Fixing Broadcom Corporation BCM57765/57785 SDXC/MMC Card Reader

bcm57765or57785fix

Follow the WORKAROUND:
  1. Add a comand to /etc/rc.local, add the following line above "exit 0": 
        setpci -s 00:1c.2 0x50.B=0x41
  2. Add the same comand to /etc/apm/resume.d/21aspm (which does not exist yet):
        setpci -s 00:1c.2 0x50.B=0x41
  3. Add the following to /etc/modprobe.d/sdhci.conf:
          options sdhci debug_quirks2=4
  4. Re-generate initrd:
         sudo update-initramfs -u -k all
  5. Reboot or reload sdhci module:
         sudo rmmod sdhci-pci sdhci
         sudo modprobe sdhci
         sudo modprobe sdhci-pci

If SD card still not detected after reboot, type this in command line:
     $ sudo setpci -s 00:1c.2 0x50.B=0x41
Tested on Acer V5-171

Reference: 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1307674
https://wiki.allensmith.net/kb:linux:14lts-bcm57765-bmc57785

感谢，我使用　options sdhci debug_quirks=0x40 debug_quirks2=0x4　解决了问题，就是写的速度比慢点,好歹能用。
我的环境：
`
Distributor ID: Ubuntu
Description: Ubuntu 20.04.4 LTS
Release: 20.04
Codename: focal

macbookpro 13 retina late 2012　+ Ubuntu20.0.4
`

lsm@lsm-MacBookPro:~$ lspci|grep SD
02:00.1 SD Host controller: Broadcom Inc. and subsidiaries BCM57765/57785 SDXC/MMC Card Reader (rev 21)
获取到SD卡槽的编号为02:00.1　，从上面的命令查询的结果的开头编号部分，如下的命令里会使用到这个编号02:00.1。
`Follow the WORKAROUND:

1. Add a comand to /etc/rc.local, add the following line above "exit 0": （这步我省略了）
   setpci -s 02:00.1 0x50.B=0x41
2. Add the same comand to /etc/apm/resume.d/21aspm (which does not exist yet):
   setpci -s 02:00.1 0x50.B=0x41
3. Add the following to /etc/modprobe.d/sdhci.conf:
   options sdhci debug_quirks=0x40 debug_quirks2=0x4
4. Re-generate initrd:
   sudo update-initramfs -u -k all
5. Reboot or reload sdhci module:
   sudo rmmod sdhci-pci sdhci
   sudo modprobe sdhci
   sudo modprobe sdhci-pci

`

Obrigado! Resolveu no meu Mac Book Pro 2011/2012 late

for setpci to work, secure boot must be disabled at bios level.

Guy you have a paid beer if you come to Milan Italy. It worked also on a Acer AO756 , you are great!!!

thanks! Got a 2011 Macbook pro (8,1) working because of this.