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Wed, 09 Sep 2026 11:31:49 -0700 (PDT) X-Received: by 2002:a17:90a:d406:b0:395:4de5:1054 with SMTP id 98e67ed59e1d1-39d70b4e3bfmr3896632a91.16.1788978709223; Wed, 09 Sep 2026 11:31:49 -0700 (PDT) Received: from [10.204.104.211] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-14324410092sm42858991c88.14.2026.09.09.11.31.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 09 Sep 2026 11:31:48 -0700 (PDT) Message-ID: <33be46a9-207d-4f0d-b3e8-18adb8197a57@oss.qualcomm.com> Date: Thu, 10 Sep 2026 00:01:41 +0530 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 2/2] drm/msm/a6xx: Use CX AO Counter register for timestamp on a750 GPUs To: Neil Armstrong Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Rob Clark , Sean Paul , Konrad Dybcio , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Marijn Suijten , David Airlie , Simona Vetter References: <20260908-topic-sm8650-gmu-a750-timestamp-reg-v1-0-284880d6e68b@linaro.org> <20260908-topic-sm8650-gmu-a750-timestamp-reg-v1-2-284880d6e68b@linaro.org> Content-Language: en-US From: Akhil P Oommen In-Reply-To: <20260908-topic-sm8650-gmu-a750-timestamp-reg-v1-2-284880d6e68b@linaro.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=M+997Sws c=1 sm=1 tr=0 ts=6aa1a616 cx=c_pps a=0uOsjrqzRL749jD1oC5vDA==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=KKAkSRfTAAAA:8 a=ubtBxe2QYwUAodWgXbcA:9 a=QEXdDO2ut3YA:10 a=mQ_c8vxmzFEMiUWkPHU9:22 a=cvBusfyB2V15izCimMoJ:22 X-Proofpoint-GUID: PD9mpfRftFs93MW-c7BptlHKzWk9d6Zi X-Proofpoint-ORIG-GUID: PD9mpfRftFs93MW-c7BptlHKzWk9d6Zi X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA5MDIwNyBTYWx0ZWRfX4+4t49azPflP Gk4tMf2tmUIg9gT9S1z9Q7zfqwD/A5B8TTGsWd80PzoqH4fCaj/HFlJuLkAT0sm9Cg8D4+x67ry 4qMonCjxrTvPhA502wNJBxQMMBld9Jg= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA5MDIwNyBTYWx0ZWRfX/IHeHs2+N7IK 75y/mTe8L6UCdWfR48+/8NQdbniXPXtgl2rawPYaOW7Ju9U2ZbgOZqGw9DESqCfGkh0tkogA/FI k+X1U4h5AUABuB3sKQIHPrAudeFjDFvr06J0J5fAoUwijGx+gekDgxdY6Y0jVfvdxWH+G5G4BAu K2Bvx54kiAr3F/km5MmVgvpX7XmOwIuc7qb/2FOWVP6c/L2zwYEVXBm+qt0NxAZS8kgpGL8Zm+x 0OoEyy9oBc4wn3hBICHfEyIkm07oEz1TXoQdlFo73c9G/OK59SjGq61tvWkFiFXa5iOLQ7Yl8b0 cLD9GpZrlbeii5wmP7Tc8yxQst58bLKIC5YzZJgPMAlK4QWWOZ/smyZAbgP1m/n3vKfjpDroEB/ HXoYbVMP9nuPX6u5nY5zPuRRbAxjcWWmG5zve6IcG+mNoa3lCnKpYJZg6XTE5nwmcE3j+NdSOvo iHZBjwrY5LV+mFYSOaQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-08_03,2026-09-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 bulkscore=0 spamscore=0 phishscore=0 impostorscore=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609090207 On 9/8/2026 6:54 PM, Neil Armstrong wrote: > The a750 uses the CX AO Counters instead of the GMU_ALWAYS_ON_COUNTER > register on A6xx and other A7xx GPUs, use it when running a A750 GPU. Do you see any difference in behavior? Both counters are synchronized. -Akhil. > > Signed-off-by: Neil Armstrong > --- > drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 12 +++++++++--- > 1 file changed, 9 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c > index f9de9329dee3..081e79ea4652 100644 > --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c > +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c > @@ -23,9 +23,15 @@ static u64 a6xx_gmu_get_timestamp(struct msm_gpu *gpu) > u64 count_hi, count_lo, temp; > > do { > - count_hi = gmu_read(&a6xx_gpu->gmu, REG_A6XX_GMU_ALWAYS_ON_COUNTER_H); > - count_lo = gmu_read(&a6xx_gpu->gmu, REG_A6XX_GMU_ALWAYS_ON_COUNTER_L); > - temp = gmu_read(&a6xx_gpu->gmu, REG_A6XX_GMU_ALWAYS_ON_COUNTER_H); > + if (adreno_is_a750_family(adreno_gpu)) { > + count_hi = gmu_read(&a6xx_gpu->gmu, REG_A7XX_GMU_CX_AO_COUNTER_H); > + count_lo = gmu_read(&a6xx_gpu->gmu, REG_A7XX_GMU_CX_AO_COUNTER_L); > + temp = gmu_read(&a6xx_gpu->gmu, REG_A7XX_GMU_CX_AO_COUNTER_H); > + } else { > + count_hi = gmu_read(&a6xx_gpu->gmu, REG_A6XX_GMU_ALWAYS_ON_COUNTER_H); > + count_lo = gmu_read(&a6xx_gpu->gmu, REG_A6XX_GMU_ALWAYS_ON_COUNTER_L); > + temp = gmu_read(&a6xx_gpu->gmu, REG_A6XX_GMU_ALWAYS_ON_COUNTER_H); > + } > } while (unlikely(count_hi != temp)); > > return (count_hi << 32) | count_lo; >