[PATCH 08/10] usb: chipidea: host: calibrate the PHY after starting the host

From: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
To: Bartosz Golaszewski <brgl@kernel.org>,
	Bjorn Andersson <andersson@kernel.org>,
	Linus Walleij <linusw@kernel.org>, Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Xu Yang <xu.yang_2@nxp.com>, Peng Fan <peng.fan@nxp.com>,
	Vinod Koul <vkoul@kernel.org>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	Peter Chen <peter.chen@kernel.org>,
	Pavankumar Kondeti <quic_pkondeti@quicinc.com>,
	Stephen Boyd <stephen.boyd@linaro.org>,
	Konrad Dybcio <konradybcio@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>,
	linux-arm-msm@vger.kernel.org, linux-gpio@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-usb@vger.kernel.org, linux-phy@lists.infradead.org,
	Greg Kroah-Hartman <gregkh@suse.de>,
	Peter Chen <peter.chen@nxp.com>
Subject: [PATCH 08/10] usb: chipidea: host: calibrate the PHY after starting the host
Date: Mon, 10 Aug 2026 18:42:12 +0300	[thread overview]
Message-ID: <20260810-msm8974-usb-hsic-v1-8-e5f93ea76ffa@oss.qualcomm.com> (raw)
In-Reply-To: <20260810-msm8974-usb-hsic-v1-0-e5f93ea76ffa@oss.qualcomm.com>

Some PHYs need a final programming step after the host controller is
up: the Qualcomm HSIC PHY latches the device connect at the moment
HSIC mode is engaged, so that write must happen with the root port
already running, or an already-connected HSIC device (the strobe/data
lines have no hotplug) is never seen. The generic PHY framework
provides phy_calibrate() for exactly this kind of post-init fixup and
dwc3 already calls it; the chipidea host does not, leaving no place
for such PHY work.

Call phy_calibrate() once the HCD has been added, next to the existing
i.MX HSIC active-event hook which serves the same purpose. PHYs
without a calibrate op are unaffected.

Assisted-by: Claude:claude-fable-5
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/usb/chipidea/host.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
index ced6076a8248..62bb2999edb6 100644
--- a/drivers/usb/chipidea/host.c
+++ b/drivers/usb/chipidea/host.c
@@ -15,6 +15,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/string_choices.h>
 #include <linux/pinctrl/consumer.h>
+#include <linux/phy/phy.h>
 
 #include "../host/ehci.h"
 
@@ -192,6 +193,9 @@ static int host_start(struct ci_hdrc *ci)
 			(ci->platdata->flags & CI_HDRC_IMX_IS_HSIC))
 			ci->platdata->notify_event
 				(ci, CI_HDRC_IMX_HSIC_ACTIVE_EVENT);
+
+		if (ci->phy)
+			phy_calibrate(ci->phy);
 	}
 
 	return ret;

-- 
2.47.3


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