Marvell 8887 WiFi + Bluetooth chip fails with 200MHz SDIO clock which is used in SDR104 mode, though the Marvell chip announces to support SDR104 mode. Marvell does not recommend to use SDIO at the speed of higher than 150MHz. The Marvell 8887 chip uses a MaskRom(IC) which prevents the firmware from being updated to disable the support of SDR104 and DDR50. Thus, the current patch solution reduces the SDIO clock to 150MHz. Tested on a highly modified v3.14 kernel. The baseline for this patch is: https://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git/commit/?h=next&id=fc167daff581c01ebce8695e9618231cae3561a1 "Merge branch 'fixes' into next" on the "next" branch Changes in v4: - Change the patch to RFC - Make it possible to pick the clock rate depending on the "card id" as to avoid having one quirk per frequency. Changes in v3: - Split the commit into two seperating generic quirk and Marvell specific code. - Addressed review comments from Vladimir. Changes in v2: - Set max-frequency to 150M with SDR104 mode Diwakar Sharma (1): mmc: core: sdio: Set SDIO clock of SDR104 to 150MHz for Marvell 8887 chip Harish Jenny K N (1): mmc: core: Add a new quirk for limiting clock rate drivers/mmc/core/card.h | 6 ++++++ drivers/mmc/core/quirks.h | 3 +++ drivers/mmc/core/sdio.c | 6 +++++- include/linux/mmc/card.h | 1 + include/linux/mmc/sdio_ids.h | 1 + 5 files changed, 16 insertions(+), 1 deletion(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
