diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2022-06-18 13:19:55 +0000 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2022-06-18 13:19:55 +0000 |
| commit | e760ded4943d802d7012514d56e18a8ddb54cc56 (patch) | |
| tree | a622599c95eb5845f00d3244484cd29a3957df3c /sys | |
| parent | 524f8c2d5374e34bbb665e7a52484859ae9e3e59 (diff) | |
imx8/usdhc: implement highspeed mode (50Mhz)
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/src/9/imx8/usdhc.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/sys/src/9/imx8/usdhc.c b/sys/src/9/imx8/usdhc.c index 01ea685d6..ba3989211 100644 --- a/sys/src/9/imx8/usdhc.c +++ b/sys/src/9/imx8/usdhc.c @@ -10,6 +10,7 @@ enum { Initfreq = 400000, /* initialisation frequency for MMC */ SDfreq = 25*Mhz, /* standard SD frequency */ + SDfreqhs = 50*Mhz, /* highspeed frequency */ DTO = 14, /* data timeout exponent (guesswork) */ GoIdle = 0, /* mmc/sdio go idle state */ @@ -446,6 +447,15 @@ usdhccmd(u32int cmd, u32int arg, u32int *resp) WR(Control0, (RR(Control0) & ~DwidthMask) | Dwidth4); break; } + } else { + /* + * If card switched into high speed mode, increase clock speed + */ + if((arg&0x8000000F) == 0x80000001){ + delay(1); + usdhcclk(SDfreqhs); + delay(1); + } } }else if(cmd == IORWdirect && (arg & ~0xFF) == (1<<31|0<<28|7<<9)){ switch(arg & 0x3){ @@ -518,4 +528,5 @@ SDio sdio = { usdhccmd, usdhciosetup, usdhcio, + .highspeed = 1, }; |