From 9622b684a84f08e7e71d8f85c2d95d767b99b0b9 Mon Sep 17 00:00:00 2001 From: Tomeu Vizoso Date: Thu, 12 Mar 2015 15:48:10 +0100 Subject: [PATCH] memory: tegra: Disable ARBITRATION_EMEM interrupt As this interrupt is just for development purposes, as the TRM says, and the sheer amount of interrupts fired can seriously disrupt userspace when testing the lower frequencies supported by the EMC. From the TRM: "There is one performance warning type interrupt: ARBITRATION_EMEM. It fires when the MC detects that a request has been pending in the Row Sorter long enough to hit the DEADLOCK_PREVENTION_SLACK_THRESHOLD. In addition to true performance problems, this interrupt may fire in situations such as clock-change where the EMC backpressures pending traffic for long periods of time. This interrupt helps developers identify and debug performance issues and configuration issues." Signed-off-by: Tomeu Vizoso Signed-off-by: Thierry Reding --- drivers/memory/tegra/mc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c index 4e3a886816a4..19f67743215e 100644 --- a/drivers/memory/tegra/mc.c +++ b/drivers/memory/tegra/mc.c @@ -409,8 +409,8 @@ static int tegra_mc_probe(struct platform_device *pdev) value = MC_INT_DECERR_MTS | MC_INT_SECERR_SEC | MC_INT_DECERR_VPR | MC_INT_INVALID_APB_ASID_UPDATE | MC_INT_INVALID_SMMU_PAGE | - MC_INT_ARBITRATION_EMEM | MC_INT_SECURITY_VIOLATION | - MC_INT_DECERR_EMEM; + MC_INT_SECURITY_VIOLATION | MC_INT_DECERR_EMEM; + mc_writel(mc, value, MC_INTMASK); return 0; -- 2.39.5