| Message ID | 1362978365-5593-5-git-send-email-lokeshvutla@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Monday 11 March 2013 10:36 AM, Lokesh Vutla wrote: > From: Nishanth Menon <nm@ti.com> > > As per JESD209-2E specification for LPDDR2, > http://www.jedec.org/standards-documents/results/jesd209-2E > Table 73, LPDDR2 memories come in two flavors - Standard and > Extended. The Standard types can operate from -25C to +85C > However, beyond that and upto +105C can only be supported by > Extended types. > right. > Unfortunately, it seems there is no info in MR0(device info) or > MR[1,2](device feature) for run time detection of this capability > as far as seen on the spec. Hence, we provide a custom_config > flag to be populated by platforms which have these "extended" > type memories. > > For the "Standard" memories, we need to consider MR4 notifications > of temperature triggers >85C as equivalent to thermal shutdown > events (equivalent to Spec specified thermal shutdown events for > "extended" parts). > Make sense. > Reported-by: Richard Woodruff <r-woodruff2@ti.com> > Signed-off-by: Nishanth Menon <nm@ti.com> > Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> > --- Thanks for the fix. Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/memory/emif.c b/drivers/memory/emif.c index 37e0c77..927fb55 100644 --- a/drivers/memory/emif.c +++ b/drivers/memory/emif.c @@ -914,6 +914,7 @@ static irqreturn_t handle_temp_alert(void __iomem *base, struct emif_data *emif) { u32 old_temp_level; irqreturn_t ret = IRQ_HANDLED; + struct emif_custom_configs *custom_configs; spin_lock_irqsave(&emif_lock, irq_state); old_temp_level = emif->temperature_level; @@ -926,6 +927,29 @@ static irqreturn_t handle_temp_alert(void __iomem *base, struct emif_data *emif) goto out; } + custom_configs = emif->plat_data->custom_configs; + + /* + * IF we detect higher than "nominal rating" from DDR sensor + * on an unsupported DDR part, shutdown system + */ + if (custom_configs && !(custom_configs->mask & + EMIF_CUSTOM_CONFIG_EXTENDED_TEMP_PART)) { + if (emif->temperature_level >= SDRAM_TEMP_HIGH_DERATE_REFRESH) { + dev_err(emif->dev, + "%s:NOT Extended temperature capable memory." + "Converting MR4=0x%02x as shutdown event\n", + __func__, emif->temperature_level); + /* + * Temperature far too high - do kernel_power_off() + * from thread context + */ + emif->temperature_level = SDRAM_TEMP_VERY_HIGH_SHUTDOWN; + ret = IRQ_WAKE_THREAD; + goto out; + } + } + if (emif->temperature_level < old_temp_level || emif->temperature_level == SDRAM_TEMP_VERY_HIGH_SHUTDOWN) { /* @@ -1224,6 +1248,9 @@ static void __init_or_module of_get_custom_configs(struct device_node *np_emif, cust_cfgs->temp_alert_poll_interval_ms = *poll_intvl; } + if (of_find_property(np_emif, "extended-temp-part", &len)) + cust_cfgs->mask |= EMIF_CUSTOM_CONFIG_EXTENDED_TEMP_PART; + if (!is_custom_config_valid(cust_cfgs, emif->dev)) { devm_kfree(emif->dev, cust_cfgs); return; diff --git a/include/linux/platform_data/emif_plat.h b/include/linux/platform_data/emif_plat.h index 03378ca..5c19a2a 100644 --- a/include/linux/platform_data/emif_plat.h +++ b/include/linux/platform_data/emif_plat.h @@ -40,6 +40,7 @@ /* Custom config requests */ #define EMIF_CUSTOM_CONFIG_LPMODE 0x00000001 #define EMIF_CUSTOM_CONFIG_TEMP_ALERT_POLL_INTERVAL 0x00000002 +#define EMIF_CUSTOM_CONFIG_EXTENDED_TEMP_PART 0x00000004 #ifndef __ASSEMBLY__ /**