linux-kernel - [PATCH v2 2/2] usb: dwc2: prevent core PHY initialization on Rockchip

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Message-Id: <20221206-dwc2-gadget-dual-role-v2-2-0de821615dd3@theobroma-systems.com>
Date:   Fri, 16 Dec 2022 17:29:29 +0100
From:   Quentin Schulz <foss+kernel@...il.net>
To:     Minas Harutyunyan <hminas@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Quentin Schulz <foss+kernel@...il.net>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bin Yang <yangbin@...k-chips.com>,
        Quentin Schulz <quentin.schulz@...obroma-systems.com>
Subject: [PATCH v2 2/2] usb: dwc2: prevent core PHY initialization on Rockchip

From: Quentin Schulz <quentin.schulz@...obroma-systems.com>

In Rockchip vendor kernel, the core PHY initialization is disabled with
the following justification:

 The usb phys need to be controlled dynamically on some Rockchip SoCs.
 So set the new HCD flag which prevents USB core from trying to manage
 our phys.

This is required to get USB gadget working in dual-role mode on Ringneck
PX30 SoM on a Haikou Devkit.

Cc: Bin Yang <yangbin@...k-chips.com>
Signed-off-by: Quentin Schulz <quentin.schulz@...obroma-systems.com>
---
 drivers/usb/dwc2/params.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
index 9ed9fd956940..9095437b3236 100644
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -117,6 +117,7 @@ static void dwc2_set_rk_params(struct dwc2_hsotg *hsotg)
 	p->lpm_clock_gating = false;
 	p->besl = false;
 	p->hird_threshold_en = false;
+	p->hcd_skip_phy_initialization = 1;
 }
 
 static void dwc2_set_ltq_params(struct dwc2_hsotg *hsotg)

-- 
2.38.1