Commit 86601d0e authored by Chaotian Jing's avatar Chaotian Jing Committed by Ulf Hansson
Browse files

mmc: mediatek: tune CMD/DATA together 



for MSDC IP which supports both data tune and async fifo, it can
tune cmd/data together. which can save the time and make the tune
result of CMD more stable as data line are 4bit or 8bit.

Signed-off-by: default avatarChaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent f38a9774

drivers/mmc/host/mtk-sd.c

+87 −0
Original line number Diff line number Diff line
@@ -1773,12 +1773,98 @@ static int msdc_tune_data(struct mmc_host *mmc, u32 opcode) 
	return final_delay == 0xff ? -EIO : 0;

}



/*

 * MSDC IP which supports data tune + async fifo can do CMD/DAT tune

 * together, which can save the tuning time.

 */

static int msdc_tune_together(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 = { 0,};

	u8 final_delay, final_maxlen;

	u32 tune_reg = host->dev_comp->pad_tune_reg;

	int i, ret;



	sdr_set_field(host->base + MSDC_PATCH_BIT, MSDC_INT_DAT_LATCH_CK_SEL,

		      host->latch_ck);



	sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);

	sdr_clr_bits(host->base + MSDC_IOCON,

		     MSDC_IOCON_DSPL | MSDC_IOCON_W_DSPL);

	for (i = 0 ; i < PAD_DELAY_MAX; i++) {

		sdr_set_field(host->base + tune_reg,

			      MSDC_PAD_TUNE_CMDRDLY, i);

		sdr_set_field(host->base + tune_reg,

			      MSDC_PAD_TUNE_DATRRDLY, i);

		ret = mmc_send_tuning(mmc, opcode, NULL);

		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 >= 12 ||

	    (final_rise_delay.start == 0 && final_rise_delay.maxlen >= 4))

		goto skip_fall;



	sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);

	sdr_set_bits(host->base + MSDC_IOCON,

		     MSDC_IOCON_DSPL | MSDC_IOCON_W_DSPL);

	for (i = 0; i < PAD_DELAY_MAX; i++) {

		sdr_set_field(host->base + tune_reg,

			      MSDC_PAD_TUNE_CMDRDLY, i);

		sdr_set_field(host->base + tune_reg,

			      MSDC_PAD_TUNE_DATRRDLY, i);

		ret = mmc_send_tuning(mmc, opcode, NULL);

		if (!ret)

			fall_delay |= (1 << i);

	}

	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);

		sdr_clr_bits(host->base + MSDC_IOCON,

			     MSDC_IOCON_DSPL | MSDC_IOCON_W_DSPL);

		sdr_set_field(host->base + tune_reg, MSDC_PAD_TUNE_CMDRDLY,

			      final_rise_delay.final_phase);

		sdr_set_field(host->base + tune_reg,

			      MSDC_PAD_TUNE_DATRRDLY,

			      final_rise_delay.final_phase);

		final_delay = final_rise_delay.final_phase;

	} else {

		sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);

		sdr_set_bits(host->base + MSDC_IOCON,

			     MSDC_IOCON_DSPL | MSDC_IOCON_W_DSPL);

		sdr_set_field(host->base + tune_reg, MSDC_PAD_TUNE_CMDRDLY,

			      final_fall_delay.final_phase);

		sdr_set_field(host->base + tune_reg,

			      MSDC_PAD_TUNE_DATRRDLY,

			      final_fall_delay.final_phase);

		final_delay = final_fall_delay.final_phase;

	}



	dev_dbg(host->dev, "Final pad delay: %x\n", final_delay);

	return final_delay == 0xff ? -EIO : 0;

}



static int msdc_execute_tuning(struct mmc_host *mmc, u32 opcode)

{

	struct msdc_host *host = mmc_priv(mmc);

	int ret;

	u32 tune_reg = host->dev_comp->pad_tune_reg;



	if (host->dev_comp->data_tune && host->dev_comp->async_fifo) {

		ret = msdc_tune_together(mmc, opcode);

		if (host->hs400_mode) {

			sdr_clr_bits(host->base + MSDC_IOCON,

				     MSDC_IOCON_DSPL | MSDC_IOCON_W_DSPL);

			sdr_set_field(host->base + tune_reg,

				      MSDC_PAD_TUNE_DATRRDLY, 0);

		}

		goto tune_done;

	}

	if (host->hs400_mode &&

	    host->dev_comp->hs400_tune)

		ret = hs400_tune_response(mmc, opcode);
@@ -1794,6 +1880,7 @@ static int msdc_execute_tuning(struct mmc_host *mmc, u32 opcode) 
			dev_err(host->dev, "Tune data fail!\n");

	}



tune_done:

	host->saved_tune_para.iocon = readl(host->base + MSDC_IOCON);

	host->saved_tune_para.pad_tune = readl(host->base + tune_reg);

	host->saved_tune_para.pad_cmd_tune = readl(host->base + PAD_CMD_TUNE);