From: Dmitry Osipenko digetx@gmail.com
commit b906c056b6023c390f18347169071193fda57dde upstream.
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 stable@vger.kernel.org Signed-off-by: Dmitry Osipenko digetx@gmail.com Signed-off-by: Thierry Reding treding@nvidia.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/memory/tegra/mc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/memory/tegra/mc.c +++ b/drivers/memory/tegra/mc.c @@ -280,7 +280,7 @@ static int tegra_mc_setup_latency_allowa 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);