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[68.4.215.93]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-302947e917dsm15047859eec.12.2026.05.18.20.27.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 May 2026 20:27:20 -0700 (PDT) Message-ID: <915473f9-64bc-4630-9c82-41fcf4401042@broadcom.com> Date: Mon, 18 May 2026 20:27:18 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Florian Fainelli Subject: Re: [PATCH] mmc: core: Kioxia 016G01 does not enter boot mode after SLEEP To: Ulf Hansson Cc: linux-kernel@vger.kernel.org, Ulf Hansson , Wolfram Sang , Oleksij Rempel , Avri Altman , Pedro Demarchi Gomes , Erick Shepherd , Adrian Hunter , "open list:MULTIMEDIA CARD (MMC), SECURE DIGITAL (SD) AND..." References: <20260413180551.3683969-1-florian.fainelli@broadcom.com> <1d583be4-b1cd-4226-bdbe-5ebd275de9c2@broadcom.com> Content-Language: en-US Autocrypt: addr=florian.fainelli@broadcom.com; keydata= xsBNBFPAG8ABCAC3EO02urEwipgbUNJ1r6oI2Vr/+uE389lSEShN2PmL3MVnzhViSAtrYxeT M0Txqn1tOWoIc4QUl6Ggqf5KP6FoRkCrgMMTnUAINsINYXK+3OLe7HjP10h2jDRX4Ajs4Ghs JrZOBru6rH0YrgAhr6O5gG7NE1jhly+EsOa2MpwOiXO4DE/YKZGuVe6Bh87WqmILs9KvnNrQ PcycQnYKTVpqE95d4M824M5cuRB6D1GrYovCsjA9uxo22kPdOoQRAu5gBBn3AdtALFyQj9DQ KQuc39/i/Kt6XLZ/RsBc6qLs+p+JnEuPJngTSfWvzGjpx0nkwCMi4yBb+xk7Hki4kEslABEB AAHNMEZsb3JpYW4gRmFpbmVsbGkgPGZsb3JpYW4uZmFpbmVsbGlAYnJvYWRjb20uY29tPsLB IQQQAQgAywUCZWl41AUJI+Jo+hcKAAG/SMv+fS3xUQWa0NryPuoRGjsA3SAUAAAAAAAWAAFr ZXktdXNhZ2UtbWFza0BwZ3AuY29tjDAUgAAAAAAgAAdwcmVmZXJyZWQtZW1haWwtZW5jb2Rp bmdAcGdwLmNvbXBncG1pbWUICwkIBwMCAQoFF4AAAAAZGGxkYXA6Ly9rZXlzLmJyb2FkY29t Lm5ldAUbAwAAAAMWAgEFHgEAAAAEFQgJChYhBNXZKpfnkVze1+R8aIExtcQpvGagAAoJEIEx tcQpvGagWPEH/2l0DNr9QkTwJUxOoP9wgHfmVhqc0ZlDsBFv91I3BbhGKI5UATbipKNqG13Z TsBrJHcrnCqnTRS+8n9/myOF0ng2A4YT0EJnayzHugXm+hrkO5O9UEPJ8a+0553VqyoFhHqA zjxj8fUu1px5cbb4R9G4UAySqyeLLeqnYLCKb4+GklGSBGsLMYvLmIDNYlkhMdnnzsSUAS61 WJYW6jjnzMwuKJ0ZHv7xZvSHyhIsFRiYiEs44kiYjbUUMcXor/uLEuTIazGrE3MahuGdjpT2 IOjoMiTsbMc0yfhHp6G/2E769oDXMVxCCbMVpA+LUtVIQEA+8Zr6mX0Yk4nDS7OiBlvOwE0E U8AbwQEIAKxr71oqe+0+MYCc7WafWEcpQHFUwvYLcdBoOnmJPxDwDRpvU5LhqSPvk/yJdh9k 4xUDQu3rm1qIW2I9Puk5n/Jz/lZsqGw8T13DKyu8eMcvaA/irm9lX9El27DPHy/0qsxmxVmU pu9y9S+BmaMb2CM9IuyxMWEl9ruWFS2jAWh/R8CrdnL6+zLk60R7XGzmSJqF09vYNlJ6Bdbs MWDXkYWWP5Ub1ZJGNJQ4qT7g8IN0qXxzLQsmz6tbgLMEHYBGx80bBF8AkdThd6SLhreCN7Uh IR/5NXGqotAZao2xlDpJLuOMQtoH9WVNuuxQQZHVd8if+yp6yRJ5DAmIUt5CCPcAEQEAAcLB gQQYAQIBKwUCU8AbwgUbDAAAAMBdIAQZAQgABgUCU8AbwQAKCRCTYAaomC8PVQ0VCACWk3n+ obFABEp5Rg6Qvspi9kWXcwCcfZV41OIYWhXMoc57ssjCand5noZi8bKg0bxw4qsg+9cNgZ3P N/DFWcNKcAT3Z2/4fTnJqdJS//YcEhlr8uGs+ZWFcqAPbteFCM4dGDRruo69IrHfyyQGx16s CcFlrN8vD066RKevFepb/ml7eYEdN5SRALyEdQMKeCSf3mectdoECEqdF/MWpfWIYQ1hEfdm C2Kztm+h3Nkt9ZQLqc3wsPJZmbD9T0c9Rphfypgw/SfTf2/CHoYVkKqwUIzI59itl5Lze+R5 wDByhWHx2Ud2R7SudmT9XK1e0x7W7a5z11Q6vrzuED5nQvkhAAoJEIExtcQpvGagugcIAJd5 EYe6KM6Y6RvI6TvHp+QgbU5dxvjqSiSvam0Ms3QrLidCtantcGT2Wz/2PlbZqkoJxMQc40rb fXa4xQSvJYj0GWpadrDJUvUu3LEsunDCxdWrmbmwGRKqZraV2oG7YEddmDqOe0Xm/NxeSobc MIlnaE6V0U8f5zNHB7Y46yJjjYT/Ds1TJo3pvwevDWPvv6rdBeV07D9s43frUS6xYd1uFxHC 7dZYWJjZmyUf5evr1W1gCgwLXG0PEi9n3qmz1lelQ8lSocmvxBKtMbX/OKhAfuP/iIwnTsww 