linux-kernel - [PATCH] usb: gadget: Increase the limit of USB_GADGET_VBUS

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Message-Id: <20250120111702.3738161-1-prashanth.k@oss.qualcomm.com>
Date: Mon, 20 Jan 2025 16:47:02 +0530
From: Prashanth K <prashanth.k@....qualcomm.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Simona Vetter <simona.vetter@...ll.ch>, Takashi Iwai <tiwai@...e.de>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Prashanth K <prashanth.k@....qualcomm.com>
Subject: [PATCH] usb: gadget: Increase the limit of USB_GADGET_VBUS_DRAW to 900mA

Currently CONFIG_USB_GADGET_VBUS_DRAW limits the maximum current
drawn from Vbus to be up to 500mA. However USB gadget operating
in SuperSpeed or higher can draw up to 900mA. Also, MaxPower in
ConfigFS takes its default value from this config. Hence increase
the allowed range of CONFIG_USB_GADGET_VBUS_DRAW to 900mA.

Signed-off-by: Prashanth K <prashanth.k@....qualcomm.com>
---
 drivers/usb/gadget/Kconfig | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 76521555e3c1..904652c37385 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -97,8 +97,8 @@ config USB_GADGET_DEBUG_FS
 	   to conserve kernel memory, say "N".
 
 config USB_GADGET_VBUS_DRAW
-	int "Maximum VBUS Power usage (2-500 mA)"
-	range 2 500
+	int "Maximum VBUS Power usage (2-900 mA)"
+	range 2 900
 	default 2
 	help
 	   Some devices need to draw power from USB when they are
@@ -107,8 +107,11 @@ config USB_GADGET_VBUS_DRAW
 	   such as an AC adapter or batteries.
 
 	   Enter the maximum power your device draws through USB, in
-	   milliAmperes.  The permitted range of values is 2 - 500 mA;
-	   0 mA would be legal, but can make some hosts misbehave.
+	   milliAmperes. The permitted range of values depends on the
+	   connection speed, for SuperSpeed and higher it's 2 - 900 mA,
+	   but connections with High-Speed or slower can draw power
+	   ranging from 2 - 500 mA; 0 mA would be legal, but can make
+	   some hosts misbehave.
 
 	   This value will be used except for system-specific gadget
 	   drivers that have more specific information.
-- 
2.25.1