linux-kernel - [PATCH] mmc: sdhci-of-aspeed: Turn down a phase correction warning

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Message-Id: <20210607013020.85885-1-andrew@aj.id.au>
Date:   Mon,  7 Jun 2021 11:00:20 +0930
From:   Andrew Jeffery <andrew@...id.au>
To:     linux-mmc@...r.kernel.org
Cc:     adrian.hunter@...el.com, ulf.hansson@...aro.org, joel@....id.au,
        linux-aspeed@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        steven_lee@...eedtech.com
Subject: [PATCH] mmc: sdhci-of-aspeed: Turn down a phase correction warning

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@....id.au>
Signed-off-by: Andrew Jeffery <andrew@...id.au>
---
 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