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Thu, 8 Aug 2024 10:43:58 +0000 Message-ID: Date: Thu, 8 Aug 2024 13:43:54 +0300 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] drm/panthor: Add DEV_QUERY_TIMESTAMP_INFO dev query To: Mary Guillemard Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, kernel@collabora.com, Christopher Healy , Boris Brezillon , Steven Price , Liviu Dudau , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , nd@arm.com References: <20240807153553.142325-2-mary.guillemard@collabora.com> <327a3440-8d01-4787-83be-a00fbbe0b593@arm.com> Content-Language: en-US From: Mihail Atanassov In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: WA2P291CA0048.POLP291.PROD.OUTLOOK.COM (2603:10a6:1d0:1f::10) To AS8PR08MB6263.eurprd08.prod.outlook.com (2603:10a6:20b:290::9) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: AS8PR08MB6263:EE_|GV1PR08MB10717:EE_|AMS0EPF0000019B:EE_|AM8PR08MB6466:EE_ X-MS-Office365-Filtering-Correlation-Id: 4c87ac15-470d-4a73-5b60-08dcb79709bf X-LD-Processed: f34e5979-57d9-4aaa-ad4d-b122a662184d,ExtAddr x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|376014|7416014|1800799024|366016; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Aug 2024 10:44:11.0779 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4c87ac15-470d-4a73-5b60-08dcb79709bf X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AMS0EPF0000019B.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR08MB6466 On 08/08/2024 13:24, Mary Guillemard wrote: >> As it stands, this query has nothing to do with the actual GPU so >> doesn't really belong here. >> >> It'd be more valuable, and can maybe give better calibration results >> than querying the system timestamp separately in userspace, if you >> reported all of: >> * the system timer value >> * the system timer frequency >> * the GPU timer value >> * the GPU timer frequency (because it _could_ be different in some systems) >> * the GPU timer offset > > I see, I missed those registers... I will also fix this on my v2 of my Panfrost series. > > From my understanding, the GPU timer frequency doesn't have a register > so I suppose it would be wired to cntfrq_el0 if CONFIG_ARM_ARCH_TIMER is > set, am I correct? Barring any HW errata, yes, that's the frequency the GPU timer should tick at, too. > > Thanks for the review, > > Mary -- Mihail Atanassov