On 10/14/2017 11:51 PM, Marek Vasut wrote: > On 10/02/2017 11:15 AM, Jean-Jacques Hiblot wrote: >> >> >> On 22/09/2017 16:42, Jaehoon Chung wrote: >>> Dear JJ, >>> >>> On 09/21/2017 11:29 PM, Jean-Jacques Hiblot wrote: >>>> This series brings support for HS200 and UHS modes to the mmc core. >>>> It has been tested with the hsmmc driver on several platforms (DRA7, >>>> AM57x, AM437x, beaglebone black, Atmel SAMA5D3 xplained). Some >>>> modifications >>>> are required in the host driver to take advantage of this (voltage >>>> switching, >>>> tuning). The changes to the host driver will be posted a another >>>> series as this >>>> one is already long enough. >>>> >>>> The series starts with a small refactoring of th sd/mmc startup. The >>>> first 5 commits >>>> are mostly moving code around with little or no functionnal change. >>>> >>>> Then the notion of "mode" is introduced. Until now, this information >>>> wasn't >>>> kept in struct mmc. Only the clock and a flag for ddr was kept. Later >>>> the mode >>>> information will be used to select the clock frequency, the ddr flag >>>> and the >>>> tuning procedure. It will be also be check against the host >>>> capabilities. >>>> >>>> Then comes the big refactoring job in: >>>> "mmc: refactor MMC startup to make it easier to support new modes" and >>>> "mmc: refactor SD startup to make it easier to support new modes" >>>> Since the number of modes is increasing, it makes sense to try them >>>> in a more >>>> organized way. those commits use a list of supported modes and >>>> iterate through >>>> them to find the best working one. It also allows to switch more >>>> easilly from >>>> one mode to another (switching from HS200 to DDR52 to access boot >>>> partitions for example) >>>> >>>> Then there are a couple of new callback added to: >>>> - send the initialization stream (74 clock cycles) >>>> - wait while the card is busy (used during UHS voltage switching). >>>> checking is >>>> done on dat0. >>>> - select the IO voltage >>>> >>>> Then Power cycle is added. Without power cycle, if a UHS card fails >>>> to enumerate in >>>> UHS mode, it can't fall back to high speed mode and card enumeration >>>> will fail. >>>> Also in case of a reset (as opposed to a power on), it ensures that >>>> the SDCard >>>> is in clean state before re-doing the initialization. >>>> >>>> And finally the last commits add the support for HS200 and UHS. >>>> >>>> With this in place and the required changes in the HSMMC host driver >>>> (including >>>> DMA), we observe significant improvements in the performances on a >>>> DRA72 evm: >>>> eMMC HS200: 124 MB/s >>>> eMMC DDR52: 78 MB/s >>>> sd SDR104: 71 MB/s >>>> sd SDR50: 44 MB/s >>> I have one question. >>> >>> Did you test about accessing Boot partition of eMMC? >> >>> As i know, boot partition doesn't support the HS200 mode. >>> >>> When i checked your patches, there is no the function of mode changing >>> for accessing boot partition. >>> If i missed it, let me know, plz. >> Yes I did test the boot partitions. HS200 is not used in this case. >> The key function is mmc_boot_part_access_chk(). It checks if the current >> mode is supported by the partition. If not, it'll reselect a new mode. > > Is anything new happening on the HS200 front ?
Will apply this patchset. Thanks! Best Regards, Jaehoon Chung > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
