Commit c1a49782 authored by Wolfram Sang's avatar Wolfram Sang Committed by Ulf Hansson
Browse files

mmc: renesas_sdhi: use recent tap values for HS400 



New datasheets require different and new values for HS400 with 4taps or
8taps.

Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: default avatarYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: default avatarYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20191203200513.1758-6-wsa+renesas@sang-engineering.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 12e3c55d

drivers/mmc/host/renesas_sdhi.h

+2 −2
Original line number Diff line number Diff line
@@ -14,8 +14,8 @@ 


struct renesas_sdhi_scc {

	unsigned long clk_rate;	/* clock rate for SDR104 */

	u32 tap;		/* sampling clock position for SDR104 */

	u32 tap_hs400;		/* sampling clock position for HS400 */

	u32 tap;		/* sampling clock position for SDR104/HS400 (8 TAP) */

	u32 tap_hs400_4tap;	/* sampling clock position for HS400 (4 TAP) */

};



struct renesas_sdhi_of_data {

drivers/mmc/host/renesas_sdhi_core.c

+4 −1
Original line number Diff line number Diff line
@@ -793,13 +793,16 @@ int renesas_sdhi_probe(struct platform_device *pdev, 
	     host->mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR |

				 MMC_CAP2_HS400_1_8V))) {

		const struct renesas_sdhi_scc *taps = of_data->taps;

		bool use_4tap = priv->quirks && priv->quirks->hs400_4taps;

		bool hit = false;



		for (i = 0; i < of_data->taps_num; i++) {

			if (taps[i].clk_rate == 0 ||

			    taps[i].clk_rate == host->mmc->f_max) {

				priv->scc_tappos = taps->tap;

				priv->scc_tappos_hs400 = taps->tap_hs400;

				priv->scc_tappos_hs400 = use_4tap ?

							 taps->tap_hs400_4tap :

							 taps->tap;

				hit = true;

				break;

			}

drivers/mmc/host/renesas_sdhi_internal_dmac.c

+1 −1
Original line number Diff line number Diff line
@@ -82,7 +82,7 @@ static struct renesas_sdhi_scc rcar_gen3_scc_taps[] = { 
	{

		.clk_rate = 0,

		.tap = 0x00000300,

		.tap_hs400 = 0x00000704,

		.tap_hs400_4tap = 0x00000100,

	},

};

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