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usb: dwc2: return correct frame counts with high-speed host

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The HFNUM register increments on every microframe in HS mode, and USB
device drivers expect the returned frame count to relate to the overall
frame. Right-shift the returned value by 3 to drop the microframe bits.

Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
This commit is contained in:
Jonathan Bell
2025-06-11 13:51:00 +01:00
committed by Dom Cobley
parent 8f6355e73c
commit c60aeaf2e6
1 changed files with 6 additions and 1 deletions
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5
drivers/usb/dwc2/hcd.c
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@@ -3775,11 +3775,16 @@ static int dwc2_hcd_is_status_changed(struct dwc2_hsotg *hsotg, int port)
int dwc2_hcd_get_frame_number(struct dwc2_hsotg *hsotg)
{
u32 hfnum = dwc2_readl(hsotg, HFNUM);
u32 hprt0 = dwc2_readl(hsotg, HPRT0);
#ifdef DWC2_DEBUG_SOF
dev_vdbg(hsotg->dev, "DWC OTG HCD GET FRAME NUMBER %d\n",
(hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT);
#endif
/* HS root port counts microframes, not frames */
if ((hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT == HPRT0_SPD_HIGH_SPEED)
return (hfnum & HFNUM_FRNUM_MASK) >> (3 + HFNUM_FRNUM_SHIFT);
else
return (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT;
}