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Age	Commit message (Collapse)	Author
2026-07-02	dmaengine: qcom: bam_dma: Fix command element mask field for BAM v1.6.0+	Md Sadre Alam
	BAM version 1.6.0 and later changed the behavior of the mask field in command elements for read operations. In older BAM versions, or prior implementation assumptions, the mask field was effectively ignored for read commands. However, starting from BAM v1.6.0, the mask field for read commands is repurposed to carry the upper 4 bits of the destination address, enabling support for 36-bit addressing. For write commands, the mask field continues to function as a traditional write mask. The current driver sets mask = 0xffffffff for all command elements. While this works for write operations, it breaks read operations on BAM v1.6.0+ hardware. In such cases, the hardware interprets the upper address bits as 0xf, resulting in an invalid destination address (0xf_xxxxxxxx instead of 0x0_xxxxxxxx). This leads to failures such as NAND enumeration issues observed on platforms like IPQ5424. Fix this by assigning the mask field based on command type: - For read commands: set mask = 0 (upper address bits = 0) - For write commands: retain mask = 0xffffffff Also update the bam_cmd_element structure documentation to reflect the dual purpose of the mask field across BAM versions. This ensures correct behavior on BAM v1.6.0+ while maintaining backward compatibility with older hardware. Fixes: dfebb055f73a2 ("dmaengine: qcom: bam_dma: wrapper functions for command descriptor") Tested-by: Lakshmi Sowjanya D <lakshmi.d@oss.qualcomm.com> Signed-off-by: Md Sadre Alam <md.alam@oss.qualcomm.com> Reviewed-by: Frank Li <Frank.Li@nxp.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> Cc: stable@vger.kernel.org Signed-off-by: Varadarajan Narayanan <varadarajan.narayanan@oss.qualcomm.com> Link: https://patch.msgid.link/20260615060908.1263171-1-varadarajan.narayanan@oss.qualcomm.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-06-05	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282	Thomas Gleixner
	Based on 1 normalized pattern(s): this software is licensed under the terms of the gnu general public license version 2 as published by the free software foundation and may be copied distributed and modified under those terms this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 285 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141900.642774971@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-08-28	dmaengine: qcom: bam_dma: wrapper functions for command descriptor	Abhishek Sahu
	QCOM BAM also supports command descriptor which allows the SW to create descriptors of type command which does not generate any data transmissions but configures registers in the peripheral. In command descriptor the 32bit address point to the start of the command block which holds the command elements and the 16bit size define the size of the command block. Each Command Element is structured by 4 words: Write command: address + cmd register data register mask reserved Read command: address + cmd read data result address, reserved reserved This patch creates a new header file for BAM driver which contains the structures and wrapper functions for command descriptor. This file will be used by different QCOM peripheral drivers for forming the command descriptor Signed-off-by: Abhishek Sahu <absahu@codeaurora.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>