ARM: tegra: wifi dpd control for reset

Wifi On/Off needs to toggle GPIO pins under SDMMC that could be
in IO DPD mode.

bug 1021526

Change-Id: If514059372d2242c6f6512b30534536cbff455dd
Signed-off-by: Bitan Biswas <bbiswas@nvidia.com>
Reviewed-on: http://git-master/r/118940
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Pavan Kunapuli <pkunapuli@nvidia.com>
Tested-by: Pavan Kunapuli <pkunapuli@nvidia.com>

3 files changed, 61 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/board-cardhu-sdhci.c b/arch/arm/mach-tegra/board-cardhu-sdhci.c
index d8be9fe6747f..df7177fb34a7 100644
--- a/arch/arm/mach-tegra/board-cardhu-sdhci.c
+++ b/arch/arm/mach-tegra/board-cardhu-sdhci.c
@@ -28,6 +28,7 @@
 #include <mach/irqs.h>
 #include <mach/iomap.h>
 #include <mach/sdhci.h>
+#include <mach/io_dpd.h>
 
 #include "gpio-names.h"
 #include "board.h"
@@ -251,11 +252,31 @@ static int cardhu_wifi_set_carddetect(int val)
 
 static int cardhu_wifi_power(int on)
 {
+	struct tegra_io_dpd *sd_dpd;
+
 	pr_debug("%s: %d\n", __func__, on);
+
+	/*
+	 * FIXME : we need to revisit IO DPD code
+	 * on how should multiple pins under DPD get controlled
+	 *
+	 * cardhu GPIO WLAN enable is part of SDMMC3 pin group
+	 */
+	sd_dpd = tegra_io_dpd_get(&tegra_sdhci_device2.dev);
+	if (sd_dpd) {
+		mutex_lock(&sd_dpd->delay_lock);
+		tegra_io_dpd_disable(sd_dpd);
+		mutex_unlock(&sd_dpd->delay_lock);
+	}
 	gpio_set_value(CARDHU_WLAN_PWR, on);
 	mdelay(100);
 	gpio_set_value(CARDHU_WLAN_RST, on);
 	mdelay(200);
+	if (sd_dpd) {
+		mutex_lock(&sd_dpd->delay_lock);
+		tegra_io_dpd_enable(sd_dpd);
+		mutex_unlock(&sd_dpd->delay_lock);
+	}
 
 	return 0;
 }
diff --git a/arch/arm/mach-tegra/board-enterprise-sdhci.c b/arch/arm/mach-tegra/board-enterprise-sdhci.c
index 7a5632601fe6..8032f8105bed 100644
--- a/arch/arm/mach-tegra/board-enterprise-sdhci.c
+++ b/arch/arm/mach-tegra/board-enterprise-sdhci.c
@@ -27,6 +27,7 @@
 #include <mach/irqs.h>
 #include <mach/iomap.h>
 #include <mach/sdhci.h>
+#include <mach/io_dpd.h>
 
 #include "gpio-names.h"
 #include "board.h"
@@ -221,11 +222,31 @@ static int enterprise_wifi_set_carddetect(int val)
 
 static int enterprise_wifi_power(int on)
 {
+	struct tegra_io_dpd *sd_dpd;
+
 	pr_debug("%s: %d\n", __func__, on);
+
+	/*
+	 * FIXME : we need to revisit IO DPD code
+	 * on how should multiple pins under DPD get controlled
+	 *
+	 * enterprise GPIO WLAN enable is part of SDMMC1 pin group
+	 */
+	sd_dpd = tegra_io_dpd_get(&tegra_sdhci_device0.dev);
+	if (sd_dpd) {
+		mutex_lock(&sd_dpd->delay_lock);
+		tegra_io_dpd_disable(sd_dpd);
+		mutex_unlock(&sd_dpd->delay_lock);
+	}
 	gpio_set_value(ENTERPRISE_WLAN_PWR, on);
 	mdelay(100);
 	gpio_set_value(ENTERPRISE_WLAN_RST, on);
 	mdelay(200);
+	if (sd_dpd) {
+		mutex_lock(&sd_dpd->delay_lock);
+		tegra_io_dpd_enable(sd_dpd);
+		mutex_unlock(&sd_dpd->delay_lock);
+	}
 
 	return 0;
 }
diff --git a/arch/arm/mach-tegra/board-kai-sdhci.c b/arch/arm/mach-tegra/board-kai-sdhci.c
index 0fa39ccf475d..70ba7bcdb202 100644
--- a/arch/arm/mach-tegra/board-kai-sdhci.c
+++ b/arch/arm/mach-tegra/board-kai-sdhci.c
@@ -28,6 +28,7 @@
 #include <mach/irqs.h>
 #include <mach/iomap.h>
 #include <mach/sdhci.h>
+#include <mach/io_dpd.h>
 
 #include "gpio-names.h"
 #include "board.h"
@@ -202,8 +203,21 @@ static int kai_wifi_set_carddetect(int val)
 
 static int kai_wifi_power(int power_on)
 {
+	struct tegra_io_dpd *sd_dpd;
 	pr_err("Powering %s wifi\n", (power_on ? "on" : "off"));
 
+	/*
+	 * FIXME : we need to revisit IO DPD code
+	 * on how should multiple pins under DPD get controlled
+	 *
+	 * kai GPIO WLAN enable is part of SDMMC3 pin group
+	 */
+	sd_dpd = tegra_io_dpd_get(&tegra_sdhci_device2.dev);
+	if (sd_dpd) {
+		mutex_lock(&sd_dpd->delay_lock);
+		tegra_io_dpd_disable(sd_dpd);
+		mutex_unlock(&sd_dpd->delay_lock);
+	}
 	if (power_on) {
 		gpio_set_value(KAI_WLAN_EN, 1);
 		mdelay(15);
@@ -214,6 +228,11 @@ static int kai_wifi_power(int power_on)
 	} else {
 		gpio_set_value(KAI_WLAN_EN, 0);
 	}
+	if (sd_dpd) {
+		mutex_lock(&sd_dpd->delay_lock);
+		tegra_io_dpd_enable(sd_dpd);
+		mutex_unlock(&sd_dpd->delay_lock);
+	}
 
 	return 0;
 }