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Merge branch 'for-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux

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Pull thermal fixes from Zhang Rui:
 "Three fixes for Armada (380) and TI (dra7 and OMAP5) thermal soc
  drivers"

* 'for-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux:
  thermal: armada: Update Armada 380 thermal sensor coefficients
  thermal: ti-soc-thermal: OMAP5: Implement Workaround for Errata i813
  thermal: ti-soc-thermal: dra7: Implement Workaround for Errata i814
This commit is contained in:
Linus Torvalds 2015-05-21 17:42:54 -07:00
commit 18658921a2
5 changed files with 89 additions and 7 deletions
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6
drivers/thermal/armada_thermal.c
View file

@ -224,9 +224,9 @@ static const struct armada_thermal_data armada380_data = {
.is_valid_shift = 10,
.temp_shift = 0,
.temp_mask = 0x3ff,
.coef_b = 1169498786UL,
.coef_m = 2000000UL,
.coef_div = 4289,
.coef_b = 2931108200UL,
.coef_m = 5000000UL,
.coef_div = 10502,
.inverted = true,
};

3
drivers/thermal/ti-soc-thermal/dra752-thermal-data.c
View file

@ -420,7 +420,8 @@ const struct ti_bandgap_data dra752_data = {
TI_BANDGAP_FEATURE_FREEZE_BIT |
TI_BANDGAP_FEATURE_TALERT |
TI_BANDGAP_FEATURE_COUNTER_DELAY |
TI_BANDGAP_FEATURE_HISTORY_BUFFER,
TI_BANDGAP_FEATURE_HISTORY_BUFFER |
TI_BANDGAP_FEATURE_ERRATA_814,
.fclock_name = "l3instr_ts_gclk_div",
.div_ck_name = "l3instr_ts_gclk_div",
.conv_table = dra752_adc_to_temp,

3
drivers/thermal/ti-soc-thermal/omap5-thermal-data.c
View file

@ -319,7 +319,8 @@ const struct ti_bandgap_data omap5430_data = {
TI_BANDGAP_FEATURE_FREEZE_BIT |
TI_BANDGAP_FEATURE_TALERT |
TI_BANDGAP_FEATURE_COUNTER_DELAY |
TI_BANDGAP_FEATURE_HISTORY_BUFFER,
TI_BANDGAP_FEATURE_HISTORY_BUFFER |
TI_BANDGAP_FEATURE_ERRATA_813,
.fclock_name = "l3instr_ts_gclk_div",
.div_ck_name = "l3instr_ts_gclk_div",
.conv_table = omap5430_adc_to_temp,

