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[109.252.90.13]) by smtp.gmail.com with ESMTPSA id j1-v6sm39410536pfk.125.2018.07.24.09.43.41 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 24 Jul 2018 09:43:48 -0700 (PDT) From: Dmitry Osipenko To: Thierry Reding , Peter De Schrijver , Jonathan Hunter , Prashant Gaikwad , Michael Turquette , Stephen Boyd Cc: Rob Herring , linux-tegra@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 7/8] clk: tegra20: Check whether direct PLLM sourcing is turned off for EMC Date: Tue, 24 Jul 2018 19:42:20 +0300 Message-Id: <20180724164221.3307-8-digetx@gmail.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180724164221.3307-1-digetx@gmail.com> References: <20180724164221.3307-1-digetx@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Ensure that direct PLLM sourcing is turned off for EMC as we don't support that configuration in the clk driver. Signed-off-by: Dmitry Osipenko Acked-by: Peter De Schrijver --- drivers/clk/tegra/clk-tegra20.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/clk/tegra/clk-tegra20.c b/drivers/clk/tegra/clk-tegra20.c index 68551effb5ca..c71b61162a32 100644 --- a/drivers/clk/tegra/clk-tegra20.c +++ b/drivers/clk/tegra/clk-tegra20.c @@ -800,7 +800,9 @@ static struct tegra_periph_init_data tegra_periph_nodiv_clk_list[] = { static void __init tegra20_emc_clk_init(void) { + const u32 use_pllm_ud = BIT(29); struct clk *clk; + u32 emc_reg; clk = clk_register_mux(NULL, "emc_mux", mux_pllmcp_clkm, ARRAY_SIZE(mux_pllmcp_clkm), @@ -812,6 +814,14 @@ static void __init tegra20_emc_clk_init(void) &emc_lock); clks[TEGRA20_CLK_MC] = clk; + /* un-divided pll_m_out0 is currently unsupported */ + emc_reg = readl_relaxed(clk_base + CLK_SOURCE_EMC); + if (emc_reg & use_pllm_ud) { + pr_err("%s: un-divided PllM_out0 used as clock source\n", + __func__); + return; + } + /* * Note that 'emc_mux' source and 'emc' rate shouldn't be changed at * the same time due to a HW bug, this won't happen because we're -- 2.18.0