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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ad2198532d7sm143701966b.170.2025.05.09.05.37.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 09 May 2025 05:37:49 -0700 (PDT) Message-ID: <1f6fcbed-c7c4-42c2-814b-3834b08c5977@oss.qualcomm.com> Date: Fri, 9 May 2025 14:37:47 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFT 07/14] drm/msm/a6xx: Resolve the meaning of UBWC_MODE To: Connor Abbott , Konrad Dybcio Cc: Bjorn Andersson , Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Akhil P Oommen , Sean Paul , David Airlie , Simona Vetter , Marijn Suijten , linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org References: <20250508-topic-ubwc_central-v1-0-035c4c5cbe50@oss.qualcomm.com> <20250508-topic-ubwc_central-v1-7-035c4c5cbe50@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=PMAP+eqC c=1 sm=1 tr=0 ts=681df720 cx=c_pps a=WeENfcodrlLV9YRTxbY/uA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=dt9VzEwgFbYA:10 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=hjmfpjirZ_eXqKrHEEEA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=kacYvNCVWA4VmyqE58fU:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTA5MDEyMyBTYWx0ZWRfXwJkPz+1tmH5j jwkFfFP/vtEE4DJPwsFUt5zQ/uoLJWB0ERwunuOVtqw7luZ28/G1/hOwiIrvqeS1yVy7GhoVgKr jWQEW+3O+lSFUb/Ftug2RSp4slGuVvpC7drPcbAqwSHUtE1CfTn1Hs6yAVFTTa5FvlJFIiyAkCf 3AB7mSU2bhWLfuLJmU5evp1dsjYMqjvdZ+RQCkn6u2/u1cX9TjgXzf9lZixoOLSYARqjda2dLlT AgLez+p//vFUyCeFpvzmtLQ3yMwKrxQuMxtXJvWu+05OYXG3v2RqK8B+kysHPppIQLLK+JhPNdF ZYK+gICxyqxb98LJHdcOdCQm4qkXtwVvGM2sztxgsaek4cVBEiCbJKdjScJXp4tSZy0bOI1JhES 5mVXO90iqkhE/5Pje5jm2YincRf1nTmS0B0fH5gRgaeIcUct5J+GBWhEi94ZYshF7zotmYQA X-Proofpoint-GUID: bHTgMtBYXdGC0NJQJSA_FW5n_NdM51Ow X-Proofpoint-ORIG-GUID: bHTgMtBYXdGC0NJQJSA_FW5n_NdM51Ow X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-09_05,2025-05-08_04,2025-02-21_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 impostorscore=0 mlxscore=0 suspectscore=0 spamscore=0 bulkscore=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 mlxlogscore=902 adultscore=0 malwarescore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2504070000 definitions=main-2505090123 On 5/8/25 8:25 PM, Connor Abbott wrote: > On Thu, May 8, 2025 at 2:14 PM Konrad Dybcio wrote: >> >> From: Konrad Dybcio >> >> This bit is set iff the UBWC version is 1.0. That notably does not >> include QCM2290's "no UBWC". > > While this is technically true, AFAIK the only difference between UBWC > 1.0 and 2.0 is that newer UBWC disables level 1 bank swizzling, which > is why I originally wrote it this way. There's a bit of redundancy > between the UBWC version and ubwc_swizzle bit 0. It turns out to be a hardware matter Konrad