78
drivers/thermal/ti-soc-thermal/ti-bandgap.c
View file

@ -118,6 +118,37 @@ static int ti_bandgap_power(struct ti_bandgap *bgp, bool on)
return ret;
}
/**
* ti_errata814_bandgap_read_temp() - helper function to read dra7 sensor temperature
* @bgp: pointer to ti_bandgap structure
* @reg: desired register (offset) to be read
*
* Function to read dra7 bandgap sensor temperature. This is done separately
* so as to workaround the errata "Bandgap Temperature read Dtemp can be
* corrupted" - Errata ID: i814".
* Read accesses to registers listed below can be corrupted due to incorrect
* resynchronization between clock domains.
* Read access to registers below can be corrupted :
* CTRL_CORE_DTEMP_MPU/GPU/CORE/DSPEVE/IVA_n (n = 0 to 4)
* CTRL_CORE_TEMP_SENSOR_MPU/GPU/CORE/DSPEVE/IVA_n
*
* Return: the register value.
*/
static u32 ti_errata814_bandgap_read_temp(struct ti_bandgap *bgp, u32 reg)
{
u32 val1, val2;
val1 = ti_bandgap_readl(bgp, reg);
val2 = ti_bandgap_readl(bgp, reg);
/* If both times we read the same value then that is right */
if (val1 == val2)
return val1;
/* if val1 and val2 are different read it third time */
return ti_bandgap_readl(bgp, reg);
}
/**
* ti_bandgap_read_temp() - helper function to read sensor temperature
* @bgp: pointer to ti_bandgap structure
@ -148,7 +179,11 @@ static u32 ti_bandgap_read_temp(struct ti_bandgap *bgp, int id)
}
/* read temperature */
temp = ti_bandgap_readl(bgp, reg);
if (TI_BANDGAP_HAS(bgp, ERRATA_814))
temp = ti_errata814_bandgap_read_temp(bgp, reg);
else
temp = ti_bandgap_readl(bgp, reg);
temp &= tsr->bgap_dtemp_mask;
if (TI_BANDGAP_HAS(bgp, FREEZE_BIT))
@ -410,7 +445,7 @@ static int ti_bandgap_update_alert_threshold(struct ti_bandgap *bgp, int id,
{
struct temp_sensor_data *ts_data = bgp->conf->sensors[id].ts_data;
struct temp_sensor_registers *tsr;
u32 thresh_val, reg_val, t_hot, t_cold;
u32 thresh_val, reg_val, t_hot, t_cold, ctrl;
int err = 0;
tsr = bgp->conf->sensors[id].registers;
@ -442,8 +477,47 @@ static int ti_bandgap_update_alert_threshold(struct ti_bandgap *bgp, int id,
~(tsr->threshold_thot_mask | tsr->threshold_tcold_mask);
reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask)) |
(t_cold << __ffs(tsr->threshold_tcold_mask));
/**
* Errata i813:
* Spurious Thermal Alert: Talert can happen randomly while the device
* remains under the temperature limit defined for this event to trig.
* This spurious event is caused by a incorrect re-synchronization
* between clock domains. The comparison between configured threshold
* and current temperature value can happen while the value is
* transitioning (metastable), thus causing inappropriate event
* generation. No spurious event occurs as long as the threshold value
* stays unchanged. Spurious event can be generated while a thermal
* alert threshold is modified in
* CONTROL_BANDGAP_THRESHOLD_MPU/GPU/CORE/DSPEVE/IVA_n.
*/
if (TI_BANDGAP_HAS(bgp, ERRATA_813)) {
/* Mask t_hot and t_cold events at the IP Level */
ctrl = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl);
if (hot)
ctrl &= ~tsr->mask_hot_mask;
else
ctrl &= ~tsr->mask_cold_mask;
ti_bandgap_writel(bgp, ctrl, tsr->bgap_mask_ctrl);
}
/* Write the threshold value */
ti_bandgap_writel(bgp, reg_val, tsr->bgap_threshold);
if (TI_BANDGAP_HAS(bgp, ERRATA_813)) {
/* Unmask t_hot and t_cold events at the IP Level */
ctrl = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl);
if (hot)
ctrl |= tsr->mask_hot_mask;
else
ctrl |= tsr->mask_cold_mask;
ti_bandgap_writel(bgp, ctrl, tsr->bgap_mask_ctrl);
}
if (err) {
dev_err(bgp->dev, "failed to reprogram thot threshold\n");
err = -EIO;

6
drivers/thermal/ti-soc-thermal/ti-bandgap.h
View file

@ -318,6 +318,10 @@ struct ti_temp_sensor {
* TI_BANDGAP_FEATURE_HISTORY_BUFFER - used when the bandgap device features
* a history buffer of temperatures.
*
* TI_BANDGAP_FEATURE_ERRATA_814 - used to workaorund when the bandgap device
* has Errata 814
* TI_BANDGAP_FEATURE_ERRATA_813 - used to workaorund when the bandgap device
* has Errata 813
* 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.
*/
@ -331,6 +335,8 @@ struct ti_temp_sensor {
#define TI_BANDGAP_FEATURE_FREEZE_BIT BIT(7)
#define TI_BANDGAP_FEATURE_COUNTER_DELAY BIT(8)
#define TI_BANDGAP_FEATURE_HISTORY_BUFFER BIT(9)
#define TI_BANDGAP_FEATURE_ERRATA_814 BIT(10)
#define TI_BANDGAP_FEATURE_ERRATA_813 BIT(11)
#define TI_BANDGAP_HAS(b, f) \
((b)->conf->features & TI_BANDGAP_FEATURE_ ## f)