Re: [PATCH V7 06/12] thermal: tegra: add a debugfs to show registers

From: Eduardo Valentin
Date: Mon Mar 14 2016 - 15:08:51 EST

On Fri, Mar 11, 2016 at 11:10:35AM +0800, Wei Ni wrote:
> Add a debugfs interface to show register contents for debug.
>
> Signed-off-by: Wei Ni <wni@xxxxxxxxxx>
> ---
> drivers/thermal/tegra/soctherm.c | 143 ++++++++++++++++++++++++++++++++++++++-
> drivers/thermal/tegra/soctherm.h | 2 +
> 2 files changed, 142 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c
> index 52a33760e8e8..02ac6d2e5a20 100644
> --- a/drivers/thermal/tegra/soctherm.c
> +++ b/drivers/thermal/tegra/soctherm.c
> @@ -15,6 +15,7 @@
> *
> */
>
> +#include <linux/debugfs.h>
> #include <linux/bitops.h>
> #include <linux/clk.h>
> #include <linux/delay.h>
> @@ -33,14 +34,18 @@
>
> #define SENSOR_CONFIG0 0
> #define SENSOR_CONFIG0_STOP BIT(0)
> -#define SENSOR_CONFIG0_TALL_SHIFT 8
> -#define SENSOR_CONFIG0_TCALC_OVER BIT(4)
> -#define SENSOR_CONFIG0_OVER BIT(3)
> #define SENSOR_CONFIG0_CPTR_OVER BIT(2)
> +#define SENSOR_CONFIG0_OVER BIT(3)
> +#define SENSOR_CONFIG0_TCALC_OVER BIT(4)
> +#define SENSOR_CONFIG0_TALL_MASK (0xfffff << 8)
> +#define SENSOR_CONFIG0_TALL_SHIFT 8
>
> #define SENSOR_CONFIG1 4
> +#define SENSOR_CONFIG1_TSAMPLE_MASK 0x3ff
> #define SENSOR_CONFIG1_TSAMPLE_SHIFT 0
> +#define SENSOR_CONFIG1_TIDDQ_EN_MASK (0x3f << 15)
> #define SENSOR_CONFIG1_TIDDQ_EN_SHIFT 15
> +#define SENSOR_CONFIG1_TEN_COUNT_MASK (0x3f << 24)
> #define SENSOR_CONFIG1_TEN_COUNT_SHIFT 24
> #define SENSOR_CONFIG1_TEMP_ENABLE BIT(31)
>
> @@ -49,6 +54,14 @@
> * because, it will be used by tegra_soctherm_fuse.c
> */
>
> +#define SENSOR_STATUS0 0xc
> +#define SENSOR_STATUS0_VALID_MASK BIT(31)
> +#define SENSOR_STATUS0_CAPTURE_MASK 0xffff
> +
> +#define SENSOR_STATUS1 0x10
> +#define SENSOR_STATUS1_TEMP_VALID_MASK BIT(31)
> +#define SENSOR_STATUS1_TEMP_MASK 0xffff
> +
> #define READBACK_VALUE_MASK 0xff00
> #define READBACK_VALUE_SHIFT 8
> #define READBACK_ADD_HALF BIT(7)
> @@ -73,6 +86,8 @@ struct tegra_soctherm {
>
> u32 *calib;
> struct tegra_soctherm_soc *soc;
> +
> + struct dentry *debugfs_dir;
> };
>
> static int enable_tsensor(struct tegra_soctherm *tegra,
> @@ -140,6 +155,124 @@ static const struct thermal_zone_of_device_ops tegra_of_thermal_ops = {
> .get_temp = tegra_thermctl_get_temp,
> };
>
> +#ifdef CONFIG_DEBUG_FS
> +static int regs_show(struct seq_file *s, void *data)
> +{
> + struct platform_device *pdev = s->private;
> + struct tegra_soctherm *ts = platform_get_drvdata(pdev);
> + const struct tegra_tsensor *tsensors = ts->soc->tsensors;
> + u32 r, state;
> + int i;
> +
> + seq_puts(s, "-----TSENSE (convert HW)-----\n");
> +
> + for (i = 0; i < ts->soc->num_tsensors; i++) {
> + r = readl(ts->regs + tsensors[i].base + SENSOR_CONFIG1);
> + state = REG_GET_MASK(r, SENSOR_CONFIG1_TEMP_ENABLE);
> + if (!state)
> + continue;
> +
> + seq_printf(s, "%s: ", tsensors[i].name);
> +
> + seq_printf(s, "En(%d) ", state);


Shouldnt the above if (!state) be place right here?


