This patch series attempts to make the 1.8V signal voltage switch required for UHS mode work according to the SD specification. These patches have been tested with a couple of UHS SD cards, one of which sometimes requires up to five power cycles before it accepts the signal voltage switch. The patches have also been tested with various other SD cards, as well as one SDIO WLAN chip (cw1200) to check for regressions. The patches have also been tested with CONFIG_MMC_CLKGATE. As usual, I'd be very grateful if someone could help me test this patch with an UHS SDIO card and perhaps also a combo card (which does seem to be rare these days?)? This patch series is based on previous RFC/patch: [RFC/PATCH v2] mmc: core: Fixup signal voltage switch and more recently on Kevin Liu's patches: [PATCH v2 1/3] mmc: core: enhance the code for signal voltage setting [PATCH v2 2/3] mmc: core: cycle power the card in voltage switch rather than mmc_sd_get_cid Changelog: v1 -> v2 - Move mmc_power_cycle to the mmc_set_signal_voltage function - Check card_busy before switching voltages - Return -EPERM if signal voltage switch with cmd11 is requested, but no start_signal_voltage_switch is defined. - If we're switching back to 3.3 V, just do the switch without checking card_busy etc v2 -> This patch series - Removed the extra argument to the card_busy host_ops function - Added mmc_power_cycle - Some clarifying comments v1 -> v2 - Removed reset of signal voltage in mmc_sd_get_cid, since "mmc: core: reset signal voltage on power up" previous two patches -> v1: - Keep calls to mmc_host_clk_hold / mmc_host_clk_release - Add retry-loop / power cycle in sdio.c - Fall back to 3.3 V if the switch repeatedly fails - Add an extra argument to the card_busy host_ops function, which can be used to signal polling use of the function Johan Rudholm (3): mmc: core: Add mmc_power_cycle mmc: core: Add card_busy to host_ops mmc: core: Fixup signal voltage switch drivers/mmc/core/core.c | 83 +++++++++++++++++++++++++++++++++++++++++++--- drivers/mmc/core/core.h | 1 + drivers/mmc/core/sd.c | 21 +++++++++--- drivers/mmc/core/sdio.c | 20 +++++++++-- include/linux/mmc/host.h | 3 ++ 5 files changed, 116 insertions(+), 12 deletions(-) -- 1.7.10 -- 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
