From: Dmitry Osipenko <digetx@gmail.com>
To: Rob Herring <robh+dt@kernel.org>,
Michael Turquette <mturquette@baylibre.com>,
Joseph Lo <josephl@nvidia.com>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Peter De Schrijver <pdeschrijver@nvidia.com>,
Prashant Gaikwad <pgaikwad@nvidia.com>,
Stephen Boyd <sboyd@kernel.org>
Cc: devicetree@vger.kernel.org, linux-clk@vger.kernel.org,
linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v9 07/15] memory: tegra20-emc: Increase handshake timeout
Date: Tue, 30 Jul 2019 19:56:10 +0300 [thread overview]
Message-ID: <20190730165618.10122-8-digetx@gmail.com> (raw)
In-Reply-To: <20190730165618.10122-1-digetx@gmail.com>
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>
---
drivers/memory/tegra/tegra20-emc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c
index 25a6aad6a7a9..da75efc632c7 100644
--- a/drivers/memory/tegra/tegra20-emc.c
+++ b/drivers/memory/tegra/tegra20-emc.c
@@ -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;
--
2.22.0
next prev parent reply other threads:[~2019-07-30 16:59 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-30 16:56 [PATCH v9 00/15] memory: tegra: Introduce Tegra30 EMC driver Dmitry Osipenko
2019-07-30 16:56 ` [PATCH v9 01/15] clk: tegra20/30: Add custom EMC clock implementation Dmitry Osipenko
2019-08-01 11:10 ` Dmitry Osipenko
2019-07-30 16:56 ` [PATCH v9 02/15] memory: tegra20-emc: Drop setting EMC rate to max on probe Dmitry Osipenko
2019-07-30 16:56 ` [PATCH v9 03/15] memory: tegra20-emc: Adapt for clock driver changes Dmitry Osipenko
2019-07-30 16:56 ` [PATCH v9 04/15] memory: tegra20-emc: Include io.h instead of iopoll.h Dmitry Osipenko
2019-07-30 16:56 ` [PATCH v9 05/15] memory: tegra20-emc: Pre-configure debug register Dmitry Osipenko
2019-07-30 16:56 ` [PATCH v9 06/15] memory: tegra20-emc: Print a brief info message about the timings Dmitry Osipenko
2019-07-30 16:56 ` Dmitry Osipenko [this message]
2019-07-30 16:56 ` [PATCH v9 08/15] memory: tegra20-emc: wait_for_completion_timeout() doesn't return error Dmitry Osipenko
2019-07-30 16:56 ` [PATCH v9 09/15] dt-bindings: memory: tegra30: Convert to Tegra124 YAML Dmitry Osipenko
2019-08-01 16:25 ` Rob Herring
2019-08-01 17:52 ` Dmitry Osipenko
2019-08-01 18:06 ` Rob Herring
2019-07-30 16:56 ` [PATCH v9 10/15] dt-bindings: memory: Add binding for NVIDIA Tegra30 Memory Controller Dmitry Osipenko
2019-07-30 16:56 ` [PATCH v9 11/15] dt-bindings: memory: Add binding for NVIDIA Tegra30 External " Dmitry Osipenko
2019-08-01 11:05 ` Dmitry Osipenko
2019-08-01 18:11 ` Rob Herring
2019-08-01 18:35 ` Dmitry Osipenko
2019-07-30 16:56 ` [PATCH v9 12/15] memory: tegra: Introduce Tegra30 EMC driver Dmitry Osipenko
2019-07-30 16:56 ` [PATCH v9 13/15] memory: tegra: Ensure timing control debug features are disabled Dmitry Osipenko
2019-07-30 16:56 ` [PATCH v9 14/15] memory: tegra: Consolidate registers definition into common header Dmitry Osipenko
2019-07-30 16:56 ` [PATCH v9 15/15] ARM: dts: tegra30: Add External Memory Controller node Dmitry Osipenko
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