linux-kernel - [PATCH 11/20] phy: da8xx-usb: Configure CFGCHIP2 to support OTG workaround

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Message-ID: <1479475723-4857-12-git-send-email-kishon@ti.com>
Date:   Fri, 18 Nov 2016 18:58:34 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     <gregkh@...uxfoundation.org>
CC:     <kishon@...com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 11/20] phy: da8xx-usb: Configure CFGCHIP2 to support OTG workaround

From: Alexandre Bailon <abailon@...libre.com>

If we configure the da8xx OTG phy in OTG mode, neither device or host
mode will work. That is because the PHY is not able to detect and notify
the driver that value of ID pin changed.
To work despite this hardware limitation, the da8xx glue implement a
workaround.
But to work, the workaround require the VBUS sense and the session end
comparator to enabled.
Enable them if the phy is configured in OTG mode.

Signed-off-by: Alexandre Bailon <abailon@...libre.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/phy/phy-da8xx-usb.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/phy/phy-da8xx-usb.c b/drivers/phy/phy-da8xx-usb.c
index c85fb0b..1b82bff 100644
--- a/drivers/phy/phy-da8xx-usb.c
+++ b/drivers/phy/phy-da8xx-usb.c
@@ -23,6 +23,8 @@
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 
+#define PHY_INIT_BITS	(CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN)
+
 struct da8xx_usb_phy {
 	struct phy_provider	*phy_provider;
 	struct phy		*usb11_phy;
@@ -208,6 +210,9 @@ static int da8xx_usb_phy_probe(struct platform_device *pdev)
 			dev_warn(dev, "Failed to create usb20 phy lookup\n");
 	}
 
+	regmap_write_bits(d_phy->regmap, CFGCHIP(2),
+			  PHY_INIT_BITS, PHY_INIT_BITS);
+
 	return 0;
 }
 
-- 
1.7.9.5