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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2012-02-23 11:22:29 +0100
committerChris Ball <cjb@laptop.org>2012-03-04 12:18:40 -0500
commitc84f15aed29d89995fd50ef37e19c7b88019d78f (patch)
tree865ac9b487b99105efad7eedfa1a6b96776e8fd7
parent24e1511f675b97a76488b89017a40909be731b63 (diff)
downloadvexpress-lsk-c84f15aed29d89995fd50ef37e19c7b88019d78f.tar.gz
mmc: core: fix regression: set default clock gating delay to 0
A recent commit "mmc: core: Use delayed work in clock gating framework" (597dd9d79cfbbb1) introduced a default 200ms delay before clock gating actually takes place. This means that every time an MMC interface becomes idle it first stays on for 200ms before gating its clock. This leads to increased power consumption and is therefore a clear regression. This patch restores the original behaviour by setting the default delay to 0. Users prioritising throughput over power efficiency can still modify the delay via sysfs. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
-rw-r--r--drivers/mmc/core/host.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 30055f2b0d4..c3704e293a7 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -238,10 +238,10 @@ static inline void mmc_host_clk_init(struct mmc_host *host)
/* Hold MCI clock for 8 cycles by default */
host->clk_delay = 8;
/*
- * Default clock gating delay is 200ms.
+ * Default clock gating delay is 0ms to avoid wasting power.
* This value can be tuned by writing into sysfs entry.
*/
- host->clkgate_delay = 200;
+ host->clkgate_delay = 0;
host->clk_gated = false;
INIT_DELAYED_WORK(&host->clk_gate_work, mmc_host_clk_gate_work);
spin_lock_init(&host->clk_lock);