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From: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
To: Adrian Hunter <adrian.hunter@intel.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Kevin Liu <kliu5@marvell.com>,
	Michal Simek <michal.simek@xilinx.com>,
	Suneel Garapati <suneel.garapati@xilinx.com>
Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/7] mmc: sdhci: fix base clock usage in preset value
Date: Thu, 02 Apr 2020 13:54:55 +0200	[thread overview]
Message-ID: <23c3fe72b0ff0eabdbf3a45023a76da1b18a7e90.1585827904.git.mirq-linux@rere.qmqm.pl> (raw)
In-Reply-To: <cover.1585827904.git.mirq-linux@rere.qmqm.pl>

Fixed commit added an unnecessary read of CLOCK_CONTROL. The value read
is overwritten for programmable clock preset, but is carried over for
divided clock preset. This can confuse sdhci_enable_clk() if the register
has enable bits set for some reason at time time of clock calculation.
value to be ORed with enable flags. Remove the read.

Fixes: 52983382c74f ("mmc: sdhci: enhance preset value function")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/mmc/host/sdhci.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 3f716466fcfd..9aa3af5826df 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1765,7 +1765,6 @@ u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
 		if (host->preset_enabled) {
 			u16 pre_val;
 
-			clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
 			pre_val = sdhci_get_preset_value(host);
 			div = FIELD_GET(SDHCI_PRESET_SDCLK_FREQ_MASK, pre_val);
 			if (host->clk_mul &&
-- 
2.20.1


  parent reply	other threads:[~2020-04-02 11:55 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-02 11:54 [PATCH 0/7] SDHCI clock handling fixes and cleanups Michał Mirosław
2020-04-02 11:54 ` [PATCH 3/7] mmc: sdhci: fix SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN Michał Mirosław
2020-04-15 13:06   ` Adrian Hunter
2020-04-15 16:03     ` Michał Mirosław
2020-04-16  7:40       ` Adrian Hunter
2020-04-02 11:54 ` [PATCH 2/7] mmc: sdhci: fix programmable clock config from preset value Michał Mirosław
2020-04-15 12:44   ` Adrian Hunter
2020-04-02 11:54 ` Michał Mirosław [this message]
2020-04-15 12:25   ` [PATCH 1/7] mmc: sdhci: fix base clock usage in " Adrian Hunter
2020-04-15 16:28     ` Michał Mirosław
2020-04-16  8:26       ` Adrian Hunter
2020-04-17 13:55         ` Alan Cooper
2020-04-20  5:31           ` Adrian Hunter
2020-04-02 11:54 ` [PATCH 4/7] mmc: sdhci: move SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN frequency limit Michał Mirosław
2020-04-15 13:16   ` Adrian Hunter
2020-04-15 16:16     ` Michał Mirosław
2020-04-16  7:43       ` Adrian Hunter
2020-04-02 11:54 ` [PATCH 6/7] mmc: sdhci: squash v2/v3+ clock calculation differences Michał Mirosław
2020-04-02 11:54 ` [PATCH 5/7] mmc: sdhci: simplify clock frequency calculation Michał Mirosław
2020-04-03 13:02   ` kbuild test robot
2020-04-03 16:15     ` Michał Mirosław
2020-04-15 13:54   ` Adrian Hunter
2020-04-15 16:45     ` Michał Mirosław
2020-04-02 11:54 ` [PATCH 7/7] mmc: sdhci: respect non-zero div quirk in programmable clock mode Michał Mirosław
2020-04-03 16:03   ` kbuild test robot
2020-04-15  8:52 ` [PATCH 0/7] SDHCI clock handling fixes and cleanups Ulf Hansson

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