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Wed, 11 Mar 2026 03:31:11 -0700 (PDT) Received: from 1f3ae71dd79f ([115.245.213.202]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-829f6eebf57sm2052558b3a.38.2026.03.11.03.31.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Mar 2026 03:31:10 -0700 (PDT) From: Sanjaikumar V S To: mwalle@kernel.org Cc: linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, miquel.raynal@bootlin.com, pratyush@kernel.org, richard@nod.at, sanjaikumar.vs@dicortech.com, sanjaikumarvs@gmail.com, stable@vger.kernel.org, tudor.ambarus@linaro.org, vigneshr@ti.com Subject: [PATCH v4 0/2] mtd: spi-nor: Fix SST AAI write mode Date: Wed, 11 Mar 2026 10:30:55 +0000 Message-ID: <20260311103057.29-1-sanjaikumarvs@gmail.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Sanjaikumar V S This patch series addresses two distinct problems affecting SST flash Auto Address Increment write functionality: 1. When writes begin at odd addresses, a single byte is programmed first using byte program command, which clears the Write Enable Latch. The driver fails to re-enable writes before the AAI sequence. 2. When the SPI controller lacks direct mapping support, the fallback path uses a probe-time operation template with standard page program opcodes instead of AAI opcodes. Changes in v4: - Resent as new thread (v3 was incorrectly sent as reply to v2) - Patch 2/2: Added Fixes tag Changes in v3: - Patch 1/2: Use local boolean 'needs_write_enable' for clarity as suggested by Michael Walle - Patch 1/2: Improved comment explaining the fix - Patch 1/2: Added Fixes tag Changes in v2: - Split fixes into separate patches - Added detailed commit messages Sanjaikumar V S (2): mtd: spi-nor: sst: Fix write enable before AAI sequence mtd: spi-nor: core: Fix AAI mode when dirmap is not available drivers/mtd/spi-nor/core.c | 2 +- drivers/mtd/spi-nor/sst.c | 13 +++++++++++++ 2 files changed, 14 insertions(+), 1 deletion(-) -- 2.43.0