From: Colin Cross <ccross@android.com>
Date: Tue, 28 Dec 2010 22:56:19 +0000 (-0800)
Subject: ARM: tegra: stingray: Set the sdmmc tap delay for wifi
X-Git-Tag: firefly_0821_release~9834^2~211
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f9ae9d60f43221229f99cac4e04a5fb4d3b6bd0b;p=firefly-linux-kernel-4.4.55.git

ARM: tegra: stingray: Set the sdmmc tap delay for wifi

Change-Id: Ia9b029738945c14f2fa6e6077cd20d4e191c2537
Signed-off-by: Colin Cross <ccross@android.com>
---

diff --git a/arch/arm/mach-tegra/board-stingray.c b/arch/arm/mach-tegra/board-stingray.c
index e366b8a59823..baa36db96688 100644
--- a/arch/arm/mach-tegra/board-stingray.c
+++ b/arch/arm/mach-tegra/board-stingray.c
@@ -899,6 +899,16 @@ static void __init tegra_stingray_init(void)
 	tegra_init_suspend(&stingray_suspend);
 	stingray_init_emc();
 
+	/* Set the SDMMC2 (wifi) tap delay to 6.  This value is determined
+	 * based on propagation delay on the PCB traces. */
+	clk = clk_get_sys("sdhci-tegra.1", NULL);
+	if (!IS_ERR(clk)) {
+		tegra_sdmmc_tap_delay(clk, 6);
+		clk_put(clk);
+	} else {
+		pr_err("Failed to set wifi sdmmc tap delay\n");
+	}
+
 	/* Stingray has a USB switch that disconnects the usb port from the T20
 	   unless a factory cable is used, the factory jumper is set, or the
 	   usb_data_en gpio is set.