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Mon, 6 Oct 2025 07:35:38 +0000 Message-ID: Date: Mon, 6 Oct 2025 10:35:35 +0300 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] mmc: sdhci: add quirk to disable bounce buffer To: Michael Garofalo , CC: , References: <20251006013700.2272166-1-officialTechflashYT@gmail.com> Content-Language: en-US From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo, Business Identity Code: 0357606 - 4, Domiciled in Helsinki In-Reply-To: <20251006013700.2272166-1-officialTechflashYT@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DB7PR05CA0056.eurprd05.prod.outlook.com (2603:10a6:10:2e::33) To IA1PR11MB7198.namprd11.prod.outlook.com (2603:10b6:208:419::15) 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: IA1PR11MB7198:EE_|DS0PR11MB9456:EE_ X-MS-Office365-Filtering-Correlation-Id: 7ab7478e-df51-4641-5531-08de04aaf215 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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On some hardware, this is required for proper operation. An > example of such hardware is the SDHCI controller of the Nintendo Wii's > "Hollywood" chipset. Without this patch, the onboard Broadcom 4318 > Wi-Fi fails to connect to any networks. The bounce buffer should not make any difference, so it is likely a different problem that gets hidden when the bounce buffer is not used. Could you enable dynamic debug messages and show the messages for the failing case? Dynamic debug for mmc --------------------- Kernel must be configured: CONFIG_DYNAMIC_DEBUG=y To enable mmc debug via sysfs: echo 'file drivers/mmc/core/* +p' > /sys/kernel/debug/dynamic_debug/control echo 'file drivers/mmc/host/* +p' > /sys/kernel/debug/dynamic_debug/control To enable mmc debug via kernel command line: dyndbg="file drivers/mmc/core/* +p;file drivers/mmc/host/* +p" To disable mmc debug: echo 'file drivers/mmc/core/* -p' > /sys/kernel/debug/dynamic_debug/control echo 'file drivers/mmc/host/* -p' > /sys/kernel/debug/dynamic_debug/control More general information in kernel documentation in kernel tree: Documentation/admin-guide/dynamic-debug-howto.rst https://www.kernel.org/doc/html/latest/admin-guide/dynamic-debug-howto.html > > Patch 1 introduces the new quirk bit. > Patch 2 applies it to sdhci-of-hlwd. > > Michael Garofalo (2): > mmc: sdhci: add quirk to disable the bounce buffer > mmc: sdhci-of-hlwd: disable bounce buffer usage > > drivers/mmc/host/sdhci-of-hlwd.c | 1 + > drivers/mmc/host/sdhci.c | 8 +++++--- > drivers/mmc/host/sdhci.h | 4 ++++ > 3 files changed, 10 insertions(+), 3 deletions(-) >