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Wed, 16 Apr 2025 19:12:07 +0000 Message-ID: Date: Wed, 16 Apr 2025 22:11:57 +0300 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] Fix V1P8_SIGNAL_ENA and HIGH_SPEED_ENA To: Judith Mendez , Ulf Hansson CC: , , Josua Mayer , Moteen Shah , Hiago De Franco References: <20250407222702.2199047-1-jm@ti.com> <3f31eded-4a7b-43f0-819f-a3be48cffc7b@ti.com> Content-Language: en-US From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki In-Reply-To: <3f31eded-4a7b-43f0-819f-a3be48cffc7b@ti.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: VI1PR0202CA0009.eurprd02.prod.outlook.com (2603:10a6:803:14::22) To BYAPR11MB3605.namprd11.prod.outlook.com (2603:10b6:a03:f5::33) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR11MB3605:EE_|MW3PR11MB4747:EE_ X-MS-Office365-Filtering-Correlation-Id: a8f6a5cc-a55f-4979-b16b-08dd7d1a948f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016; 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The >> switch to full cycle timing happens when any of HIGH_SPEED_ENA, >> V1P8_SIGNAL_ENA, or UHS_MODE_SELECT is set. >> >> Currently HIGH_SPEED_ENA is set for HS modes and violates timing >> requirements for TI devices so add a .set_hs_ena callback in >> sdhci_am654 driver so that HIGH_SPEED_ENA is not set for this mode. >> >> There are eMMC boot failures seen with V1P8_SIGNAL_ENA with a >> specific Kingston eMMC due to the sequencing when enumerating to >> HS200 mode. Since V1P8_SIGNAL_ENA is optional for eMMC, do not >> set V1P8_SIGNAL_ENA be default. This fix was previously merged in >> the kernel, but was reverted due to the "heuristics for enabling >> the quirk"[0]. The new implementation applies the quirk based-off of >> bus width, which should not be an issue since there is no internal >> LDO for MMC0 8bit wide interface and hence V1P8_SIGNAL_ENA should only >> effect timing for MMC0 interface. > > > On this patch series, I am bringing back the fix for V1P8_SIGNAL_ENA, > Ulf requested a change [0] which I am planning to do for v2. But I was > hoping to get your opinion on whether Hiago's suggestion [1] is doable > so I can add that as well to v2. Thanks for your attention. > > > [0] https://lore.kernel.org/linux-mmc/CAPDyKFqx-G4NynanFWrspz7-uXXF74RfjcU-Sw2nq2JhL3LPuQ@mail.gmail.com/ > [1] https://lore.kernel.org/linux-mmc/20250412132012.xpjywokcpztb4jg4@hiago-nb/ > Sorry for the slow reply - been a bit distracted. I'll look at it properly tomorrow, but noticed sdhci_am654_write_b() already is dealing with SDHCI_HOST_CONTROL and SDHCI_CTRL_HISPD. Can you make use of that instead of a .set_hs_ena callback?