linux-kernel - [PATCH RFC 07/12] mmc: mmci: Qcomm: Add 3 clock cycle delay after each register write

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 21 Apr 2014 22:48:29 +0100
From:	srinivas.kandagatla@...aro.org
To:	linux-mmc@...r.kernel.org
Cc:	Russell King <linux@....linux.org.uk>,
	Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-kernel@...r.kernel.org, agross@...cinc.com,
	linux-arm-msm@...r.kernel.org,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH RFC 07/12] mmc: mmci: Qcomm: Add 3 clock cycle delay after each register write

From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

This patch adds a 3 clock cycle delay required after writing to controller
registers on Qualcomm SOCs. Without this delay cards are either not detected
or fails as soon as card is put into data transfer mode.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/mmc/host/mmci.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 86bf330..2dc7581 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -168,6 +168,7 @@ static struct variant_data variant_qcom = {
 	.fifosize		= 16 * 4,
 	.fifohalfsize		= 8 * 4,
 	.clkreg			= MCI_CLK_ENABLE,
+	.reg_write_delay	= 3,
 	.blksz_datactrl4	= true,
 	.datalength_bits	= 24,
 	.blksz_datactrl4	= true,
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/