mmc: core: Add support for notifying host driver while scaling clocks
Host drivers can participate in clock scaling by registering
->notify_load host operation, which allows host driver to carry out
platform specific operations for further power savings or increasing
throughput based on whether load is LOW or HIGH respectively. This
can be applicable to non-ultra high speed cards as well so remove
the check for ultra high speed cards to initialize clock scaling.
Change-Id: Icaab9520135e384f5470db68b2f25c5cdce5663a
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 9eef3a0..48be19a 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -82,6 +82,12 @@
#define MMC_SET_DRIVER_TYPE_D 3
};
+/* states to represent load on the host */
+enum mmc_load {
+ MMC_LOAD_HIGH,
+ MMC_LOAD_LOW,
+};
+
struct mmc_host_ops {
/*
* 'enable' is called when the host is claimed and 'disable' is called
@@ -140,6 +146,7 @@
void (*hw_reset)(struct mmc_host *host);
unsigned long (*get_max_frequency)(struct mmc_host *host);
unsigned long (*get_min_frequency)(struct mmc_host *host);
+ int (*notify_load)(struct mmc_host *, enum mmc_load);
int (*stop_request)(struct mmc_host *host);
unsigned int (*get_xfer_remain)(struct mmc_host *host);
};
@@ -401,6 +408,7 @@
bool initialized;
bool in_progress;
struct delayed_work work;
+ enum mmc_load state;
} clk_scaling;
unsigned long private[0] ____cacheline_aligned;
};