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path: root/drivers/mmc/host/mtk-sd.c
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Diffstat (limited to 'drivers/mmc/host/mtk-sd.c')
-rw-r--r--drivers/mmc/host/mtk-sd.c70
1 files changed, 56 insertions, 14 deletions
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 5642f71f8bf0..84e9afcb5c09 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -287,6 +287,11 @@ struct msdc_save_para {
u32 emmc50_cfg0;
};
+struct msdc_tune_para {
+ u32 iocon;
+ u32 pad_tune;
+};
+
struct msdc_delay_phase {
u8 maxlen;
u8 start;
@@ -326,7 +331,10 @@ struct msdc_host {
unsigned char timing;
bool vqmmc_enabled;
u32 hs400_ds_delay;
+ bool hs400_mode; /* current eMMC will run at hs400 mode */
struct msdc_save_para save_para; /* used when gate HCLK */
+ struct msdc_tune_para def_tune_para; /* default tune setting */
+ struct msdc_tune_para saved_tune_para; /* tune result of CMD21/CMD19 */
};
static void sdr_set_bits(void __iomem *reg, u32 bs)
@@ -582,6 +590,18 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
msdc_set_timeout(host, host->timeout_ns, host->timeout_clks);
sdr_set_bits(host->base + MSDC_INTEN, flags);
+ /*
+ * mmc_select_hs400() will drop to 50Mhz and High speed mode,
+ * tune result of hs200/200Mhz is not suitable for 50Mhz
+ */
+ if (host->sclk <= 52000000) {
+ writel(host->def_tune_para.iocon, host->base + MSDC_IOCON);
+ writel(host->def_tune_para.pad_tune, host->base + MSDC_PAD_TUNE);
+ } else {
+ writel(host->saved_tune_para.iocon, host->base + MSDC_IOCON);
+ writel(host->saved_tune_para.pad_tune, host->base + MSDC_PAD_TUNE);
+ }
+
dev_dbg(host->dev, "sclk: %d, timing: %d\n", host->sclk, timing);
}
@@ -781,7 +801,13 @@ static bool msdc_cmd_done(struct msdc_host *host, int events,
}
if (!sbc_error && !(events & MSDC_INT_CMDRDY)) {
- msdc_reset_hw(host);
+ if (cmd->opcode != MMC_SEND_TUNING_BLOCK &&
+ cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
+ /*
+ * should not clear fifo/interrupt as the tune data
+ * may have alreay come.
+ */
+ msdc_reset_hw(host);
if (events & MSDC_INT_RSPCRCERR) {
cmd->error = -EILSEQ;
host->error |= REQ_CMD_EIO;
@@ -865,7 +891,11 @@ static void msdc_start_command(struct msdc_host *host,
static void msdc_cmd_next(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_command *cmd)
{
- if (cmd->error || (mrq->sbc && mrq->sbc->error))
+ if ((cmd->error &&
+ !(cmd->error == -EILSEQ &&
+ (cmd->opcode == MMC_SEND_TUNING_BLOCK ||
+ cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200))) ||
+ (mrq->sbc && mrq->sbc->error))
msdc_request_done(host, mrq);
else if (cmd == mrq->sbc)
msdc_start_command(host, mrq, mrq->cmd);
@@ -1158,6 +1188,8 @@ static void msdc_init_hw(struct msdc_host *host)
/* Configure to default data timeout */
sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, 3);
+ host->def_tune_para.iocon = readl(host->base + MSDC_IOCON);
+ host->def_tune_para.pad_tune = readl(host->base + MSDC_PAD_TUNE);
dev_dbg(host->dev, "init hardware done!");
}
@@ -1296,7 +1328,7 @@ static int msdc_tune_response(struct mmc_host *mmc, u32 opcode)
{
struct msdc_host *host = mmc_priv(mmc);
u32 rise_delay = 0, fall_delay = 0;
- struct msdc_delay_phase final_rise_delay, final_fall_delay;
