mtd: sh_flctl: Add power management with QoS request

Adds power management code with fine granularity. Every flash control
command is enclosed by runtime_put()/get()s. To make sure that no
overhead is generated by too frequent power state switches, a quality of
service request is issued.

Signed-off-by: Bastian Hecht <hechtb@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/mtd/sh_flctl.h b/include/linux/mtd/sh_flctl.h
index 8bcf299cb9bf..a38e1fa8af01 100644
--- a/include/linux/mtd/sh_flctl.h
+++ b/include/linux/mtd/sh_flctl.h
@@ -23,6 +23,7 @@
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/nand.h>
 #include <linux/mtd/partitions.h>
+#include <linux/pm_qos.h>
 
 /* FLCTL registers */
 #define FLCMNCR(f)              (f->reg + 0x0)
@@ -131,6 +132,7 @@ struct sh_flctl {
         struct mtd_info         mtd;
         struct nand_chip        chip;
         struct platform_device  *pdev;
+        struct dev_pm_qos_request pm_qos;
         void __iomem            *reg;
 
         uint8_t done_buff[2048 + 64];   /* max size 2048 + 64 */
@@ -149,6 +151,7 @@ struct sh_flctl {
         unsigned page_size:1;   /* NAND page size (0 = 512, 1 = 2048) */
         unsigned hwecc:1;       /* Hardware ECC (0 = disabled, 1 = enabled) */
         unsigned holden:1;      /* Hardware has FLHOLDCR and HOLDEN is set */
+        unsigned qos_request:1; /* QoS request to prevent deep power shutdown */
 };
 
 struct sh_flctl_platform_data {