memory: emif: Handle devices which are not rated for >85C
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. 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). Reported-by: Richard Woodruff <r-woodruff2@ti.com> Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Родитель
25aaacd283
Коммит
f91a595d0b
|
@ -918,6 +918,7 @@ 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;
|
||||
|
@ -930,6 +931,29 @@ 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) {
|
||||
/*
|
||||
|
@ -1228,6 +1252,9 @@ 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;
|
||||
|
|
|
@ -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__
|
||||
/**
|
||||
|
|
Загрузка…
Ссылка в новой задаче