arm: tegra14x: bb: override DSR when EMC floor is set

Dynamic Self Refresh (DSR) feature in EMC affects BBC's latency.
Override DSR when min EMC frequency is set and enable it
when BBC becomes idle.

Change-Id: I8554910c62bc35a2887e6ed2e49b3240944028dc
Signed-off-by: Vinayak Pane <vpane@nvidia.com>
Reviewed-on: http://git-master/r/224045
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Steve Lin <stlin@nvidia.com>

diff --git a/arch/arm/mach-tegra/tegra_bb.c b/arch/arm/mach-tegra/tegra_bb.c
index e27d2ffb8cc2a015ecd9b968827f772b24747eeb..5e4c1750fc33b09e8532d57875476362bdd35889 100644 (file)
--- a/arch/arm/mach-tegra/tegra_bb.c
+++ b/arch/arm/mach-tegra/tegra_bb.c
@@ -37,6 +37,7 @@
 #include "clock.h"
 #include "iomap.h"
 #include "sleep.h"
+#include "tegra_emc.h"
 
 /* BB mailbox offset */
 #define TEGRA_BB_REG_MAILBOX (0x0)
@@ -889,6 +890,7 @@ static void tegra_bb_emc_dvfs(struct work_struct *work)
 
                /* going from 0 to high */
                clk_prepare_enable(bb->emc_clk);
+               tegra_emc_dsr_override(TEGRA_EMC_DSR_OVERRIDE);
                clk_set_rate(bb->emc_clk, BBC_MC_MIN_FREQ);
                pr_debug("bbc setting floor to %d\n", BBC_MC_MIN_FREQ/1000000);
 
@@ -903,6 +905,7 @@ static void tegra_bb_emc_dvfs(struct work_struct *work)
                spin_unlock_irqrestore(&bb->lock, flags);
 
                /* going from high to 0 */
+               tegra_emc_dsr_override(TEGRA_EMC_DSR_NORMAL);
                clk_set_rate(bb->emc_clk, 0);
                clk_disable_unprepare(bb->emc_clk);
                pr_debug("bbc removing emc floor\n");