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emmc: using rx delay to avoid invalid tuning

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PD#165303: emmc: using rx delay to avoid invalid tuning

When emmc work at hs200@200Mhz, tuning result using fixed
adj mode may got a full window. The tuning result contains
invalid point. we have to adjust rx-delay to avoid it.

Change-Id: I33c5e234fe0f480180b0c9312641ba7a0a4e9cfb
Signed-off-by: Yonghui Yu <yonghui.yu@amlogic.com>
This commit is contained in:
Yonghui Yu
2018-04-26 23:10:57 +08:00
committed by Jianxin Pan
parent fc307b359a
commit a1015e7b4c
1 changed files with 24 additions and 3 deletions
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27
drivers/amlogic/mmc/aml_sd_emmc_v3.c
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@@ -985,13 +985,22 @@ static int _aml_sd_emmc_execute_tuning(struct mmc_host *mmc, u32 opcode,
u8 tuning_num = 0;
u32 clk_div;
u32 adj_delay_find;
int wrap_win_start = -1, wrap_win_size = 0;
int best_win_start = -1, best_win_size = 0;
int curr_win_start = -1, curr_win_size = 0;
int wrap_win_start, wrap_win_size;
int best_win_start, best_win_size;
int curr_win_start, curr_win_size;
u32 rxdly[3] = {0xA28A28A, 0x15500514, 0x1FF8079E};
writel(0, host->base + SD_EMMC_ADJUST_V3);
tunning:
/* renew */
wrap_win_start = -1;
wrap_win_size = 0;
best_win_start = -1;
best_win_size = 0;
curr_win_start = -1;
curr_win_size = 0;
spin_lock_irqsave(&host->mrq_lock, flags);
pdata->need_retuning = false;
spin_unlock_irqrestore(&host->mrq_lock, flags);
@@ -1075,6 +1084,18 @@ tunning:
pr_info("%s: tuning failed, reduce freq and retuning\n",
mmc_hostname(host->mmc));
goto tunning;
} else if (best_win_size == clk_div) {
if (++tuning_num > MAX_TUNING_RETRY) {
pr_err("%s: tuning failed\n",
mmc_hostname(host->mmc));
return -1;
}
pr_warn("wave is not sharp, again\n");
/* add basic data rx delay */
writel(rxdly[tuning_num-1], host->base + SD_EMMC_DELAY1_V3);
writel(rxdly[tuning_num-1], host->base + SD_EMMC_DELAY2_V3);
pr_warn("rxdly @ %x\n", rxdly[tuning_num-1]);
goto tunning;
} else
pr_info("%s: best_win_start =%d, best_win_size =%d\n",
mmc_hostname(host->mmc),