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Mon, 8 Apr 2019 12:15:21 +0300 (EEST) Date: Mon, 8 Apr 2019 12:15:21 +0300 From: Peter De Schrijver To: Thierry Reding Subject: Re: [PATCH 2/8] clk: tegra: clock changes for emc scaling support on Tegra210 Message-ID: <20190408091521.GC12975@pdeschrijver-desktop.Nvidia.com> References: <20190325074523.26456-1-josephl@nvidia.com> <20190325074523.26456-3-josephl@nvidia.com> <20190403092250.GG5238@ulmo> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190403092250.GG5238@ulmo> X-NVConfidentiality: public User-Agent: Mutt/1.9.4 (2018-02-28) X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL108.nvidia.com (172.18.146.13) To HQMAIL101.nvidia.com (172.20.187.10) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1554715193; bh=qZ/0BVxdGvFM/MJMBzrJI7TIJp88XjuKWlDfuOTvVPA=; h=X-PGP-Universal:Date:From:To:CC:Subject:Message-ID:References: MIME-Version:Content-Type:Content-Disposition:In-Reply-To: X-NVConfidentiality:User-Agent:X-Originating-IP:X-ClientProxiedBy; b=D+8Aa0uIiGSVbKBHesCGlN2y9XjlTtN5qsconDomyEjkw2EOuRLNxQ0wPNiK+qp3T lAGMkIoArn79gpKTN/3shIfS9hcLxkB2FzJ+WIEdVBG8Akq/UbASjN/dPDJkhk//Ct et3c3II5Sy2196Br7QcDlm8L51ZAOmKJpJRiTWC0m01lzQjAWMIdz6VXIWQJlFTFqK OR1pYbe16i3ewaW8A7Hl6Naoqkb2YRZnMEMYkquL53T+dBDduvUKFxx/lVy9+xmIlQ dXjiQQ/AsdrvnfZ6yFdHfWRgtZ5gbLpGW7sPdMG22FvVqYZEcLZsU6RcJ4IvhUKu/8 WNxixeLXhgW4A== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190408_021950_106679_A17790A1 X-CRM114-Status: GOOD ( 22.20 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Stephen Boyd , Jonathan Hunter , Rob Herring , Joseph Lo , linux-tegra@vger.kernel.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Apr 03, 2019 at 11:22:50AM +0200, Thierry Reding wrote: > On Mon, Mar 25, 2019 at 03:45:17PM +0800, Joseph Lo wrote: > > 1) Introduce low jitter paths for pllp and pll_mb used by the EMC driver. > > 2) Remove the old emc_mux clock and don't use the common EMC clock > > definition. This will be replaced by a new clock defined in the EMC > > driver. > > 3) Export functions to allow accessing the CAR register required for EMC > > clock scaling. These functions will be used to access the CAR register > > as part of the scaling sequence. > > The fact that you can enumerate 3 logical changes made by this commit > indicates that it should be split up into smaller patches. > > > Based on the work of Peter De Schrijver . > > > > Signed-off-by: Joseph Lo > > --- > > drivers/clk/tegra/clk-tegra210.c | 112 +++++++++++++++++++---- > > include/dt-bindings/clock/tegra210-car.h | 4 +- > > include/linux/clk/tegra.h | 5 + > > 3 files changed, 103 insertions(+), 18 deletions(-) > > > > diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c > > index 7545af763d7a..e17b5279ea69 100644 > > --- a/drivers/clk/tegra/clk-tegra210.c > > +++ b/drivers/clk/tegra/clk-tegra210.c > > @@ -47,6 +47,7 @@ > > #define CLK_SOURCE_LA 0x1f8 > > #define CLK_SOURCE_SDMMC2 0x154 > > #define CLK_SOURCE_SDMMC4 0x164 > > +#define CLK_SOURCE_EMC_DLL 0x664 > > > > #define PLLC_BASE 0x80 > > #define PLLC_OUT 0x84 > > @@ -234,6 +235,10 @@ > > #define RST_DFLL_DVCO 0x2f4 > > #define DVFS_DFLL_RESET_SHIFT 0 > > > > +#define CLK_RST_CONTROLLER_CLK_OUT_ENB_X_SET 0x284 > > +#define CLK_RST_CONTROLLER_CLK_OUT_ENB_X_CLR 0x288 > > +#define CLK_OUT_ENB_X_CLK_ENB_EMC_DLL BIT(14) > > + > > #define CLK_RST_CONTROLLER_RST_DEV_Y_SET 0x2a8 > > #define CLK_RST_CONTROLLER_RST_DEV_Y_CLR 0x2ac > > > > @@ -319,12 +324,6 @@ static unsigned long tegra210_input_freq[] = { > > [8] = 12000000, > > }; > > > > -static const char *mux_pllmcp_clkm[] = { > > - "pll_m", "pll_c", "pll_p", "clk_m", "pll_m_ud", "pll_mb", "pll_mb", > > - "pll_p", > > -}; > > -#define mux_pllmcp_clkm_idx NULL > > - > > #define PLL_ENABLE (1 << 30) > > > > #define PLLCX_MISC1_IDDQ (1 << 27) > > @@ -2310,7 +2309,7 @@ static struct tegra_clk tegra210_clks[tegra_clk_max] __initdata = { > > [tegra_clk_i2c2] = { .dt_id = TEGRA210_CLK_I2C2, .present = true }, > > [tegra_clk_uartc_8] = { .dt_id = TEGRA210_CLK_UARTC, .present = true }, > > [tegra_clk_mipi_cal] = { .dt_id = TEGRA210_CLK_MIPI_CAL, .present = true }, > > - [tegra_clk_emc] = { .dt_id = TEGRA210_CLK_EMC, .present = true }, > > + [tegra_clk_emc] = { .dt_id = TEGRA210_CLK_EMC, .present = false }, > > [tegra_clk_usb2] = { .dt_id = TEGRA210_CLK_USB2, .present = true }, > > [tegra_clk_bsev] = { .dt_id = TEGRA210_CLK_BSEV, .present = true }, > > [tegra_clk_uartd_8] = { .dt_id = TEGRA210_CLK_UARTD, .present = true }, > > @@ -2921,6 +2920,82 @@ static int tegra210_init_pllu(void) > > return 0; > > } > > > > +void tegra210_clk_emc_dll_enable(bool flag) > > +{ > > + unsigned long flags = 0; > > + u32 offset = flag ? CLK_RST_CONTROLLER_CLK_OUT_ENB_X_SET : > > + CLK_RST_CONTROLLER_CLK_OUT_ENB_X_CLR; > > + > > + spin_lock_irqsave(&emc_lock, flags); > > + > > + writel_relaxed(CLK_OUT_ENB_X_CLK_ENB_EMC_DLL, clk_base + offset); > > + readl(clk_base + offset); > > + > > + spin_unlock_irqrestore(&emc_lock, flags); > > +} > > +EXPORT_SYMBOL_GPL(tegra210_clk_emc_dll_enable); > > + > > +void tegra210_clk_emc_dll_update_setting(u32 emc_dll_src_value) > > Do we really want to pass the whole register value through this > function? The register has three fields, so perhaps it's safer to pass > the fields individually? Or perhaps we only need to modify a subset of > the fields and can reduce the number of parameters we pass? Letting a > different driver pass any arbitrary value here takes away any means of > checking for validity. > The EMC scaling driver needs to modify all 3 fields. If the DDLL_CLK_SEL field would be fixed, this function could be left out and CCF be used instead. Peter. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel