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Thu, 17 Apr 2025 12:03:20 +0000 Message-ID: <48664ea9-f949-43de-8706-463e78afcb61@intel.com> Date: Thu, 17 Apr 2025 15:03:13 +0300 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] Fix V1P8_SIGNAL_ENA and HIGH_SPEED_ENA From: Adrian Hunter 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 Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BE1P281CA0214.DEUP281.PROD.OUTLOOK.COM (2603:10a6:b10:88::11) To PH7PR11MB6054.namprd11.prod.outlook.com (2603:10b6:510:1d2::8) Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH7PR11MB6054:EE_|SA1PR11MB8476:EE_ X-MS-Office365-Filtering-Correlation-Id: f9a960e2-8a93-49a3-0c81-08dd7da7d8bc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014; 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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? Patch 1 continues to look unneeded because sdhci_am654_write_b() seems to do the same thing. WRT patch 2, the suggestion to add a DT property and check the bus width seems fine to me. DT properties can be added to identify "broken" hardware that cannot be identified by the compatible string.