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| author | Andrew Gabbasov <andrew_gabbasov@mentor.com> | 2015-03-19 07:44:06 -0500 |
|---|---|---|
| committer | Pantelis Antoniou <pantelis.antoniou@konsulko.com> | 2015-05-05 11:55:00 +0300 |
| commit | 1677eef45976da1cdccc73cd4291877dbb05eea9 (patch) | |
| tree | ed05c85e37348591dd9204425e6ca74c087c8faf /drivers/mmc | |
| parent | cc17c01f2d3b691ddadbd46727d5f22db0a90808 (diff) | |
| download | u-boot-imx-1677eef45976da1cdccc73cd4291877dbb05eea9.zip u-boot-imx-1677eef45976da1cdccc73cd4291877dbb05eea9.tar.gz u-boot-imx-1677eef45976da1cdccc73cd4291877dbb05eea9.tar.bz2 | |
mmc: Restructure polling loops to avoid extra delays
The polling loops in sd_send_op_cond and mmc_complete_op_cond functions
check the ready flag state at the end of the loop, that is after executing
a delay inside the loop, which, in case of exiting with no error,
is not needed. Also, one of these loops, as well as the loop
in mmc_send_status, have the delay just before exiting on timeout
conditions.
Restructure all these loops to check the respective conditions before making
a delay for the next loop pass, and to appropriately exit without the delay.
Signed-off-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/mmc.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 42af47c..b81533c 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -118,7 +118,7 @@ int mmc_send_status(struct mmc *mmc, int timeout) if (!mmc_host_is_spi(mmc)) cmd.cmdarg = mmc->rca << 16; - do { + while (1) { err = mmc_send_cmd(mmc, &cmd, NULL); if (!err) { if ((cmd.response[0] & MMC_STATUS_RDY_FOR_DATA) && @@ -135,9 +135,11 @@ int mmc_send_status(struct mmc *mmc, int timeout) } else if (--retries < 0) return err; - udelay(1000); + if (timeout-- <= 0) + break; - } while (timeout--); + udelay(1000); + } #ifdef CONFIG_MMC_TRACE status = (cmd.response[0] & MMC_STATUS_CURR_STATE) >> 9; @@ -291,7 +293,7 @@ static int sd_send_op_cond(struct mmc *mmc) int err; struct mmc_cmd cmd; - do { + while (1) { cmd.cmdidx = MMC_CMD_APP_CMD; cmd.resp_type = MMC_RSP_R1; cmd.cmdarg = 0; @@ -322,11 +324,14 @@ static int sd_send_op_cond(struct mmc *mmc) if (err) return err; - udelay(1000); - } while ((!(cmd.response[0] & OCR_BUSY)) && timeout--); + if (cmd.response[0] & OCR_BUSY) + break; - if (timeout <= 0) - return UNUSABLE_ERR; + if (timeout-- <= 0) + return UNUSABLE_ERR; + + udelay(1000); + } if (mmc->version != SD_VERSION_2) mmc->version = SD_VERSION_1_0; @@ -405,14 +410,16 @@ static int mmc_complete_op_cond(struct mmc *mmc) mmc->op_cond_pending = 0; if (!(mmc->ocr & OCR_BUSY)) { start = get_timer(0); - do { + while (1) { err = mmc_send_op_cond_iter(mmc, 1); if (err) return err; + if (mmc->ocr & OCR_BUSY) + break; if (get_timer(start) > timeout) return UNUSABLE_ERR; udelay(100); - } while (!(mmc->ocr & OCR_BUSY)); + } } if (mmc_host_is_spi(mmc)) { /* read OCR for spi */ |