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Fri, 20 Sep 2024 06:42:23 -0700 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by MTKMBS14N1.mediatek.inc (172.21.101.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Fri, 20 Sep 2024 21:42:21 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Fri, 20 Sep 2024 21:42:21 +0800 From: Pablo Sun To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , Michael Turquette , Stephen Boyd , "Srinivas Kandagatla" CC: , , , , , Pablo Sun Subject: [PATCH 2/5] clk: mediatek: clk-mt8188-topckgen: Remove univpll from parents of mfg_core_tmp Date: Fri, 20 Sep 2024 21:41:08 +0800 Message-ID: <20240920134111.19744-3-pablo.sun@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20240920134111.19744-1-pablo.sun@mediatek.com> References: <20240920134111.19744-1-pablo.sun@mediatek.com> MIME-Version: 1.0 X-TM-AS-Product-Ver: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-AS-Result: No-10--3.220100-8.000000 X-TMASE-MatchedRID: 6mUaupESUicX/DgtOsKbJEKcYi5Qw/RVYU4M4UEhdYoOUs4CTUgKy6dy K1rXVA/F9tuSNsrGP8feAMGbXnKiN7UN8Yzp1vtfA9lly13c/gHt/okBLaEo+IWXGHd13QwAo8W MkQWv6iXBcIE78YqRWo6HM5rqDwqt4XgtCAUmrqUKYfTzGGy8aC9j0U24TSafOrFVoj5IqtJ8dr /u/DLEnwHOhuuQEdvLcdzPe3Qcn3bSiULcJKjUyoEDzLGQCF4vwZBgUyJVEbl6Fw8/PpTMRaVvm iAyeA2kc5MSfkiJFI5QBJtcKcOYfpRMZUCEHkRt X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--3.220100-8.000000 X-TMASE-Version: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-SNTS-SMTP: E9E4C39A28787342393ECA9258E7290EA1B256B30B3614CD06F8F7BD2D4C723A2000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240920_064225_535141_43413B01 X-CRM114-Status: GOOD ( 12.57 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Same as MT8195, MT8188 GPU clock is primarly supplied by the dedicated mfgpll. The clock "mfg_core_tmp" is only used as an alt clock when setting mfgpll clock rate. If we keep the univpll parents from mfg_core_tmp, when setting GPU frequency to 390000000, the common clock framework would switch the parent to univpll, instead of setting mfgpll to 390000000: mfgpll 0 0 0 949999756 univpll 2 2 0 2340000000 univpll_d6 1 1 0 390000000 top_mfg_core_tmp 1 1 0 390000000 mfg_ck_fast_ref 1 1 0 390000000 mfgcfg_bg3d 1 1 0 390000000 This results in failures when subsequent devfreq operations need to switch to other frequencies. So remove univpll from the parent list. This solution is taken from commit 72d38ed720e9 ("clk: mediatek: clk-mt8195-topckgen: Drop univplls from mfg mux parents") Signed-off-by: Pablo Sun Reviewed-by: AngeloGioacchino Del Regno --- drivers/clk/mediatek/clk-mt8188-topckgen.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/clk/mediatek/clk-mt8188-topckgen.c b/drivers/clk/mediatek/clk-mt8188-topckgen.c index 2ccc8a1c98f9..74ee692ac613 100644 --- a/drivers/clk/mediatek/clk-mt8188-topckgen.c +++ b/drivers/clk/mediatek/clk-mt8188-topckgen.c @@ -342,11 +342,14 @@ static const char * const dsp7_parents[] = { "univpll_d3" }; +/* + * MFG can be also parented to "univpll_d6" and "univpll_d7": + * these have been removed from the parents list to let us + * achieve GPU DVFS without any special clock handlers. + */ static const char * const mfg_core_tmp_parents[] = { "clk26m", "mainpll_d5_d2", - "univpll_d6", - "univpll_d7" }; static const char * const camtg_parents[] = {