[PATCH 1/3] sdhci: register defs for sd 3.0 HOST CONTROL 2 adds the definitions needed for HOST_CONTROL_2 Register [PATCH 2/3] mmc and sdhci: sdhci set_ddr does not change signaling voltage when core/ layer indicates this is not needed. eMMC cards working at 3.3V do not need to have their i/o signaling level changed since they are obviously working and 3.3v or lower vccq is supported. eMMC Voltage (vcc) and i/o signaling (vccq) allowed vcc 3.3V 3.3v vccq - 1.8v vccq - 1.2v vccq 1.8V - 1.8v vccq - 1.2v vccq 1.2V - 1.2v vccq We have a single voltage eMMC (which is all we support since dual voltage cards are not supported). We have no idea what vccq it is operating at. eMMC cards are usually mounted on the board. For a eMMC not operating at 1.2V vccq we signal the host/ layer to leave the signaling voltage alone since we are obviously working. We have no idea if switching the card to 1.8V vccq is supported by the card. If the eMMC card indicates it supports 1.2V vccq we notify the driver since 1.2V core voltage (vcc) is not supported and a i/o signal voltage change will be needed. Note: SD Host Controller (sdhci.c) does not support 1.2V vcc. [PATCH 3/3] sdhci: add support sdhci-pxa for testing. The callback is needed since the Marvell controller requires V18_EN to be set for DDR. The controller does not change the i/o signaling voltage (vccq). -- 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
