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Date: Wed, 8 Jul 2020 19:55:40 +0800
From: Frank Lee <tiny.windzz@...il.com>
To: Ondrej Jirman <megous@...ous.com>
Cc: linux-sunxi@...glegroups.com,
Vasily Khoruzhick <anarsoul@...il.com>,
Zhang Rui <rui.zhang@...el.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Amit Kucheria <amit.kucheria@...durent.com>,
Maxime Ripard <mripard@...nel.org>,
Chen-Yu Tsai <wens@...e.org>,
"open list:ALLWINNER THERMAL DRIVER" <linux-pm@...r.kernel.org>,
"moderated list:ARM/Allwinner sunXi SoC support"
<linux-arm-kernel@...ts.infradead.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] thermal: sun8i: Be loud when probe fails
HI Ondrej,
On Wed, Jul 8, 2020 at 6:55 PM Ondrej Jirman <megous@...ous.com> wrote:
>
> I noticed several mobile Linux distributions failing to enable the
> thermal regulation correctly, because the kernel is silent
> when thermal driver fails to probe. Add enough error reporting
> to debug issues and warn users in case thermal sensor is failing
> to probe.
>
> Failing to notify users means, that SoC can easily overheat under
> load.
>
> Signed-off-by: Ondrej Jirman <megous@...ous.com>
> ---
> drivers/thermal/sun8i_thermal.c | 55 ++++++++++++++++++++++++++-------
> 1 file changed, 43 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
> index 74d73be16496..9065e79ae743 100644
> --- a/drivers/thermal/sun8i_thermal.c
> +++ b/drivers/thermal/sun8i_thermal.c
> @@ -287,8 +287,12 @@ static int sun8i_ths_calibrate(struct ths_device *tmdev)
>
> calcell = devm_nvmem_cell_get(dev, "calibration");
> if (IS_ERR(calcell)) {
> + dev_err(dev, "Failed to get calibration nvmem cell (%ld)\n",
> + PTR_ERR(calcell));
> +
> if (PTR_ERR(calcell) == -EPROBE_DEFER)
> return -EPROBE_DEFER;
> +
> /*
> * Even if the external calibration data stored in sid is
> * not accessible, the THS hardware can still work, although
> @@ -308,6 +312,8 @@ static int sun8i_ths_calibrate(struct ths_device *tmdev)
> caldata = nvmem_cell_read(calcell, &callen);
> if (IS_ERR(caldata)) {
> ret = PTR_ERR(caldata);
> + dev_err(dev, "Failed to read calibration data (%d)\n",
> + ret);
> goto out;
> }
>
> @@ -330,23 +336,35 @@ static int sun8i_ths_resource_init(struct ths_device *tmdev)
> return PTR_ERR(base);
>
> tmdev->regmap = devm_regmap_init_mmio(dev, base, &config);
> - if (IS_ERR(tmdev->regmap))
> + if (IS_ERR(tmdev->regmap)) {
> + dev_err(dev, "Failed to init regmap (%ld)\n",
> + PTR_ERR(tmdev->regmap));
> return PTR_ERR(tmdev->regmap);
> + }
>
> if (tmdev->chip->has_bus_clk_reset) {
> tmdev->reset = devm_reset_control_get(dev, NULL);
> - if (IS_ERR(tmdev->reset))
> + if (IS_ERR(tmdev->reset)) {
> + dev_err(dev, "Failed to get reset (%ld)\n",
> + PTR_ERR(tmdev->reset));
> return PTR_ERR(tmdev->reset);
> + }
>
> tmdev->bus_clk = devm_clk_get(&pdev->dev, "bus");
> - if (IS_ERR(tmdev->bus_clk))
> + if (IS_ERR(tmdev->bus_clk)) {
> + dev_err(dev, "Failed to get bus clock (%ld)\n",
> + PTR_ERR(tmdev->bus_clk));
> return PTR_ERR(tmdev->bus_clk);
> + }
> }
>
> if (tmdev->chip->has_mod_clk) {
> tmdev->mod_clk = devm_clk_get(&pdev->dev, "mod");
> - if (IS_ERR(tmdev->mod_clk))
> + if (IS_ERR(tmdev->mod_clk)) {
> + dev_err(dev, "Failed to get mod clock (%ld)\n",
> + PTR_ERR(tmdev->mod_clk));
> return PTR_ERR(tmdev->mod_clk);
> + }
> }
>
> ret = reset_control_deassert(tmdev->reset);
> @@ -471,8 +489,12 @@ static int sun8i_ths_register(struct ths_device *tmdev)
> i,
> &tmdev->sensor[i],
> &ths_ops);
> - if (IS_ERR(tmdev->sensor[i].tzd))
> + if (IS_ERR(tmdev->sensor[i].tzd)) {
> + dev_err(tmdev->dev,
> + "Failed to register sensor %d (%ld)\n",
> + i, PTR_ERR(tmdev->sensor[i].tzd));
> return PTR_ERR(tmdev->sensor[i].tzd);
> + }
>
> if (devm_thermal_add_hwmon_sysfs(tmdev->sensor[i].tzd))
> dev_warn(tmdev->dev,
> @@ -501,19 +523,21 @@ static int sun8i_ths_probe(struct platform_device *pdev)
>
> ret = sun8i_ths_resource_init(tmdev);
> if (ret)
> - return ret;
> + goto err_out;
>
> irq = platform_get_irq(pdev, 0);
> - if (irq < 0)
> - return irq;
> + if (irq < 0) {
> + ret = irq;
> + goto err_out;
> + }
>
> ret = tmdev->chip->init(tmdev);
> if (ret)
> - return ret;
> + goto err_out;
>
> ret = sun8i_ths_register(tmdev);
> if (ret)
> - return ret;
> + goto err_out;
>
> /*
> * Avoid entering the interrupt handler, the thermal device is not
> @@ -523,10 +547,17 @@ static int sun8i_ths_probe(struct platform_device *pdev)
> ret = devm_request_threaded_irq(dev, irq, NULL,
> sun8i_irq_thread,
> IRQF_ONESHOT, "ths", tmdev);
> - if (ret)
> - return ret;
> + if (ret) {
> + dev_err(dev, "Failed to request irq (%d)\n", ret);
> + goto err_out;
> + }
>
> + dev_info(dev, "Thermal sensor ready!\n");
> return 0;
> +
> +err_out:
> + dev_err(dev, "Failed to probe thermal sensor (%d)\n", ret);
When the driver fails, there will be this print. Isn't it superfluous
for you to add these？
sun8i-thermal: probe of 5070400.thermal-sensor failed with error
Yangtao
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