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From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH] mci: bcm2835: Don't send MMC_CMD_GO_IDLE_STATE at the end of .init()
Date: Tue, 30 Nov 2021 21:30:26 +0100	[thread overview]
Message-ID: <20211130203026.360693-1-u.kleine-koenig@pengutronix.de> (raw)

The core sends this command anyhow shortly after calling .init(). So
doing it in bcm2835_mci_reset() is only overhead if it succeeds and
if there is a problem it is noticed a tad earlier which has little
benefit compared to the timeout in bcm2835_mci_wait_command_done().

So simplify and drop the transfer.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/mci/mci-bcm2835.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/mci/mci-bcm2835.c b/drivers/mci/mci-bcm2835.c
index 4913dc27f8a3..10f588930cda 100644
--- a/drivers/mci/mci-bcm2835.c
+++ b/drivers/mci/mci-bcm2835.c
@@ -352,10 +352,7 @@ static int bcm2835_mci_reset(struct mci_host *mci, struct device_d *mci_dev)
 	sdhci_write32(&host->sdhci, SDHCI_INT_STATUS,
 			0xFFFFFFFF);
 
-	/*Now write command 0 and see if we get response*/
-	sdhci_write32(&host->sdhci, SDHCI_ARGUMENT, 0x0);
-	sdhci_write32(&host->sdhci, SDHCI_TRANSFER_MODE__COMMAND, 0x0);
-	return bcm2835_mci_wait_command_done(host);
+	return 0;
 }
 
 static int bcm2835_mci_probe(struct device_d *hw_dev)

base-commit: f2dd8896846757829fb3033f41b89be3fc037d78
-- 
2.30.2


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             reply	other threads:[~2021-11-30 20:31 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-30 20:30 Uwe Kleine-König [this message]
2021-12-07  9:08 ` Sascha Hauer

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