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

[Dmitry Baryshkov]

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@xxxxxxxxxxxxxxxx>
---
 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