3 files changed, 45 insertions, 3 deletions

diff --git a/drivers/thermal/ti-soc-thermal/omap5-thermal-data.c b/drivers/thermal/ti-soc-thermal/omap5-thermal-data.c
index eff0c80fd4af..79ff70c446ba 100644
--- a/drivers/thermal/ti-soc-thermal/omap5-thermal-data.c
+++ b/drivers/thermal/ti-soc-thermal/omap5-thermal-data.c
@@ -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,
diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.c b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
index 9747523858a1..bc14dc874594 100644
--- a/drivers/thermal/ti-soc-thermal/ti-bandgap.c
+++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
@@ -445,7 +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;
@@ -477,8 +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;
diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.h b/drivers/thermal/ti-soc-thermal/ti-bandgap.h
index b2da3fc42b51..0c52f7afba00 100644
--- a/drivers/thermal/ti-soc-thermal/ti-bandgap.h
+++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.h
@@ -320,7 +320,8 @@ struct ti_temp_sensor {
  *
  * 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.
  */
@@ -335,6 +336,7 @@ struct ti_temp_sensor {
 #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)