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Date: Mon, 7 Jul 2014 18:26:33 -0700 From: Andrew Bresticker <abrestic@...omium.org> To: Mikko Perttunen <mperttunen@...dia.com> Cc: Stephen Warren <swarren@...dotorg.org>, Thierry Reding <thierry.reding@...il.com>, Tejun Heo <tj@...nel.org>, Peter De Schrijver <pdeschrijver@...dia.com>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>, linux-ide@...r.kernel.org Subject: Re: [PATCH v2 4/7] clk: tegra: Enable hardware control of SATA PLL On Wed, Jun 18, 2014 at 7:23 AM, Mikko Perttunen <mperttunen@...dia.com> wrote: > This makes the SATA PLL be controlled by hardware instead of software. > This is required for working SATA support. > > Signed-off-by: Mikko Perttunen <mperttunen@...dia.com> > Acked-by: Stephen Warren <swarren@...dia.com> I know Peter sent a pull request including this patch already, but I don't see it yet in Mike's tree, so perhaps it's possible to address my comment below (or else I'll include it in the next spin of my XUSB series. > diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c > @@ -1361,6 +1364,11 @@ static int clk_plle_tegra114_enable(struct clk_hw *hw) > val |= XUSBIO_PLL_CFG0_SEQ_ENABLE; > pll_writel(val, XUSBIO_PLL_CFG0, pll); > > + /* Enable hw control of SATA pll */ > + val = pll_readl(SATA_PLL_CFG0, pll); > + val &= ~SATA_PLL_CFG0_PADPLL_RESET_SWCTL; > + pll_writel(val, SATA_PLL_CFG0, pll); > + Apparently the procedure for enabling the SATA PLL for XUSB (when the SATA lane is used) is slightly different. Specifically, it would be: val = pll_readl(SATA_PLL_CFG0, pll); val &= ~SATA_PLL_CFG0_PADPLL_RESET_SWCTL; val |= SATA_PLL_CFG0_PADPLL_USE_LOCKDET; val |= SATA_PLL_CFG0_SEQ_START_STATE; pll_writel(val, SATA_PLL_CFG0, pll); udelay(1); val = pll_readl(SATA_PLL_CFG0, pll); val |= SATA_PLL_CFG0_SEQ_ENABLE; pll_writel(val, SATA_PLL_CFG0, pll); Do you know if this sequence also works when the SATA lane is used for SATA? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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