+ struct msdc_delay_phase final_rise_delay, final_fall_delay = { 0,};
u8 final_delay, final_maxlen;
int cmd_err;
int i;
@@ -1309,6 +1341,11 @@ static int msdc_tune_response(struct mmc_host *mmc, u32 opcode)
if (!cmd_err)
rise_delay |= (1 << i);
}
+ final_rise_delay = get_best_delay(host, rise_delay);
+ /* if rising edge has enough margin, then do not scan falling edge */
+ if (final_rise_delay.maxlen >= 10 ||
+ (final_rise_delay.start == 0 && final_rise_delay.maxlen >= 4))
+ goto skip_fall;
sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
for (i = 0; i < PAD_DELAY_MAX; i++) {
@@ -1318,10 +1355,9 @@ static int msdc_tune_response(struct mmc_host *mmc, u32 opcode)
if (!cmd_err)
fall_delay |= (1 << i);
}
-
- final_rise_delay = get_best_delay(host, rise_delay);
final_fall_delay = get_best_delay(host, fall_delay);
+skip_fall:
final_maxlen = max(final_rise_delay.maxlen, final_fall_delay.maxlen);
if (final_maxlen == final_rise_delay.maxlen) {
sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
@@ -1342,7 +1378,7 @@ static int msdc_tune_data(struct mmc_host *mmc, u32 opcode)
{
struct msdc_host *host = mmc_priv(mmc);
u32 rise_delay = 0, fall_delay = 0;
- struct msdc_delay_phase final_rise_delay, final_fall_delay;
+ struct msdc_delay_phase final_rise_delay, final_fall_delay = { 0,};
u8 final_delay, final_maxlen;
int i, ret;
@@ -1355,6 +1391,11 @@ static int msdc_tune_data(struct mmc_host *mmc, u32 opcode)
if (!ret)
rise_delay |= (1 << i);
}
+ final_rise_delay = get_best_delay(host, rise_delay);
+ /* if rising edge has enough margin, then do not scan falling edge */
+ if (final_rise_delay.maxlen >= 10 ||
+ (final_rise_delay.start == 0 && final_rise_delay.maxlen >= 4))
+ goto skip_fall;
sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_DSPL);
sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_W_DSPL);
@@ -1365,14 +1406,10 @@ static int msdc_tune_data(struct mmc_host *mmc, u32 opcode)
if (!ret)
fall_delay |= (1 << i);
}
-
- final_rise_delay = get_best_delay(host, rise_delay);
final_fall_delay = get_best_delay(host, fall_delay);
+skip_fall:
final_maxlen = max(final_rise_delay.maxlen, final_fall_delay.maxlen);
- /* Rising edge is more stable, prefer to use it */
- if (final_rise_delay.maxlen >= 10)
- final_maxlen = final_rise_delay.maxlen;
if (final_maxlen == final_rise_delay.maxlen) {
sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_DSPL);
sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_W_DSPL);
@@ -1402,16 +1439,21 @@ static int msdc_execute_tuning(struct mmc_host *mmc, u32 opcode)
dev_err(host->dev, "Tune response fail!\n");
return ret;
}
- ret = msdc_tune_data(mmc, opcode);
- if (ret == -EIO)
- dev_err(host->dev, "Tune data fail!\n");
+ if (host->hs400_mode == false) {
+ ret = msdc_tune_data(mmc, opcode);
+ if (ret == -EIO)
+ dev_err(host->dev, "Tune data fail!\n");
+ }
+ host->saved_tune_para.iocon = readl(host->base + MSDC_IOCON);
+ host->saved_tune_para.pad_tune = readl(host->base + MSDC_PAD_TUNE);
return ret;
}
static int msdc_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct msdc_host *host = mmc_priv(mmc);
+ host->hs400_mode = true;
writel(host->hs400_ds_delay, host->base + PAD_DS_TUNE);
return 0;
generated by cgit v1.2.3 (git 2.0.4) at 2024-12-30 19:10:22 +0000