linux-kernel - [PATCH 08/11] sdhci: Add support for hosts that don't specify clocks in the cap. register

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 for Android: free password hash cracker in your pocket

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

Date:	Fri, 6 Feb 2009 21:06:57 +0300
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Pierre Ossman <drzeus-sdhci@...eus.cx>
Cc:	Ben Dooks <ben-linux@...ff.org>, Arnd Bergmann <arnd@...db.de>,
	Kumar Gala <galak@...nel.crashing.org>,
	Liu Dave <DaveLiu@...escale.com>, sdhci-devel@...t.drzeus.cx,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: [PATCH 08/11] sdhci: Add support for hosts that don't specify
	clocks in the cap. register

FSL eSDHC hosts don't provide clocks bits in the capabilities register,
instead we're getting clocks values from the device tree.

There is somewhat similar change[1] from Ben Dooks, the change adds
callbacks for getting the clocks. But for eSDHC the callbacks are
superfluous, since the clocks are static.

[1] http://lkml.org/lkml/2008/12/2/157

Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
---
 drivers/mmc/host/sdhci.c |   31 +++++++++++++++----------------
 1 files changed, 15 insertions(+), 16 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index ede3790..0293368 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1703,24 +1703,23 @@ int sdhci_add_host(struct sdhci_host *host)
 		mmc_dev(host->mmc)->dma_mask = &host->dma_mask;
 	}
 
-	host->max_clk =
-		(caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
-	if (host->max_clk == 0) {
-		printk(KERN_ERR "%s: Hardware doesn't specify base clock "
-			"frequency.\n", mmc_hostname(mmc));
-		return -ENODEV;
+	if (!host->max_clk) {
+		host->max_clk = (caps & SDHCI_CLOCK_BASE_MASK) >>
+						SDHCI_CLOCK_BASE_SHIFT;
+		if (host->max_clk == 0) {
+			printk(KERN_ERR "%s: Hardware doesn't specify base "
+				"clock frequency.\n", mmc_hostname(mmc));
+			return -ENODEV;
+		}
+		host->max_clk *= 1000000;
 	}
-	host->max_clk *= 1000000;
 
-	host->timeout_clk =
-		(caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
-	if (host->timeout_clk == 0) {
-		printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
-			"frequency.\n", mmc_hostname(mmc));
-		return -ENODEV;
+	if (!host->timeout_clk) {
+		host->timeout_clk = (caps & SDHCI_TIMEOUT_CLK_MASK) >>
+						SDHCI_TIMEOUT_CLK_SHIFT;
+		if (caps & SDHCI_TIMEOUT_CLK_UNIT)
+			host->timeout_clk *= 1000;
 	}
-	if (caps & SDHCI_TIMEOUT_CLK_UNIT)
-		host->timeout_clk *= 1000;
 
 	/*
 	 * Set host parameters.
-- 
1.5.6.5

--
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/