Commit b56563d0 authored Aug 12, 2019 by Dmitry Osipenko Committed by Thierry Reding Nov 11, 2019

memory: tegra: Increase handshake timeout on Tegra20

Turned out that it could take over a millisecond under some circumstances,
like running on a very low CPU/memory frequency. TRM says that handshake
happens when there is a "safe" moment, but not explains exactly what that
moment is. Apparently at least memory should be idling and thus the low
frequency should be a reasonable cause for a longer handshake delay.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

parent f541efaa

drivers/memory/tegra/tegra20-emc.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -236,7 +236,7 @@ static int emc_complete_timing_change(struct tegra_emc *emc, bool flush)
		}

		timeout = wait_for_completion_timeout(&emc->clk_handshake_complete,
		usecs_to_jiffies(100));
		msecs_to_jiffies(100));
		if (timeout == 0) {
		dev_err(emc->dev, "EMC-CAR handshake failed\n");
		return -EIO;

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