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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Andrew Jeffery <andrew@aj.id.au>, Joel Stanley <joel@jms.id.au>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Sasha Levin <sashal@kernel.org>,
	linux-aspeed@lists.ozlabs.org, openbmc@lists.ozlabs.org,
	linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH AUTOSEL 5.13 54/85] mmc: sdhci-of-aspeed: Turn down a phase correction warning
Date: Sun,  4 Jul 2021 19:03:49 -0400	[thread overview]
Message-ID: <20210704230420.1488358-54-sashal@kernel.org> (raw)
In-Reply-To: <20210704230420.1488358-1-sashal@kernel.org>

From: Andrew Jeffery <andrew@aj.id.au>

[ Upstream commit a7ab186f60785850b5af1be183867000485ad491 ]

The card timing and the bus frequency are not changed atomically with
respect to calls to the set_clock() callback in the driver. The result
is the driver sees a transient state where there's a mismatch between
the two and thus the inputs to the phase correction calculation
formula are garbage.

Switch from dev_warn() to dev_dbg() to avoid noise in the normal case,
though the change does make bad configurations less likely to be
noticed.

Reported-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20210607013020.85885-1-andrew@aj.id.au
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/mmc/host/sdhci-of-aspeed.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
index d001c51074a0..e4665a438ec5 100644
--- a/drivers/mmc/host/sdhci-of-aspeed.c
+++ b/drivers/mmc/host/sdhci-of-aspeed.c
@@ -150,7 +150,7 @@ static int aspeed_sdhci_phase_to_tap(struct device *dev, unsigned long rate_hz,
 
 	tap = div_u64(phase_period_ps, prop_delay_ps);
 	if (tap > ASPEED_SDHCI_NR_TAPS) {
-		dev_warn(dev,
+		dev_dbg(dev,
 			 "Requested out of range phase tap %d for %d degrees of phase compensation at %luHz, clamping to tap %d\n",
 			 tap, phase_deg, rate_hz, ASPEED_SDHCI_NR_TAPS);
 		tap = ASPEED_SDHCI_NR_TAPS;
-- 
2.30.2


      parent reply	other threads:[~2021-07-04 23:05 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20210704230420.1488358-1-sashal@kernel.org>
2021-07-04 23:03 ` [PATCH AUTOSEL 5.13 51/85] memstick: rtsx_usb_ms: fix UAF Sasha Levin
2021-07-04 23:03 ` [PATCH AUTOSEL 5.13 52/85] mmc: sdhci-sprd: use sdhci_sprd_writew Sasha Levin
2021-07-04 23:03 ` [PATCH AUTOSEL 5.13 53/85] mmc: via-sdmmc: add a check against NULL pointer dereference Sasha Levin
2021-07-04 23:03 ` Sasha Levin [this message]

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