diff options
| author | Veerabhadrarao Badiganti <vbadigan@codeaurora.org> | 2017-06-15 18:44:19 +0530 |
|---|---|---|
| committer | Veerabhadrarao Badiganti <vbadigan@codeaurora.org> | 2017-06-16 23:05:13 +0530 |
| commit | b3c43dda50ddbb0bab781c47f533b74debb9046b (patch) | |
| tree | 601b169abdeacbac64eda53a2f42389ddcfec2c4 | |
| parent | e822583117ab0cf8af8a03d5bb78d782007b557f (diff) | |
mmc: sdhci-msm: Set dll to good phase while sending cmd13 in tuning
Set the dll to last known good phase before sending status command
while executing tuning. This is to ensure that status command won't
fail due to bad phase. Thus we can avoid sending status command
multiple times and reduce tuning latency.
Change-Id: Ib7fa5a8acbbffd9662617a357d221b36494a98b9
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
| -rw-r--r-- | drivers/mmc/host/sdhci-msm.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index 1eeab7db9722..034be9b1ae64 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -1139,6 +1139,7 @@ int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode) bool drv_type_changed = false; struct mmc_card *card = host->mmc->card; int sts_retry; + u8 last_good_phase = 0; /* * Tuning is required for SDR104, HS200 and HS400 cards and @@ -1224,6 +1225,22 @@ retry: mmc_wait_for_req(mmc, &mrq); if (card && (cmd.error || data.error)) { + /* + * Set the dll to last known good phase while sending + * status command to ensure that status command won't + * fail due to bad phase. + */ + if (tuned_phase_cnt) + last_good_phase = + tuned_phases[tuned_phase_cnt-1]; + else if (msm_host->saved_tuning_phase != + INVALID_TUNING_PHASE) + last_good_phase = msm_host->saved_tuning_phase; + + rc = msm_config_cm_dll_phase(host, last_good_phase); + if (rc) + goto kfree; + sts_cmd.opcode = MMC_SEND_STATUS; sts_cmd.arg = card->rca << 16; sts_cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |