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From:   Quentin Schulz <foss+kernel@0leil.net>
To:     Minas Harutyunyan <hminas@synopsys.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Quentin Schulz <quentin.schulz@theobroma-systems.com>,
        linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
        William Wu <william.wu@rock-chips.com>,
        Bin Yang <yangbin@rock-chips.com>,
        Frank Wang <frank.wang@rock-chips.com>
Subject: [PATCH 1/3] usb: dwc2: disable lpm feature on Rockchip SoCs
Date:   Wed,  7 Dec 2022 14:19:16 +0100
Message-Id: <20221206-dwc2-gadget-dual-role-v1-1-36515e1092cd@theobroma-systems.com>
In-Reply-To: <20221206-dwc2-gadget-dual-role-v1-0-36515e1092cd@theobroma-systems.com>
References: <20221206-dwc2-gadget-dual-role-v1-0-36515e1092cd@theobroma-systems.com>
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From: Quentin Schulz <quentin.schulz@theobroma-systems.com>

LPM feature of DWC2 module integrated in Rockchip SoCs doesn't work
properly or needs some additional handling, so disable it for now.
Without disabling LPM feature, the USB ADB communication fail with
the following error log:

dwc2 ff580000.usb: new address 27
dwc2 ff580000.usb: Failed to exit L1 sleep state in 200us.
dwc2 ff580000.usb: dwc2_hsotg_send_reply: cannot queue req
dwc2 ff580000.usb: dwc2_hsotg_process_req_status: failed to send reply
dwc2 ff580000.usb: dwc2_hsotg_enqueue_setup: failed queue (-11)
dwc2 ff580000.usb: Failed to exit L1 sleep state in 200us.

Signed-off-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
[diff vs vendor kernel: added lpm_clock_gating, besl and
 hird_threshold_en settings as seen in  commit 53febc956900 ("usb: dwc2:
 disable Link Power Management on STM32MP15 HS OTG")]
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
---
 drivers/usb/dwc2/params.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
index 8eab5f38b1101..9ed9fd9569404 100644
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -113,6 +113,10 @@ static void dwc2_set_rk_params(struct dwc2_hsotg *hsotg)
 	p->ahbcfg = GAHBCFG_HBSTLEN_INCR16 <<
 		GAHBCFG_HBSTLEN_SHIFT;
 	p->power_down = DWC2_POWER_DOWN_PARAM_NONE;
+	p->lpm = false;
+	p->lpm_clock_gating = false;
+	p->besl = false;
+	p->hird_threshold_en = false;
 }
 
 static void dwc2_set_ltq_params(struct dwc2_hsotg *hsotg)

-- 
b4 0.10.1