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ziggy.stardust ([37.223.147.22]) by smtp.gmail.com with ESMTPSA id g9sm3520290wmf.19.2019.02.26.07.59.52 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Tue, 26 Feb 2019 07:59:52 -0800 (PST) Subject: Re: [PATCH v4 01/12] clk: mediatek: Disable tuner_en before change PLL rate To: Weiyi Lu , Nicolas Boichat , Stephen Boyd , Rob Herring Cc: James Liao , Fan Chen , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-clk@vger.kernel.org, srv_heupstream@mediatek.com, stable@vger.kernel.org, Owen Chen References: <20190201083016.25856-1-weiyi.lu@mediatek.com> <20190201083016.25856-3-weiyi.lu@mediatek.com> From: Matthias Brugger Openpgp: preference=signencrypt Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata= mQINBFP1zgUBEAC21D6hk7//0kOmsUrE3eZ55kjc9DmFPKIz6l4NggqwQjBNRHIMh04BbCMY fL3eT7ZsYV5nur7zctmJ+vbszoOASXUpfq8M+S5hU2w7sBaVk5rpH9yW8CUWz2+ZpQXPJcFa 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Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: <20190201083016.25856-3-weiyi.lu@mediatek.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/02/2019 09:30, Weiyi Lu wrote: > From: Owen Chen > > PLLs with tuner_en bit, such as APLL1, need to disable > tuner_en before apply new frequency settings, or the new frequency > settings (pcw) will not be applied. > The tuner_en bit will be disabled during changing PLL rate > and be restored after new settings applied. > Another minor change is to correct the macro name of pcw change bit > to CON1_PCW_CHG because PCW_CHG(BIT31) is on CON1. > > Fixes: e2f744a82d725 (clk: mediatek: Add MT2712 clock support) > Cc: > Signed-off-by: Owen Chen > --- > drivers/clk/mediatek/clk-pll.c | 33 +++++++++++++++++++++++++++++++-- > 1 file changed, 31 insertions(+), 2 deletions(-) > > diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c > index f54e4015b0b1..f0ff5f535c7e 100644 > --- a/drivers/clk/mediatek/clk-pll.c > +++ b/drivers/clk/mediatek/clk-pll.c > @@ -27,7 +27,7 @@ > #define CON0_BASE_EN BIT(0) > #define CON0_PWR_ON BIT(0) > #define CON0_ISO_EN BIT(1) > -#define CON0_PCW_CHG BIT(31) > +#define CON1_PCW_CHG BIT(31) > > #define AUDPLL_TUNER_EN BIT(31) > > @@ -93,9 +93,31 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw, > { > u32 con1, val; > int pll_en; > + u32 tuner_en = 0; > + u32 tuner_en_mask; > + void __iomem *tuner_en_addr = NULL; > > pll_en = readl(pll->base_addr + REG_CON0) & CON0_BASE_EN; > > + /* disable tuner */ > + if (pll->tuner_en_addr) { > + tuner_en_addr = pll->tuner_en_addr; > + tuner_en_mask = BIT(pll->data->tuner_en_bit); > + } else if (pll->tuner_addr) { > + tuner_en_addr = pll->tuner_addr; > + tuner_en_mask = AUDPLL_TUNER_EN; > + } > + > + if (tuner_en_addr) { > + val = readl(tuner_en_addr); > + tuner_en = val & tuner_en_mask; > + > + if (tuner_en) { > + val &= ~tuner_en_mask; > + writel(val, tuner_en_addr); > + } > + } > + Why don't we use a flag here, it would make the code easier to understand. I think it would also help if you put this code in a separate function. Regards, Matthias > /* set postdiv */ > val = readl(pll->pd_addr); > val &= ~(POSTDIV_MASK << pll->data->pd_shift); > @@ -116,12 +138,19 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw, > con1 = readl(pll->base_addr + REG_CON1); > > if (pll_en) > - con1 |= CON0_PCW_CHG; > + con1 |= CON1_PCW_CHG; > > writel(con1, pll->base_addr + REG_CON1); > if (pll->tuner_addr) > writel(con1 + 1, pll->tuner_addr); > > + /* restore tuner_en */ > + if (tuner_en_addr && tuner_en) { > + val = readl(tuner_en_addr); > + val |= tuner_en_mask; > + writel(val, tuner_en_addr); > + } > + > if (pll_en) > udelay(20); > } >