
platform_set_drvdata(pdev, pctrl);
dev_dbg(&pdev->dev, "Probed Qualcomm pinctrl driver\n");
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.h b/drivers/pinctrl/qcom/pinctrl-msm.h
index 985eced..8ccbb6d 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.h
+++ b/drivers/pinctrl/qcom/pinctrl-msm.h
@@ -155,6 +155,7 @@ struct msm_pinctrl_soc_data {
};
extern const struct dev_pm_ops msm_pinctrl_dev_pm_ops;
+extern const struct dev_pm_ops noirq_msm_pinctrl_dev_pm_ops;
int msm_pinctrl_probe(struct platform_device *pdev,
const struct msm_pinctrl_soc_data *soc_data);
--
2.7.4
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