ARM: shmobile: Specify device latencies for Mackerel devices directly

The results of adaptive latency computations in
GENPD_DEV_TIMED_CALLBACK() show that the start/stop and save/restore
state latencies of all devices on the Mackerel board I have tried are
a little below 250 us.  Therefore, if the 250 us is used as the
common initial value of the latency fields in struct gpd_timing_data
for all devices on Mackerel, the latency values will never have to
change at run time and there won't be any overhead related to
re-computation of the corresponding PM QoS data.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>

1 files changed, 19 insertions, 12 deletions

diff --git a/arch/arm/mach-shmobile/board-mackerel.c b/arch/arm/mach-shmobile/board-mackerel.c
index 954b02e3bb18..c64fc40351da 100644
--- a/arch/arm/mach-shmobile/board-mackerel.c
+++ b/arch/arm/mach-shmobile/board-mackerel.c
@@ -1407,8 +1407,15 @@ static struct i2c_board_info i2c1_devices[] = {
 #define GPIO_PORT168CR  0xE60520A8
 #define SRCR4           0xe61580bc
 #define USCCR1          0xE6058144
+#define DEV_LATENCY_NS  250000
 static void __init mackerel_init(void)
 {
+        struct gpd_timing_data latencies = {
+                .stop_latency_ns = DEV_LATENCY_NS,
+                .start_latency_ns = DEV_LATENCY_NS,
+                .save_state_latency_ns = DEV_LATENCY_NS,
+                .restore_state_latency_ns = DEV_LATENCY_NS,
+        };
         u32 srcr4;
         struct clk *clk;
 
@@ -1623,20 +1630,20 @@ static void __init mackerel_init(void)
 
         platform_add_devices(mackerel_devices, ARRAY_SIZE(mackerel_devices));
 
-        rmobile_add_device_to_domain("A4LC", &lcdc_device);
-        rmobile_add_device_to_domain("A4LC", &hdmi_lcdc_device);
-        rmobile_add_device_to_domain("A4LC", &meram_device);
-        rmobile_add_device_to_domain("A4MP", &fsi_device);
-        rmobile_add_device_to_domain("A3SP", &usbhs0_device);
-        rmobile_add_device_to_domain("A3SP", &usbhs1_device);
-        rmobile_add_device_to_domain("A3SP", &nand_flash_device);
-        rmobile_add_device_to_domain("A3SP", &sh_mmcif_device);
-        rmobile_add_device_to_domain("A3SP", &sdhi0_device);
+        rmobile_add_device_to_domain_td("A4LC", &lcdc_device, &latencies);
+        rmobile_add_device_to_domain_td("A4LC", &hdmi_lcdc_device, &latencies);
+        rmobile_add_device_to_domain_td("A4LC", &meram_device, &latencies);
+        rmobile_add_device_to_domain_td("A4MP", &fsi_device, &latencies);
+        rmobile_add_device_to_domain_td("A3SP", &usbhs0_device, &latencies);
+        rmobile_add_device_to_domain_td("A3SP", &usbhs1_device, &latencies);
+        rmobile_add_device_to_domain_td("A3SP", &nand_flash_device, &latencies);
+        rmobile_add_device_to_domain_td("A3SP", &sh_mmcif_device, &latencies);
+        rmobile_add_device_to_domain_td("A3SP", &sdhi0_device, &latencies);
 #if !defined(CONFIG_MMC_SH_MMCIF) && !defined(CONFIG_MMC_SH_MMCIF_MODULE)
-        rmobile_add_device_to_domain("A3SP", &sdhi1_device);
+        rmobile_add_device_to_domain_td("A3SP", &sdhi1_device, &latencies);
 #endif
-        rmobile_add_device_to_domain("A3SP", &sdhi2_device);
-        rmobile_add_device_to_domain("A4R", &ceu_device);
+        rmobile_add_device_to_domain_td("A3SP", &sdhi2_device, &latencies);
+        rmobile_add_device_to_domain_td("A4R", &ceu_device, &latencies);
 
         hdmi_init_pm_clock();
         sh7372_pm_init();