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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b9c0cce9b2esm115233666b.26.2026.04.01.02.32.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 01 Apr 2026 02:32:39 -0700 (PDT) Message-ID: <387635e8-d49e-4e08-bd26-e76838bb27d5@oss.qualcomm.com> Date: Wed, 1 Apr 2026 11:32:36 +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 4/6] drm/msm/a8xx: use pipe protect slot 15 for last-span-unbound feature To: Alexander Koskovich , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Konrad Dybcio , Akhil P Oommen , Bjorn Andersson Cc: Luca Weiss , linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260331-adreno-810-v1-0-725801dbb12b@pm.me> <20260331-adreno-810-v1-4-725801dbb12b@pm.me> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260331-adreno-810-v1-4-725801dbb12b@pm.me> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAxMDA4NiBTYWx0ZWRfXzV4p+xZiqcyS uYd2+z5YVCHOVdZ0MQuKA7MwVF3b8IQ/bbV2ocZniEKqy6ClgM42zUlrxunSVhK4I6W9gEzaDqq YSQS7q1lWpVNMHXe8m6Xx8OJvgngO3amAIW+EvgyeNehDagMuRmVG+2fHPjWrj7WKcBF6VoLHDe vjTuuwFFmCSw8fq766QUCIfYy0x0hT+ksLFa1v5jyKM7JrbqTOYBS2Vq3fQ8SqI/ICU3UJo7du9 1Jj8OXTcbWC9zwItSmRCrx/X093jM7f16/1cQU5SR4KLeAYYILqQf2GNJlnCkNcsvD9WclOWgNS 12SloqMYe0OPvoH2jwhx3Z0j41wEjOMmmx3ypYkGp6olflykViGH4xznr9NUkVKJ++E9bvZLGrn l5ON48G+KmeXF7Opc8QNGAi+ET5NUGEyXksVSIw4LVq0IvFDQYKRir2UH++oz18rdXWtTZR5ibM tVwU5Jij7ubrLD8K0/g== X-Proofpoint-GUID: UoSauyBneQpHHjDlYAHqbWuLVDPjnZVK X-Authority-Analysis: v=2.4 cv=YsQChoYX c=1 sm=1 tr=0 ts=69cce63b cx=c_pps a=UgVkIMxJMSkC9lv97toC5g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=qGQNF-HaROJYSwuyTOwA:9 a=QEXdDO2ut3YA:10 a=1HOtulTD9v-eNWfpl4qZ:22 X-Proofpoint-ORIG-GUID: UoSauyBneQpHHjDlYAHqbWuLVDPjnZVK X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-01_03,2026-04-01_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 bulkscore=0 clxscore=1015 impostorscore=0 phishscore=0 lowpriorityscore=0 adultscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604010086 On 4/1/26 4:17 AM, Alexander Koskovich wrote: > A8XX GPUs have two sets of protect registers: 64 global slots and 16 > pipe specific slots. The last-span-unbound feature is only available > on pipe protect registers, and should always target pipe slot 15. > > This matches the downstream driver which hardcodes pipe slot 15 for > all A8XX GPUs (GRAPHICS.LA.15.0.r1) and resolves protect errors on > A810. > > Signed-off-by: Alexander Koskovich > --- > drivers/gpu/drm/msm/adreno/a8xx_gpu.c | 9 +++++---- > 1 file changed, 5 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/msm/adreno/a8xx_gpu.c b/drivers/gpu/drm/msm/adreno/a8xx_gpu.c > index 5af82d43f1e4..63387ee9b04a 100644 > --- a/drivers/gpu/drm/msm/adreno/a8xx_gpu.c > +++ b/drivers/gpu/drm/msm/adreno/a8xx_gpu.c > @@ -252,11 +252,12 @@ static void a8xx_set_cp_protect(struct msm_gpu *gpu) > } > > /* > - * Last span feature is only supported on PIPE specific register. > - * So update those here > + * Last span setting is only being applied to the last pipe specific > + * register. Hence duplicate the last span from protect reg into the > + * BR and BV protect reg pipe 15. > */ > - a8xx_write_pipe(gpu, PIPE_BR, REG_A8XX_CP_PROTECT_PIPE(protect->count_max), final_cfg); > - a8xx_write_pipe(gpu, PIPE_BV, REG_A8XX_CP_PROTECT_PIPE(protect->count_max), final_cfg); > + a8xx_write_pipe(gpu, PIPE_BR, REG_A8XX_CP_PROTECT_PIPE(15), final_cfg); > + a8xx_write_pipe(gpu, PIPE_BV, REG_A8XX_CP_PROTECT_PIPE(15), final_cfg); I think this is a better fix than: https://lore.kernel.org/linux-arm-msm/20260225-glymur-protect-fix-v1-1-0deddedf9277@oss.qualcomm.com/ which will let us bring back the BUILD_BUG_ON.. WDYT Akhil? FWIW KGSL just hardcodes the number 15 here as well.. may make it configurable if that ever changes Reviewed-by: Konrad Dybcio Konrad