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Mon, 3 Aug 2026 14:59:41 -0500 Received: from [10.249.34.24] ([10.249.34.24]) by lelvem-mr06.itg.ti.com (8.18.1/8.18.1) with ESMTP id 673Jxfxc2367144; Mon, 3 Aug 2026 14:59:41 -0500 Message-ID: <4721675e-e3ae-4e81-89db-eb0f7f419d1e@ti.com> Date: Mon, 3 Aug 2026 14:59:41 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/4] mmc: sdhci_am654: Fallback to DT-provided itap delay on DDR50 tuning failure To: "Diogo Ivo (Schneider Electric)" , Adrian Hunter , Ulf Hansson , Faiz Abbas CC: , , "Pascal EBERHARD" , Thomas Petazzoni , Miquel Raynal , References: <20260803-am654-sdhci-v2-0-a5ee5be86133@bootlin.com> <20260803-am654-sdhci-v2-4-a5ee5be86133@bootlin.com> Content-Language: en-US From: "Mendez, Judith" In-Reply-To: <20260803-am654-sdhci-v2-4-a5ee5be86133@bootlin.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF000015C7:EE_|CH3PR10MB6809:EE_ X-MS-Office365-Filtering-Correlation-Id: 69b49bb7-b10b-4abe-22a8-08def199c203 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|23010399003|376014|1800799024|82310400026|6133799003|56012099006|4143699003|10067099003|18002099003|22082099003; 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On 8/3/2026 8:47 AM, Diogo Ivo (Schneider Electric) wrote: > DDR50 mode is not required to support the tuning command CMD19, meaning > that calibration may fail on cards that do not implement it, in which > case a known-good itap delay value should be programmed into the host > controller. > > Do this by reading the (already defined) itap delay DT property for DDR50 > and, if tuning fails for this mode, fall back to the DT-provided itap delay > value. 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") Should this commit be the one to blame or should it be the commit that introduces DDR50 support? > Cc: > Signed-off-by: Diogo Ivo (Schneider Electric) > --- > 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 | 25 ++++++++++++++++++++----- > 1 file changed, 20 insertions(+), 5 deletions(-) > > diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c > index 8ce10422bba0..27ef79420eba 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 +581,18 @@ 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) { Should dev_dbg be added here to let the user know that tuning failed but DT defaults were set? ~ Judith > + 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 +768,11 @@ 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; > } > >