95A2SaPiQZA51NywV8OFgsN0ITl2PlZ4Tp9hHERDe6nQCsNI/Us= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e On 5/12/26 06:33, Ulf Hansson wrote: > On Mon, 11 May 2026 at 18:01, Florian Fainelli > wrote: >> >> On 5/11/26 07:18, Ulf Hansson wrote: >>> On Mon, 13 Apr 2026 at 20:06, Florian Fainelli >>> wrote: >>>> >>>> The Kioxia 016G01 eMMC device does not exit SLEEP mode when sending CMD0 >>>> which prevents the system from properly resuming from S3 warm boot where >>>> the eMMC is necessary to pull in the boot components. >>> >>> Is the bug confirmed by Kioxia? >> >> We've been going back and forth with them without much progress as far >> as a resolution goes. Since there was no progress and I would like to >> get this included in downstream kernels at some point, this was submitted. >> >>> >>> If not, can you explain a bit more what is actually happening during >>> system resume? >> >> Upon entering Suspend-to-DRAM, the eMMC will be put into sleep mode. >> When our systems resume, one of our hardware cores driving the eMMC (HIF >> block) in command mode will send a CMD0 command for the eMMC device to > > Is the CMD0 sent solely by HW/FW before the mmc core executes > _mmc_resume() during system resume? That is correct. The sequence basically goes like this: HW sends CMD0, then FW pulls in boot code, identifies this is a Suspend to DRAM, does its steps, and eventually Linux resumes and calls _mmc_resume(). > >> exit SLEEP mode. The Kioxia 016G01 device takes 10ms rather than the >> tSLEEP_EXIT value of 1ms which is advertised and so our HIF block does > > Can you please clarify what tSLEEP_EXIT refers to? Are you referring > to the S_A_TIMEOUT in the EXT_CSD register for the eMMC card? Yes, sorry I am referring to S_A_TIMEOUT in the EXT_CSD register. > > Anyway, waking up an eMMC from sleep state in just 1ms sounds a bit > optimistic to me. Fair enough, but AFAIR we wait up to 30ms before declaring a timeout, every other vendor we have seen exits and acknowledges boot within 1-10ms at most. Similarly if the device is not in SLEEP, then it acknowledges boot within 1ms. > >> not see the Boot ACK pattern in time and does not service the read >> request from the processor that wanted to read from eMMC, we get a reset >> of the system, rather than continue booting. >> >> When SLEEP is not enabled, the eMMC device responds within tSLEEP_EXIT >> as advertised and we don't have that problem. > > Okay, I see. > > In this regard, it's important to understand for me how the mmc host > driver (and the HW/FW) manages VCC and VCCQ when the mmc core calls > mmc_power_off() from _mmc_suspend()? > > Does this turn off any of these regulators or what happens to them > during system suspend? We don't have software controlled regulators for VCC and VCCQ and our reference boards using that specific eMMC device keep it powered on through suspend-to-DRAM. This is the very reason why if it stays in sleep mode, powered on, and then we attempt to boot from eMMC we have this issue. > >> >> So I suppose I could reformulate the commit message and give some more >> details here if you would like? > > Yes, but let's discuss a bit more first. > > Kind regards > Uffe -- Florian