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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2c1664a67b0sm54701935ad.80.2026.06.04.03.45.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Jun 2026 03:45:22 -0700 (PDT) Date: Thu, 4 Jun 2026 16:15:16 +0530 From: Varadarajan Narayanan To: Vinod Koul Cc: Frank Li , Abhishek Sahu , mani@kernel.org, linux-arm-msm@vger.kernel.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, Md Sadre Alam , lakshmi.d@oss.qualcomm.com Subject: Re: [PATCH v5] dma: qcom: bam_dma: Fix command element mask field for BAM v1.6.0+ Message-ID: References: <20260514-bam-fix-v5-1-58f6edb34969@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Proofpoint-GUID: Wllg6dIOhsOh1gHWaKcUWNITtyoao6O2 X-Proofpoint-ORIG-GUID: Wllg6dIOhsOh1gHWaKcUWNITtyoao6O2 X-Authority-Analysis: v=2.4 cv=A91c+aWG c=1 sm=1 tr=0 ts=6a215743 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=kj9zAlcOel0A:10 a=FelO9ux0wxsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=jG7jI5RKT-kwyRtthR8A:9 a=CjuIK1q_8ugA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjA0MDEwMiBTYWx0ZWRfXw7n4URoxltej 02LytGKrUeZHIJi5FAdEwdoje5YSxrb4bXzmWatxAYGoIyYaf1sJ1DLi2KJHLQ1sj3UKTIHEaEk l6gyZMyrO2tRdOyGvVCjWIx9jyb62JLOTjObbUX1OBdsW8X01wgDDlZiRNutRkFIjggRrssqIis mUfKvtFPRctVoR+uXnrHVObUdeUOrPrMYQUj44FDnNhCViwx1IQzwPPtf7UrCnlPKEMziVZwbgV Hk7zi9DG0pC3sV4TMhXuhTkj/VH3YqN+5hknr8Le6TzhKj6mvC3erPXRVkfNMjSuyrGAqcgb+mA hPZa9RlMiwJgq1KENIGRXCq7gnui5MWLswLjOUAD8TMGV/hcaMLG0gy+N0nnh0ACNsgBPzmhj0U INqdttecud80LjqZPJyp+aHtwGpmUBaP2RCdRUUaVUdiEauedDB7f453Rs0ey/VxlZ3iZLS2/gD B+BTpGEy2IHg6ytasRg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-04_03,2026-05-28_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 spamscore=0 suspectscore=0 malwarescore=0 bulkscore=0 lowpriorityscore=0 adultscore=0 clxscore=1015 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606040102 On Tue, May 19, 2026 at 11:01:51PM +0530, Vinod Koul wrote: > On 14-05-26, 12:09, Varadarajan Narayanan wrote: > > From: Md Sadre Alam > > > > BAM version 1.6.0 and later changed the behavior of the mask field in > > command elements for read operations. In newer BAM versions, the mask > > field for read commands contains the upper 4 bits of the destination > > address to support 36-bit addressing, while for write commands it > > continues to function as a traditional write mask. > > But this changes behaviour for all versions. What happens to folks on older > versions, wont this break for them, if not what am I missing Md Alam, Can you please respond to Vinod's query. -Varada [ . . . ]