From b906c056b6023c390f18347169071193fda57dde Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Fri, 12 Apr 2019 01:12:48 +0300 Subject: memory: tegra: Fix integer overflow on tick value calculation Multiplying the Memory Controller clock rate by the tick count results in an integer overflow and in result the truncated tick value is being programmed into hardware, such that the GR3D memory client performance is reduced by two times. Cc: stable Signed-off-by: Dmitry Osipenko Signed-off-by: Thierry Reding --- drivers/memory/tegra/mc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/memory/tegra') diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c index 1735e23dbc28..483ac3c1a762 100644 --- a/drivers/memory/tegra/mc.c +++ b/drivers/memory/tegra/mc.c @@ -285,7 +285,7 @@ static int tegra_mc_setup_latency_allowance(struct tegra_mc *mc) u32 value; /* compute the number of MC clock cycles per tick */ - tick = mc->tick * clk_get_rate(mc->clk); + tick = (unsigned long long)mc->tick * clk_get_rate(mc->clk); do_div(tick, NSEC_PER_SEC); value = readl(mc->regs + MC_EMEM_ARB_CFG); -- cgit v1.2.3