On Wed, Dec 30, 2020 at 2:43 AM Tony Lindgren <tony@xxxxxxxxxxx> wrote:
>
> At least for 4430, trying to use the single conversion mode eventually
> hangs the thermal sensor. This can be quite easily seen with errors:
>
> thermal thermal_zone0: failed to read out thermal zone (-5)
>
> Also, trying to read the temperature shows a stuck value with:
>
> $ while true; do cat /sys/class/thermal/thermal_zone0/temp; done
>
> Where the temperature is not rising at all with the busy loop.
>
> Additionally, the EOCZ (end of conversion) bit is not rising on 4430 in
> single conversion mode while it works fine in continuous conversion mode.
> It is also possible that the hung temperature sensor can affect the
> thermal shutdown alert too.
>
> Let's fix the issue by adding TI_BANDGAP_FEATURE_CONT_MODE_ONLY flag and
> use it for 4430.
>
> Note that we also need to add udelay to for the EOCZ (end of conversion)
> bit polling as otherwise we have it time out too early on 4430. We'll be
> changing the loop to use iopoll in the following clean-up patch.
>
> Cc: Adam Ford <aford173@xxxxxxxxx>
I don't have an OMAP4, but if you want, I can test a DM3730.
adam
> Cc: Carl Philipp Klemm <philipp@xxxxxxxx>
> Cc: Eduardo Valentin <edubezval@xxxxxxxxx>
> Cc: Merlijn Wajer <merlijn@xxxxxxxxxx>
> Cc: Pavel Machek <pavel@xxxxxx>
> Cc: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx>
> Cc: Sebastian Reichel <sre@xxxxxxxxxx>
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
> drivers/thermal/ti-soc-thermal/omap4-thermal-data.c | 3 ++-
> drivers/thermal/ti-soc-thermal/ti-bandgap.c | 9 +++++++--
> drivers/thermal/ti-soc-thermal/ti-bandgap.h | 2 ++
> 3 files changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/thermal/ti-soc-thermal/omap4-thermal-data.c b/drivers/thermal/ti-soc-thermal/omap4-thermal-data.c
> --- a/drivers/thermal/ti-soc-thermal/omap4-thermal-data.c
> +++ b/drivers/thermal/ti-soc-thermal/omap4-thermal-data.c
> @@ -58,7 +58,8 @@ omap4430_adc_to_temp[OMAP4430_ADC_END_VALUE - OMAP4430_ADC_START_VALUE + 1] = {
> const struct ti_bandgap_data omap4430_data = {
> .features = TI_BANDGAP_FEATURE_MODE_CONFIG |
> TI_BANDGAP_FEATURE_CLK_CTRL |
> - TI_BANDGAP_FEATURE_POWER_SWITCH,
> + TI_BANDGAP_FEATURE_POWER_SWITCH |
> + TI_BANDGAP_FEATURE_CONT_MODE_ONLY,
> .fclock_name = "bandgap_fclk",
> .div_ck_name = "bandgap_fclk",
> .conv_table = omap4430_adc_to_temp,
> diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.c b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> --- a/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> +++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> @@ -15,6 +15,7 @@
> #include <linux/kernel.h>
> #include <linux/interrupt.h>
> #include <linux/clk.h>
> +#include <linux/delay.h>
> #include <linux/gpio/consumer.h>
> #include <linux/platform_device.h>
> #include <linux/err.h>
> @@ -605,8 +606,10 @@ ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id)
> u32 counter = 1000;
> struct temp_sensor_registers *tsr;
>
> - /* Select single conversion mode */
> - if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
> + /* Select continuous or single conversion mode */
> + if (TI_BANDGAP_HAS(bgp, CONT_MODE_ONLY))
> + RMW_BITS(bgp, id, bgap_mode_ctrl, mode_ctrl_mask, 1);
> + else if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
> RMW_BITS(bgp, id, bgap_mode_ctrl, mode_ctrl_mask, 0);
>
> /* Start of Conversion = 1 */
> @@ -619,6 +622,7 @@ ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id)
> if (ti_bandgap_readl(bgp, tsr->temp_sensor_ctrl) &
> tsr->bgap_eocz_mask)
> break;
> + udelay(1);
> }
>
> /* Start of Conversion = 0 */
> @@ -630,6 +634,7 @@ ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id)
> if (!(ti_bandgap_readl(bgp, tsr->temp_sensor_ctrl) &
> tsr->bgap_eocz_mask))
> break;
> + udelay(1);
> }
>
> return 0;
> diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.h b/drivers/thermal/ti-soc-thermal/ti-bandgap.h
> --- a/drivers/thermal/ti-soc-thermal/ti-bandgap.h
> +++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.h
> @@ -280,6 +280,7 @@ struct ti_temp_sensor {
> * has Errata 814
> * TI_BANDGAP_FEATURE_UNRELIABLE - used when the sensor readings are too
> * inaccurate.
> + * TI_BANDGAP_FEATURE_CONT_MODE_ONLY - used when single mode hangs the sensor
> * TI_BANDGAP_HAS(b, f) - macro to check if a bandgap device is capable of a
> * specific feature (above) or not. Return non-zero, if yes.
> */
> @@ -295,6 +296,7 @@ struct ti_temp_sensor {
> #define TI_BANDGAP_FEATURE_HISTORY_BUFFER BIT(9)
> #define TI_BANDGAP_FEATURE_ERRATA_814 BIT(10)
> #define TI_BANDGAP_FEATURE_UNRELIABLE BIT(11)
> +#define TI_BANDGAP_FEATURE_CONT_MODE_ONLY BIT(12)
> #define TI_BANDGAP_HAS(b, f) \
> ((b)->conf->features & TI_BANDGAP_FEATURE_ ## f)
>
> --
> 2.29.2
