Re: [PATCH v1] mmc: mmc: Fix HS setting in mmc_hs400_to_hs200()

2019-02-14 Thread Chaotian Jing
On Thu, 2019-02-14 at 09:14 +0100, Ulf Hansson wrote: > On Thu, 14 Feb 2019 at 03:14, Chaotian Jing > wrote: > > > > On Wed, 2019-02-13 at 13:08 +0100, Ulf Hansson wrote: > > > On Wed, 13 Feb 2019 at 10:07, Chaotian Jing > > > wrote: > > > > > > > > mmc_hs400_to_hs200() begins with the card and

Re: [PATCH v1] mmc: mmc: Fix HS setting in mmc_hs400_to_hs200()

2019-02-14 Thread Ulf Hansson
On Thu, 14 Feb 2019 at 03:14, Chaotian Jing wrote: > > On Wed, 2019-02-13 at 13:08 +0100, Ulf Hansson wrote: > > On Wed, 13 Feb 2019 at 10:07, Chaotian Jing > > wrote: > > > > > > mmc_hs400_to_hs200() begins with the card and host in HS400 mode. > > > Therefore, any commands sent to the card sho

Re: [PATCH v1] mmc: mmc: Fix HS setting in mmc_hs400_to_hs200()

2019-02-13 Thread Chaotian Jing
On Wed, 2019-02-13 at 13:08 +0100, Ulf Hansson wrote: > On Wed, 13 Feb 2019 at 10:07, Chaotian Jing > wrote: > > > > mmc_hs400_to_hs200() begins with the card and host in HS400 mode. > > Therefore, any commands sent to the card should use HS400 timing. > > reduce clock frequency to 50Mhz but with

Re: [PATCH v1] mmc: mmc: Fix HS setting in mmc_hs400_to_hs200()

2019-02-13 Thread Ulf Hansson
On Wed, 13 Feb 2019 at 10:07, Chaotian Jing wrote: > > mmc_hs400_to_hs200() begins with the card and host in HS400 mode. > Therefore, any commands sent to the card should use HS400 timing. > reduce clock frequency to 50Mhz but without host timming change > may cause CMD6 response CRC error. becaus

[PATCH v1] mmc: mmc: Fix HS setting in mmc_hs400_to_hs200()

2019-02-13 Thread Chaotian Jing
mmc_hs400_to_hs200() begins with the card and host in HS400 mode. Therefore, any commands sent to the card should use HS400 timing. reduce clock frequency to 50Mhz but without host timming change may cause CMD6 response CRC error. because host still running at hs400 mode, and it's hard to find a su