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If the DT does not provide a value for DDR50 fallback then this > simply disables using itapdly. > > Fixes: 901d16e46296 ("mmc: sdhci_am654: Add retry tuning") > Cc: > Signed-off-by: Diogo Ivo (Schneider Electric) > Acked-by: Adrian Hunter Reviewed-by: Judith Mendez > --- > Changes in v3: > - Collect A-b from Adrian > - Add debug print when applying DT fallback values > > Changes in v2: > - As suggested by Sashiko save values read from DT for DDR50 in separate > variables in order to keep them across multiple tuning cycles without > overwriting them. > --- > drivers/mmc/host/sdhci_am654.c | 26 +++++++++++++++++++++----- > 1 file changed, 21 insertions(+), 5 deletions(-) > > diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c > index 8ce10422bba0..8edfab5012ed 100644 > --- a/drivers/mmc/host/sdhci_am654.c > +++ b/drivers/mmc/host/sdhci_am654.c > @@ -126,7 +126,7 @@ static const struct timing_data td[] = { > NULL, > MMC_CAP_UHS_SDR104}, > [MMC_TIMING_UHS_DDR50] = {"ti,otap-del-sel-ddr50", > - NULL, > + "ti,itap-del-sel-ddr50", > MMC_CAP_UHS_DDR50}, > [MMC_TIMING_MMC_DDR52] = {"ti,otap-del-sel-ddr52", > "ti,itap-del-sel-ddr52", > @@ -144,6 +144,8 @@ struct sdhci_am654_data { > u32 otap_del_sel[ARRAY_SIZE(td)]; > u32 itap_del_sel[ARRAY_SIZE(td)]; > u32 itap_del_ena[ARRAY_SIZE(td)]; > + u32 itap_del_sel_dt_ddr50; > + u32 itap_del_ena_dt_ddr50; > int clkbuf_sel; > int trm_icp; > int drv_strength; > @@ -579,10 +581,19 @@ static int sdhci_am654_platform_execute_tuning(struct sdhci_host *host, > } while (++tuning_loop < RETRY_TUNING_MAX); > > if (itapdly < 0) { > - dev_err(dev, "Failed to find itapdly, fail tuning\n"); > - sdhci_am654_write_itapdly(sdhci_am654, 0, 0); > - sdhci_am654->itap_del_ena[timing] = 0; > - sdhci_am654->itap_del_sel[timing] = 0; > + if (timing == MMC_TIMING_UHS_DDR50) { > + dev_dbg(dev, "Failed DDR50 tuning, fallback to DT ITAP\n"); Its not a big deal, but it would be a bit better to use itapdly according to the datasheet instead of itap (: > + sdhci_am654->itap_del_sel[timing] = sdhci_am654->itap_del_sel_dt_ddr50; > + sdhci_am654->itap_del_ena[timing] = sdhci_am654->itap_del_ena_dt_ddr50; > + } else { > + dev_err(dev, "Failed to find itapdly, fail tuning\n"); > + sdhci_am654->itap_del_ena[timing] = 0; > + sdhci_am654->itap_del_sel[timing] = 0; > + } > + > + sdhci_am654_write_itapdly(sdhci_am654, > + sdhci_am654->itap_del_sel[timing], > + sdhci_am654->itap_del_ena[timing]); > return -1; > } > > @@ -758,6 +769,11 @@ static int sdhci_am654_get_otap_delay(struct sdhci_host *host, > } > } > > + sdhci_am654->itap_del_sel_dt_ddr50 = > + sdhci_am654->itap_del_sel[MMC_TIMING_UHS_DDR50]; > + sdhci_am654->itap_del_ena_dt_ddr50 = > + sdhci_am654->itap_del_ena[MMC_TIMING_UHS_DDR50]; > + > return 0; > } > >