From nobody Thu Nov 14 17:02:18 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7172DC4167B for ; Fri, 3 Nov 2023 10:26:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346327AbjKCK0J (ORCPT ); Fri, 3 Nov 2023 06:26:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41702 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230375AbjKCKZ5 (ORCPT ); Fri, 3 Nov 2023 06:25:57 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4561ED53; Fri, 3 Nov 2023 03:25:43 -0700 (PDT) Received: from IcarusMOD.eternityproject.eu (cola.collaboradmins.com [195.201.22.229]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: kholk11) by madras.collabora.co.uk (Postfix) with ESMTPSA id 355ED66073E0; Fri, 3 Nov 2023 10:25:41 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1699007142; bh=8pDdd4hAMsC3mfwpObknhb9PNQhaA8a+i3uaZQiNyLI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cbNLDN823fuVOuvF4orpZ1686iXAo2f6I+OGsoReLBQH8JuN5rXbaHZIlCJLPdLc7 smNU5S/iFo/MHx/2sv81wEEYx9Sap0odt73fO0WqV93Lmv8NZCoy8I4xyjKBVkyFJI ruyzK5xmYRqOk+L2fbdGb5Wl6uOV8xW4OkIVdci95ydCrUpO6o3c/MaB7U/Stzb6Df Xaz9KKBUzDxG0wXToIUxEq7j3U8ld5FmcSFJtOjJg5mQ3HSdFL5GanTKZBDgwO8mWz gWMgztqQ9JQPl/hD3u327Od4sWbTBO4D2dDFboLCGqwguWsXOubOC9pW66bMOt8Ouh g61vpuzLEadvQ== From: AngeloGioacchino Del Regno To: sboyd@kernel.org Cc: mturquette@baylibre.com, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, wenst@chromium.org, msp@baylibre.com, amergnat@baylibre.com, yangyingliang@huawei.com, u.kleine-koenig@pengutronix.de, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, kernel@collabora.com Subject: [PATCH v3 3/3] clk: mediatek: mt8188-topckgen: Refactor parents for top_dp/edp muxes Date: Fri, 3 Nov 2023 11:25:33 +0100 Message-ID: <20231103102533.69280-4-angelogioacchino.delregno@collabora.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231103102533.69280-1-angelogioacchino.delregno@collabora.com> References: <20231103102533.69280-1-angelogioacchino.delregno@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The top_dp and top_edp muxes can be both parented to either TVDPLL1 or TVDPLL2, two identically specced PLLs for the specific purpose of giving out pixel clock: this becomes a problem when the MediaTek DisplayPort Interface (DPI) driver tries to set the pixel clock rate. In the usecase of two simultaneous outputs (using two controllers), it was seen that one of the displays would sometimes display garbled output (if any at all) and this was because: - top_edp was set to TVDPLL1, outputting X GHz - top_dp was set to TVDPLL2, outputting Y GHz - mtk_dpi calls clk_set_rate(top_edp, Z GHz) - top_dp is switched to TVDPLL1 - TVDPLL1 changes its rate, top_edp outputs the wrong rate. - eDP display is garbled To solve this issue, remove all TVDPLL1 parents from `top_dp` and all TVDPLL2 parents from `top_edp`, plus, necessarily switch both clocks to use the new MUX_GATE_CLR_SET_UPD_INDEXED() macro to be able to use the right bit index for the new parents list. Signed-off-by: AngeloGioacchino Del Regno Reviewed-by: Alexandre Mergnat Reviewed-by: Chen-Yu Tsai Reviewed-by: Fei Shao Tested-by: Fei Shao --- drivers/clk/mediatek/clk-mt8188-topckgen.c | 27 +++++++++++----------- 1 file changed, 14 insertions(+), 13 deletions(-) diff --git a/drivers/clk/mediatek/clk-mt8188-topckgen.c b/drivers/clk/media= tek/clk-mt8188-topckgen.c index e330a4f9a0c3..f7ec599b20af 100644 --- a/drivers/clk/mediatek/clk-mt8188-topckgen.c +++ b/drivers/clk/mediatek/clk-mt8188-topckgen.c @@ -475,29 +475,28 @@ static const char * const sspm_parents[] =3D { "mainpll_d4_d2" }; =20 +/* + * Both DP/eDP can be parented to TVDPLL1 and TVDPLL2, but we force using + * TVDPLL1 on eDP and TVDPLL2 on DP to avoid changing the "other" PLL rate + * in dual output case, which would lead to corruption of functionality lo= ss. + */ static const char * const dp_parents[] =3D { "clk26m", - "tvdpll1_d2", "tvdpll2_d2", - "tvdpll1_d4", "tvdpll2_d4", - "tvdpll1_d8", "tvdpll2_d8", - "tvdpll1_d16", "tvdpll2_d16" }; +static const u8 dp_parents_idx[] =3D { 0, 2, 4, 6, 8 }; =20 static const char * const edp_parents[] =3D { "clk26m", "tvdpll1_d2", - "tvdpll2_d2", "tvdpll1_d4", - "tvdpll2_d4", "tvdpll1_d8", - "tvdpll2_d8", - "tvdpll1_d16", - "tvdpll2_d16" + "tvdpll1_d16" }; +static const u8 edp_parents_idx[] =3D { 0, 1, 3, 5, 7 }; =20 static const char * const dpi_parents[] =3D { "clk26m", @@ -1038,10 +1037,12 @@ static const struct mtk_mux top_mtk_muxes[] =3D { MUX_GATE_CLR_SET_UPD(CLK_TOP_SSPM, "top_sspm", sspm_parents, 0x080, 0x084, 0x088, 24, 4, 31, 0x08, 3), /* CLK_CFG_9 */ - MUX_GATE_CLR_SET_UPD(CLK_TOP_DP, "top_dp", - dp_parents, 0x08C, 0x090, 0x094, 0, 4, 7, 0x08, 4), - MUX_GATE_CLR_SET_UPD(CLK_TOP_EDP, "top_edp", - edp_parents, 0x08C, 0x090, 0x094, 8, 4, 15, 0x08, 5), + MUX_GATE_CLR_SET_UPD_INDEXED(CLK_TOP_DP, "top_dp", + dp_parents, dp_parents_idx, 0x08C, 0x090, 0x094, + 0, 4, 7, 0x08, 4), + MUX_GATE_CLR_SET_UPD_INDEXED(CLK_TOP_EDP, "top_edp", + edp_parents, edp_parents_idx, 0x08C, 0x090, 0x094, + 8, 4, 15, 0x08, 5), MUX_GATE_CLR_SET_UPD(CLK_TOP_DPI, "top_dpi", dpi_parents, 0x08C, 0x090, 0x094, 16, 4, 23, 0x08, 6), MUX_GATE_CLR_SET_UPD(CLK_TOP_DISP_PWM0, "top_disp_pwm0", --=20 2.42.0