> + state = REG_GET_MASK(r, SENSOR_CONFIG1_TIDDQ_EN_MASK);
> + seq_printf(s, "tiddq(%d) ", state);
> + state = REG_GET_MASK(r, SENSOR_CONFIG1_TEN_COUNT_MASK);
> + seq_printf(s, "ten_count(%d) ", state);
> + state = REG_GET_MASK(r, SENSOR_CONFIG1_TSAMPLE_MASK);
> + seq_printf(s, "tsample(%d) ", state + 1);
> +
> + r = readl(ts->regs + tsensors[i].base + SENSOR_STATUS1);
> + state = REG_GET_MASK(r, SENSOR_STATUS1_TEMP_VALID_MASK);
> + seq_printf(s, "Temp(%d/", state);
> + state = REG_GET_MASK(r, SENSOR_STATUS1_TEMP_MASK);
> + seq_printf(s, "%d) ", translate_temp(state));
> +
> + r = readl(ts->regs + tsensors[i].base + SENSOR_STATUS0);
> + state = REG_GET_MASK(r, SENSOR_STATUS0_VALID_MASK);
> + seq_printf(s, "Capture(%d/", state);
> + state = REG_GET_MASK(r, SENSOR_STATUS0_CAPTURE_MASK);
> + seq_printf(s, "%d) ", state);
> +
> + r = readl(ts->regs + tsensors[i].base + SENSOR_CONFIG0);
> + state = REG_GET_MASK(r, SENSOR_CONFIG0_STOP);
> + seq_printf(s, "Stop(%d) ", state);
> + state = REG_GET_MASK(r, SENSOR_CONFIG0_TALL_MASK);
> + seq_printf(s, "Tall(%d) ", state);
> + state = REG_GET_MASK(r, SENSOR_CONFIG0_TCALC_OVER);
> + seq_printf(s, "Over(%d/", state);
> + state = REG_GET_MASK(r, SENSOR_CONFIG0_OVER);
> + seq_printf(s, "%d/", state);
> + state = REG_GET_MASK(r, SENSOR_CONFIG0_CPTR_OVER);
> + seq_printf(s, "%d) ", state);
> +
> + r = readl(ts->regs + tsensors[i].base + SENSOR_CONFIG2);
> + state = REG_GET_MASK(r, SENSOR_CONFIG2_THERMA_MASK);
> + seq_printf(s, "Therm_A/B(%d/", state);
> + state = REG_GET_MASK(r, SENSOR_CONFIG2_THERMB_MASK);
> + seq_printf(s, "%d)\n", (s16)state);
> + }
> +
> + r = readl(ts->regs + SENSOR_PDIV);
> + seq_printf(s, "PDIV: 0x%x\n", r);

This is a matter of taste, but:

Why here %x but all the above %d?

Reg dumps are typically %x.
> +
> + r = readl(ts->regs + SENSOR_HOTSPOT_OFF);
> + seq_printf(s, "HOTSPOT: 0x%x\n", r);
> +
> + seq_puts(s, "\n");
> + seq_puts(s, "-----SOC_THERM-----\n");
> +
> + r = readl(ts->regs + SENSOR_TEMP1);
> + state = REG_GET_MASK(r, SENSOR_TEMP1_CPU_TEMP_MASK);
> + seq_printf(s, "Temperatures: CPU(%d) ", translate_temp(state));

Maybe a line break before CPU, for consistency?

> + state = REG_GET_MASK(r, SENSOR_TEMP1_GPU_TEMP_MASK);
> + seq_printf(s, " GPU(%d) ", translate_temp(state));
> + r = readl(ts->regs + SENSOR_TEMP2);
> + state = REG_GET_MASK(r, SENSOR_TEMP2_PLLX_TEMP_MASK);
> + seq_printf(s, " PLLX(%d) ", translate_temp(state));
> + state = REG_GET_MASK(r, SENSOR_TEMP2_MEM_TEMP_MASK);
> + seq_printf(s, " MEM(%d)\n", translate_temp(state));
> +

I got confused, I thought you would the above mapped as tsensors[i]. I
will check the code again.


> + return 0;
> +}
> +
> +static int regs_open(struct inode *inode, struct file *file)
> +{
> + return single_open(file, regs_show, inode->i_private);
> +}
> +
> +static const struct file_operations regs_fops = {
> + .open = regs_open,
> + .read = seq_read,
> + .llseek = seq_lseek,
> + .release = single_release,
> +};
> +
> +static void soctherm_debug_init(struct platform_device *pdev)
> +{
> + struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
> + struct dentry *root, *file;
> +
> + root = debugfs_create_dir("soctherm", NULL);
> + if (!root) {
> + dev_err(&pdev->dev, "failed to create debugfs directory\n");
> + return;
> + }
> +
> + tegra->debugfs_dir = root;
> +
> + file = debugfs_create_file("reg_contents", 0644, root,
> + pdev, &regs_fops);
> + if (!file)
> + dev_err(&pdev->dev, "failed to create debugfs file\n");

Are we leaving the 'soctherm' dir left uncleaned in fail path here?

> +}
> +#else
> +static inline void soctherm_debug_init(struct platform_device *pdev)
> +{
> + return 0;

I dont think we need this return for a void function.

> +}
> +#endif
> +
> static const struct of_device_id tegra_soctherm_of_match[] = {
> #ifdef CONFIG_ARCH_TEGRA_124_SOC
> {
> @@ -279,6 +412,8 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
> }
> }
>
> + soctherm_debug_init(pdev);
> +
> return 0;
>
> disable_clocks:
> @@ -292,6 +427,8 @@ static int tegra_soctherm_remove(struct platform_device *pdev)
> {
> struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
>
> + debugfs_remove_recursive(tegra->debugfs_dir);
> +
> clk_disable_unprepare(tegra->clock_tsensor);
> clk_disable_unprepare(tegra->clock_soctherm);
>
> diff --git a/drivers/thermal/tegra/soctherm.h b/drivers/thermal/tegra/soctherm.h
> index 69d317269af1..ec4b87616d01 100644
> --- a/drivers/thermal/tegra/soctherm.h
> +++ b/drivers/thermal/tegra/soctherm.h
> @@ -16,7 +16,9 @@
> #define __DRIVERS_THERMAL_TEGRA_SOCTHERM_H
>
> #define SENSOR_CONFIG2 8
> +#define SENSOR_CONFIG2_THERMA_MASK (0xffff << 16)
> #define SENSOR_CONFIG2_THERMA_SHIFT 16
> +#define SENSOR_CONFIG2_THERMB_MASK 0xffff
> #define SENSOR_CONFIG2_THERMB_SHIFT 0
>
> #define SENSOR_PDIV 0x1c0
> --
> 1.9.1
>

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