diff options
| author | Peng Fan <Peng.Fan@freescale.com> | 2015-03-19 16:12:52 +0800 |
|---|---|---|
| committer | Max Krummenacher <max.krummenacher@toradex.com> | 2016-03-09 14:42:15 +0100 |
| commit | 158d41e5c00a49a3644135e2522e533f2533aca1 (patch) | |
| tree | d645f4d20e5353999150691d9bd93b7a3c843654 /drivers | |
| parent | 1fabcea8f6659416708dc6000cacb72f30d9cf56 (diff) | |
MLK-10445 mmc: fix OCR Polling
If in mmc_send_op_cond, OCR_BUSY is set in CMD1's response, then
state is transfered to Ready state, and there is no need to send
CMD1 again. Otherwise following CMD1 will recieve no response, or
timeour error from driver such as fsl_esdhc.c.
If not into Ready state in previous CMD1, then continue CMD1 command.
In mmc_complete_op_cond, we use the value mmc->op_cond_response
from mmc_send_op_cond, since there should be no CMD1 command between
mmc_send_op_cond and mmc_complete_op_cond
Before fixing this, uboot log shows:
"
CMD_SEND:0
ARG 0x00000000
MMC_RSP_NONE
CMD_SEND:8
ARG 0x000001AA
MMC_RSP_R1,5,6,7 0x18EC1504
CMD_SEND:55
ARG 0x00000000
MMC_RSP_R1,5,6,7 0x18EC1504
CMD_SEND:0
ARG 0x00000000
MMC_RSP_NONE
CMD_SEND:1
ARG 0x00000000
MMC_RSP_R3,4 0x00FF8080
CMD_SEND:1
ARG 0x40300000
MMC_RSP_R3,4 0xC0FF8080 --> Already OCR_BUSY set
CMD_SEND:1
ARG 0x40300000
MMC_RSP_R3,4 0x0096850A --> Failed CMD1
MMC init failed
"
Using this patch, this issue is fixed, emmc can be detected correctly.
This issue exists on mx7dsabresd and mx7d_12x12_lpddr3_arm2 board.
Upstream Patchwork:
https://patchwork.ozlabs.org/patch/451775/
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
(cherry picked from commit ca4113da25b42bce44a2e7998966a47352f11613)
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/mmc.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index a13769ea25..43a9a8ab9f 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -406,14 +406,23 @@ static int mmc_complete_op_cond(struct mmc *mmc) mmc->op_cond_pending = 0; start = get_timer(0); - do { + /* + * If in mmc_send_op_cond, OCR_BUSY is set in CMD1's response, then + * state is transfered to Ready state, and there is no need to + * send CMD1 again. Otherwise following CMD1 will recieve no response, + * or timeour error from driver such as fsl_esdhc.c. + * + * If not into Ready state in previous CMD1, then continue CMD1 + * command. + */ + while (!(mmc->op_cond_response & OCR_BUSY)) { err = mmc_send_op_cond_iter(mmc, &cmd, 1); if (err) return err; if (get_timer(start) > timeout) return UNUSABLE_ERR; udelay(100); - } while (!(mmc->op_cond_response & OCR_BUSY)); + } if (mmc_host_is_spi(mmc)) { /* read OCR for spi */ cmd.cmdidx = MMC_CMD_SPI_READ_OCR; |