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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b486970b0c7sm1705829566b.57.2025.10.08.04.35.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 Oct 2025 04:35:55 -0700 (PDT) Message-ID: Date: Wed, 8 Oct 2025 13:35:53 +0200 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/9] dma: qcom: bam_dma: Fix command element mask field for BAM v1.6.0+ To: Md Sadre Alam , broonie@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, andersson@kernel.org, konradybcio@kernel.org, vkoul@kernel.org, linux-arm-msm@vger.kernel.org, linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org Cc: quic_varada@quicinc.com References: <20250918094017.3844338-1-quic_mdalam@quicinc.com> <20250918094017.3844338-4-quic_mdalam@quicinc.com> <2394e63f-1df7-764e-5489-3567065707a1@quicinc.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <2394e63f-1df7-764e-5489-3567065707a1@quicinc.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: vxqk_My5TJoimwasXyrEBm7bNmNdta6A X-Proofpoint-ORIG-GUID: vxqk_My5TJoimwasXyrEBm7bNmNdta6A X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDA2MDE2OCBTYWx0ZWRfXyUFONQ9FaH5f G2XkltrXUIuoysWAxWVpct9QlUjw93wQ05RrIBz3hbEz2Ni5GO2RL6ntq48T0kvWd4/4gDwKrJ3 ZbG2YShD68p9J8xPXc+Oiv2VW2Op99WcjwHtoVS/yGvMApenYWtE/F5lPCbW7L/XoFY+rsOfhJW JotVG2tM2wpSmQueXV/u2ovj66p/Bu6AMS5NdLhOC5RKXcWyMgUcjx5grg1KOUEIOeS5n7qoQIR 1QTbUJZmElu0pUZBkWuoCCAVfgmhHg2OZVaC0iHaPOk0n/FeW3ysJFyRsR+O+aA3rcTfGUZ/6uB /Bowtx9LIoE9nl4JXY6ejWXXodwvhjPKq1GzsC/BcyvhgZalVAcK27s6vchFpBYbV8v4z+mmoUK 4mod6qJmqgt//puDYl6JtCa+7LttsQ== X-Authority-Analysis: v=2.4 cv=BuCQAIX5 c=1 sm=1 tr=0 ts=68e64c9e cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=x6icFKpwvdMA:10 a=W9ArKkagtRzJc8iw_qMA:9 a=QEXdDO2ut3YA:10 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-08_03,2025-10-06_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 bulkscore=0 adultscore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 clxscore=1015 spamscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2509150000 definitions=main-2510060168 On 9/19/25 7:56 AM, Md Sadre Alam wrote: > > > On 9/18/2025 3:57 PM, Konrad Dybcio wrote: >> On 9/18/25 11:40 AM, Md Sadre Alam wrote: >>> 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. >> >> So the hardware can read from higher addresses but not write to them? > No, > Write Operations: Can target any 32-bit address in the peripheral address space (up to 4GB) > > Read Operations: Can read from any 32-bit peripheral address and > place the data into 36-bit memory addresses (up to 64GB) starting > from BAM v1.6.0 OK I misread your commit message [...] > For Read Commands: > - BAM < v1.6.0: 3rd Dword completely ignored by hardware > - BAM >= v1.6.0: 3rd Dword[3:0] contains upper 4 bits of destination > address This is important to point out. With that, the change looks sane indeed Konrad