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usb: musb: fix MUSB_QUIRK_B_DISCONNECT_99 handling
In commit92af4fc6ec
("usb: musb: Fix suspend with devices connected for a64"), the logic to support the MUSB_QUIRK_B_DISCONNECT_99 quirk was modified to only conditionally schedule the musb->irq_work delayed work. This commit badly breaks ECM Gadget on AM335X. Indeed, with this commit, one can observe massive packet loss: $ ping 192.168.0.100 ... 15 packets transmitted, 3 received, 80% packet loss, time 14316ms Reverting this commit brings back a properly functioning ECM Gadget. An analysis of the commit seems to indicate that a mistake was made: the previous code was not falling through into the MUSB_QUIRK_B_INVALID_VBUS_91, but now it is, unless the condition is taken. Changing the logic to be as it was before the problematic commit *and* only conditionally scheduling musb->irq_work resolves the regression: $ ping 192.168.0.100 ... 64 packets transmitted, 64 received, 0% packet loss, time 64475ms Fixes:92af4fc6ec
("usb: musb: Fix suspend with devices connected for a64") Cc: stable@vger.kernel.org Tested-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Tested-by: Drew Fustini <drew@beagleboard.org> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Link: https://lore.kernel.org/r/20210528140446.278076-1-thomas.petazzoni@bootlin.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 1 additions and 2 deletions
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@ -2009,9 +2009,8 @@ static void musb_pm_runtime_check_session(struct musb *musb)
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schedule_delayed_work(&musb->irq_work,
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msecs_to_jiffies(1000));
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musb->quirk_retries--;
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break;
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}
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fallthrough;
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break;
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case MUSB_QUIRK_B_INVALID_VBUS_91:
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if (musb->quirk_retries && !musb->flush_irq_work) {
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musb_dbg(musb,
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