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emmc: add tuning retry.

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PD#167389: add tuning retry when tuning points num == clk_div.

Change-Id: I9cc68c9c69c1aad55e8cc916a5d5a4f6441e3ace
Signed-off-by: Nan Li <nan.li@amlogic.com>
This commit is contained in:
Nan Li
2018-06-22 13:26:04 +08:00
committed by Jianxin Pan
parent 37111ed5fb
commit 36f8db78fa
1 changed files with 12 additions and 0 deletions
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12
drivers/amlogic/mmc/aml_sd_emmc.c
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@@ -716,6 +716,7 @@ int aml_sd_emmc_execute_tuning_(struct mmc_host *mmc, u32 opcode,
u32 clock, clk_div;
u32 adj_delay_find;
int best_win_start = -1, best_win_size = 0;
u32 rxdly[4] = {0x44444444, 0x88888888, 0xcccccccc, 0xFFFFFFFF};
writel(0, host->base + SD_EMMC_ADJUST);
@@ -746,6 +747,17 @@ tunning:
pr_err("%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_DELAY);
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), best_win_start, best_win_size);