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Date:	Sat, 24 Aug 2013 14:13:38 +0800
From:	Daniel J Blueman <>
To:	"" <>,
	Linux Kernel <>,
	Chris Ball <>
Subject: BCM57765: timeout waiting for hardware interrupt

Chris et al,

with 3.11-rc6 and the Broadcom BCM57765 card reader [1] in my Macbook
Retina, interrupts are not seen during card insertion:

sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
sdhci-pci 0000:03:00.1: SDHCI controller found [14e4:16bc] (rev 10)
mmc0: no vqmmc regulator found
mmc0: no vmmc regulator found
mmc0: SDHCI controller on PCI [0000:03:00.1] using ADMA
mmc0: Timeout waiting for hardware interrupt.

However /proc/interrupts shows 4 interrupts occurring at insertion time:

 17:          6          0          0          0          0          0
         0          0   IO-APIC-fasteoi   mmc0

Debugging shows the interrupt handler inspecting the state of the
hardware and finding no work to do; are the missing regulators

--- [1]

$ sudo lspci -s 03:00.1 -v
03:00.1 SD Host controller: Broadcom Corporation NetXtreme BCM57765
Memory Card Reader (rev 10) (prog-if 01)
    Subsystem: Broadcom Corporation Device 96bc
    Flags: bus master, fast devsel, latency 0, IRQ 17
    Memory at c1820000 (64-bit, prefetchable) [size=64K]
    Capabilities: [48] Power Management version 3
    Capabilities: [58] MSI: Enable- Count=1/1 Maskable- 64bit+
    Capabilities: [ac] Express Endpoint, MSI 00
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [150] Power Budgeting <?>
    Capabilities: [160] Virtual Channel
    Kernel driver in use: sdhci-pci
Daniel J Blueman
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