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- meson-gx: work around broken SDIO with certain WiFi chips
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Merge tag 'mmc-v4.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc

Pull MMC fix from Ulf Hansson:
 "MMC meson-gx host: work around broken SDIO with certain WiFi chips"

* tag 'mmc-v4.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
  mmc: meson-gx: work around broken SDIO with certain WiFi chips
This commit is contained in:
Linus Torvalds 2017-06-16 17:49:52 +09:00
parent db96d5853e 24835611a9
commit 3bee1970b3
1 changed files with 9 additions and 0 deletions
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9
drivers/mmc/host/meson-gx-mmc.c
View file

@ -210,6 +210,15 @@ static void meson_mmc_get_transfer_mode(struct mmc_host *mmc,
int i;
bool use_desc_chain_mode = true;
/*
* Broken SDIO with AP6255-based WiFi on Khadas VIM Pro has been
* reported. For some strange reason this occurs in descriptor
* chain mode only. So let's fall back to bounce buffer mode
* for command SD_IO_RW_EXTENDED.
*/
if (mrq->cmd->opcode == SD_IO_RW_EXTENDED)
return;
for_each_sg(data->sg, sg, data->sg_len, i)
/* check for 8 byte alignment */
if (sg->offset & 7) {