On 27 September 2017 at 07:34, Vijay Viswanath <vviswana@xxxxxxxxxxxxxx> wrote: > Register writes which change voltage of IO lines or turn the IO bus on/off > require sdhc controller to be ready before progressing further. Once a > register write which affects IO lines is done, the driver should wait for > power irq from controller. Once the irq comes, the driver should acknowledge > the irq by writing to power control register. If the acknowledgement is not > given to controller, the controller may not complete the corresponding > register write action and this can mess up the controller if drivers proceeds > without power irq completing. > > Changes since v1: > Patch enabling MMC_IO_ACCESSORS in Kconfig moved up the patch list. > Also corrected a mistake in the patch. > Removed all ifdef CONFIG_MMC_IO_ACCESSORS since the patches using it > will come after MMC_IO_ACCESSORS are enabled. > Merged the patches 3 & 4 of earlier series into 1 patch (patch 4 in > current series). > Corrected a mistake in a comment text in patch 3 of previous series. > > Changes since RFC: > wait_for_completion_timeout replaced with wait_event_timeout when > waiting for power irq. > Removed the spinlock within power irq handler and API which waits > for power irq. > Added comments to sdhci msm register write functions, warning that they > can sleep. > Sdhci msm register write functions will do a memory barrier before > writing to the register if the particular register can trigger > power irq. > Instead of enabling SDHCI IO ACCESSORS config in arm64/defconfig, it > will be selected in mmc/host/Kconfig if the platform is MMC_SDHCI_MSM. > > Sahitya Tummala (1): > mmc: sdhci-msm: Fix HW issue with power IRQ handling during reset > > Subhash Jadavani (1): > mmc: sdhci-msm: fix issue with power irq > > Vijay Viswanath (2): > mmc: Kconfig: Enable CONFIG_MMC_SDHCI_IO_ACCESSORS > mmc: sdhci-msm: Add sdhci msm register write APIs which wait for pwr > irq > > drivers/mmc/host/Kconfig | 1 + > drivers/mmc/host/sdhci-msm.c | 235 ++++++++++++++++++++++++++++++++++++++++++- > 2 files changed, 231 insertions(+), 5 deletions(-) > Thanks, applied for next! Kind regards Uffe -- 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
