Commit f0c8234c authored by Takeshi Saito's avatar Takeshi Saito Committed by Ulf Hansson

mmc: renesas_sdhi: Change HW adjustment register according to speed mode

SCC is used for SDR104/HS200/HS400. We need to change SCC_DT2FF
according to the mode. If it is inappropriate, CRC error tends to occur.

This adds variable "tap_hs400" for HS400 mode and configures SCC_DT2FF
as needed.
Signed-off-by: default avatarTakeshi Saito <takeshi.saito.xv@renesas.com>
[wsa: rebased to upstream and updated commit message]
Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: default avatarNiklas Söderlund <niklas.soderlund@ragnatech.se>
Tested-by: default avatarMarek Vasut <marek.vasut@gmail.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent e9968c6f
......@@ -15,6 +15,7 @@
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 */
};
struct renesas_sdhi_of_data {
......@@ -49,6 +50,7 @@ struct renesas_sdhi {
struct pinctrl_state *pins_default, *pins_uhs;
void __iomem *scc_ctl;
u32 scc_tappos;
u32 scc_tappos_hs400;
};
#define host_to_priv(host) \
......
......@@ -337,6 +337,10 @@ static void renesas_sdhi_hs400_complete(struct tmio_mmc_host *host)
/* Set HS400 mode */
sd_ctrl_write16(host, CTL_SDIF_MODE, 0x0001 |
sd_ctrl_read16(host, CTL_SDIF_MODE));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF,
priv->scc_tappos_hs400);
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2,
(SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN |
SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) |
......@@ -396,6 +400,9 @@ static void renesas_sdhi_reset_hs400_mode(struct tmio_mmc_host *host,
/* Reset HS400 mode */
sd_ctrl_write16(host, CTL_SDIF_MODE, ~0x0001 &
sd_ctrl_read16(host, CTL_SDIF_MODE));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, priv->scc_tappos);
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2,
~(SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN |
SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) &
......@@ -786,6 +793,7 @@ int renesas_sdhi_probe(struct platform_device *pdev,
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;
hit = true;
break;
}
......
......@@ -81,6 +81,7 @@ static struct renesas_sdhi_scc rcar_gen3_scc_taps[] = {
{
.clk_rate = 0,
.tap = 0x00000300,
.tap_hs400 = 0x00000704,
},
};
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment