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bh=tBxxMeFHaNTIFVvrYkndR+gcWNWRWVLtfGRhdSP2/6o=; b=sHrHGthpynjybtW3iaYqn4VDz8W2mUnv6z71ZcETVBTQpDmc7sauHjv28wVIESNz/NT4JO /eVM/ApgVTwerUaZtR+crPq/PZ9QfQrPX1WDUb9R/U+hQMeqrmn84ffVdA6EYR8U8fVs6Q 6MKWrZ3VMg106rd65FLMhOoNk88XdMcm1C0OOax6wn91vCLFoo+dRCog61XZh0FdNhLrDV G4ztOUTIEG0WWo+/ygkJP0lKF5CIN1zlM1Yx+VoYodoBkIzP1n5ZyULYJ9x4RqUUP0uzUp U3GKlswqNYL8bbUzk07xidLNJSJeVygSFU7YDvFnpK2JjH330jL778xHvnsOSw== From: Frank Oltmanns To: =?utf-8?Q?Ond=C5=99ej?= Jirman Cc: Maxime Ripard , Chen-Yu Tsai , Maarten Lankhorst , Thomas Zimmermann , David Airlie , Daniel Vetter , Jernej Skrabec , Samuel Holland , Icenowy Zheng , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH] drm/sun4i: tcon: Support keeping dclk rate upon ancestor clock changes In-Reply-To: (=?utf-8?Q?=22Ond=C5=99ej?= Jirman"'s message of "Sun, 10 Mar 2024 23:23:57 +0100") References: <20240310-tcon_keep_stable_rate-v1-1-0296b0a85c02@oltmanns.dev> Date: Mon, 11 Mar 2024 09:53:41 +0100 Message-ID: <87le6pcfoq.fsf@oltmanns.dev> MIME-Version: 1.0 X-Rspamd-Queue-Id: 4TtVtf1CRMz9sZh X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240311_015354_549446_53727102 X-CRM114-Status: GOOD ( 15.82 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org SGVsbG8gT25kxZllaiwKCk9uIDIwMjQtMDMtMTAgYXQgMjM6MjM6NTcgKzAxMDAsIE9uZMWZZWog SmlybWFuIDx4QHhudXguZXU+IHdyb3RlOgo+IEhlbGxvIEZyYW5rLAo+Cj4gT24gU3VuLCBNYXIg MTAsIDIwMjQgYXQgMDI6MzI6MjlQTSArMDEwMCwgRnJhbmsgT2x0bWFubnMgd3JvdGU6Cj4+ICtz dGF0aWMgaW50IHN1bjRpX3JhdGVfcmVzZXRfbm90aWZpZXJfY2Ioc3RydWN0IG5vdGlmaWVyX2Js b2NrICpuYiwKPj4gKwkJCQkgICAgICB1bnNpZ25lZCBsb25nIGV2ZW50LCB2b2lkICpkYXRhKQo+ PiArewo+PiArCXN0cnVjdCBzdW40aV9yYXRlX3Jlc2V0X25iICpyYXRlX3Jlc2V0ID0gdG9fc3Vu NGlfcmF0ZV9yZXNldF9uYihuYik7Cj4+ICsKPj4gKwlpZiAoZXZlbnQgPT0gUE9TVF9SQVRFX0NI QU5HRSkKPj4gKwkJc2NoZWR1bGVfZGVsYXllZF93b3JrKCZyYXRlX3Jlc2V0LT5yZXNldF9yYXRl X3dvcmssIG1zZWNzX3RvX2ppZmZpZXMoMTAwKSk7Cj4KPiBJZiB5b3UgZ2V0IG11bHRpcGxlIHJl c2V0IG5vdGlmaWVyIGNhbGxzIHdpdGhpbiAxMDBtcyBvZiB0aGUgZmlyc3Qgb25lLAo+IHRoZSBk ZWxheSBmcm9tIHRoZSBsYXN0IG9uZSB3aWxsIG5vdCBiZSAxMDBtcywgc28gdGhpcyBtYXkgdmlv bGF0ZSBleHBlY3RhdGlvbnMKPiB5b3UncmUgZGVzY3JpYmluZyBpbiB0aGUgY29tbWl0IG1lc3Nh Z2UuCgpMZXQgbWUgc3RhcnQgYnkgc2F5aW5nLCB0aGUgaW1wbGljaXQgZXhwZWN0YXRpb24gaXMg dGhhdCB0aGUgbmV3IHVzZXIgb2YKcGxsLXZpZGVvMCB3aWxsIGdldCBhbiBleGNsdXNpdmUgbG9j ayBvbiBwbGwtdmlkZW8wIChvdGhlcndpc2UsCmRhdGEtY2xvY2sgd291bGQgcmVzZXQgcGxsLXZp ZGVvMCBhZnRlciB0aG9zZSAxMDBtcyByZW5kZXJpbmcgdGhlIHdob2xlCmVuZGVhdm9yIG9mIHRo ZSBuZXcgdXNlciBwb2ludGxlc3MpLiBUaGlzIGNvbnN0cmFpbnQgbWFrZXMgdGhlIGNoYW5jZXMK dGhhdCB0aGUgYWJvdmUgZXZlbnQgKHR3byBjb25zZWN1dGl2ZSByYXRlIGNoYW5nZXMgd2l0aGlu IDEwMG1zKSBvY2N1cnMKdmVyeSBzbGltLgoKVGhhdCBiZWluZyBzYWlkLCBJIGRvbid0IHNlZSBh IHByb2JsZW0gd2l0aCBjYW5jZWxsaW5nIHRoZSBkZWxheWVkIHdvcmsKb24gUFJFX1JBVEVfQ0hB TkdFIGFuZCByZXN0YXJ0aW5nIGl0IG9uIEFCT1JUX1JBVEVfQ0hBTkdFIGxpa2UgdGhpczoKCitz dGF0aWMgaW50IHN1bjRpX3JhdGVfcmVzZXRfbm90aWZpZXJfY2Ioc3RydWN0IG5vdGlmaWVyX2Js b2NrICpuYiwKKwkJCQkgICAgICB1bnNpZ25lZCBsb25nIGV2ZW50LCB2b2lkICpkYXRhKQorewor CXN0cnVjdCBzdW40aV9yYXRlX3Jlc2V0X25iICpyYXRlX3Jlc2V0ID0gdG9fc3VuNGlfcmF0ZV9y ZXNldF9uYihuYik7CisKKwlpZiAoZXZlbnQgPT0gUFJFX1JBVEVfQ0hBTkdFKSB7CisJCXJhdGVf cmVzZXQtPmlzX2NhbmNlbGxlZCA9IGNhbmNlbF9kZWxheWVkX3dvcmsoJnJhdGVfcmVzZXQtPnJl c2V0X3JhdGVfd29yayk7CisJfSBlbHNlIGlmICgoZXZlbnQgPT0gUE9TVF9SQVRFX0NIQU5HRSkg fHwKKwkJIChldmVudCA9PSBBQk9SVF9SQVRFX0NIQU5HRSkgJiYgcmF0ZV9yZXNldC0+aXNfY2Fu Y2VsbGVkKSB7CisJCXNjaGVkdWxlX2RlbGF5ZWRfd29yaygmcmF0ZV9yZXNldC0+cmVzZXRfcmF0 ZV93b3JrLCBtc2Vjc190b19qaWZmaWVzKDEwMCkpOworCQlyYXRlX3Jlc2V0LT5pc19jYW5jZWxs ZWQgPSBmYWxzZTsKKwl9CisKKwlyZXR1cm4gTk9USUZZX0RPTkU7Cit9CgpUaGUgbmVlZCBmb3Ig dGhpcyBuZXcgY29kZSBpcyBzbGltIChJTUhPKSBidXQgb24gdGhlIG90aGVyIGhhbmQgaXQKZG9l c24ndCBhZGQgbXVjaCBjb21wbGV4aXR5LiBJJ2xsIGFkZCBpdCBpbiBWMiBpbmNsdWRpbmcgdGhl CmlzX2NhbmNlbGxlZCBtZW1iZXIgaW4gc3VuNGlfcmF0ZV9yZXNldF9uYiBpZiBJIGRvbid0IHJl Y2VpdmUgYW55Cm9iamVjdGlvbnMgZHVyaW5nIHRoaXMgd2Vlay4KClRoYW5rcywKICBGcmFuawoK Pgo+IHNjaGVkdWxlX2RlbGF5ZWRfd29yayBkb2Vzbid0IHJlLXNjaGVkdWxlIHRoZSB3b3JrIGlm IGl0J3MgYWxyZWFkeSBwZW5kaW5nLgo+Cj4gS2luZCByZWdhcmRzLAo+IAlvLgoKX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBt YWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9s aXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=