linux-kernel - Re: [PATCH] clk: imx: imx8mq: fix sys2/3_pll_out

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Date:   Wed, 30 Oct 2019 09:33:09 +0000
From:   Abel Vesa <abel.vesa@....com>
To:     Shawn Guo <shawnguo@...nel.org>
CC:     Peng Fan <peng.fan@....com>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        Anson Huang <anson.huang@....com>,
        Jacky Bai <ping.bai@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Leonard Crestez <leonard.crestez@....com>
Subject: Re: [PATCH] clk: imx: imx8mq: fix sys2/3_pll_out_sels

On 19-10-28 16:53:00, Shawn Guo wrote:
> @Abel, comments?
> 

Looks good to me.

Reviewed-by: Abel Vesa <abel.vesa@....com>

> Shawn
> 
> On Thu, Oct 24, 2019 at 06:57:21AM +0000, Peng Fan wrote:
> > From: Peng Fan <peng.fan@....com>
> > 
> > The current clk tree shows:
> >  osc_25m                              9       11        0    25000000          0     0  50000
> >     sys2_pll1_ref_sel                 1        1        0    25000000          0     0  50000
> >        sys3_pll_out                   1        1        0    25000000          0     0  50000
> >     sys1_pll1_ref_sel                 2        2        0    25000000          0     0  50000
> >        sys2_pll_out                   6        6        0  1000000000          0     0  50000
> > 
> > It is not correct that sys3_pll_out use sys2_pll1_ref_sel as parent,
> > sys2_pll_out use sys1_pll1_ref_sel as parent.
> > 
> > According to the current imx_clk_sccg_pll design, it uses both
> > bypass1/2, however set bypass2 as 1 is not correct, because it will
> > make sys[x]_pll_out use wrong parent and might access wrong registers.
> > 
> > So correct bypass2 to 0 and fix sys2/3_pll_out_sels.
> > 
> > After fix, the tree shows:
> >  osc_25m                             10       12        0    25000000          0     0  50000
> >     sys3_pll1_ref_sel                 1        1        0    25000000          0     0  50000
> >        sys3_pll_out                   1        1        0    25000000          0     0  50000
> >     sys2_pll1_ref_sel                 1        1        0    25000000          0     0  50000
> >        sys2_pll_out                   6        6        0  1000000000          0     0  50000
> >     sys1_pll1_ref_sel                 1        1        0    25000000          0     0  50000
> >        sys1_pll_out                   5        5        0   800000000          0     0  50000
> > 
> > Fixes: e9dda4af685f ("clk: imx: Refactor entire sccg pll clk")
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >  drivers/clk/imx/clk-imx8mq.c | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/clk/imx/clk-imx8mq.c b/drivers/clk/imx/clk-imx8mq.c
> > index 05ece7b5da54..e17f0ebfacb0 100644
> > --- a/drivers/clk/imx/clk-imx8mq.c
> > +++ b/drivers/clk/imx/clk-imx8mq.c
> > @@ -35,8 +35,8 @@ static const char * const audio_pll2_bypass_sels[] = {"audio_pll2", "audio_pll2_
> >  static const char * const video_pll1_bypass_sels[] = {"video_pll1", "video_pll1_ref_sel", };
> >  
> >  static const char * const sys1_pll_out_sels[] = {"sys1_pll1_ref_sel", };
> > -static const char * const sys2_pll_out_sels[] = {"sys1_pll1_ref_sel", "sys2_pll1_ref_sel", };
> > -static const char * const sys3_pll_out_sels[] = {"sys3_pll1_ref_sel", "sys2_pll1_ref_sel", };
> > +static const char * const sys2_pll_out_sels[] = {"sys2_pll1_ref_sel", };
> > +static const char * const sys3_pll_out_sels[] = {"sys3_pll1_ref_sel", };
> >  static const char * const dram_pll_out_sels[] = {"dram_pll1_ref_sel", };
> >  static const char * const video2_pll_out_sels[] = {"video2_pll1_ref_sel", };
> >  
> > @@ -345,8 +345,8 @@ static int imx8mq_clocks_probe(struct platform_device *pdev)
> >  	clks[IMX8MQ_VIDEO_PLL1_OUT] = imx_clk_gate("video_pll1_out", "video_pll1_bypass", base + 0x10, 21);
> >  
> >  	clks[IMX8MQ_SYS1_PLL_OUT] = imx_clk_sccg_pll("sys1_pll_out", sys1_pll_out_sels, ARRAY_SIZE(sys1_pll_out_sels), 0, 0, 0, base + 0x30, CLK_IS_CRITICAL);
> > -	clks[IMX8MQ_SYS2_PLL_OUT] = imx_clk_sccg_pll("sys2_pll_out", sys2_pll_out_sels, ARRAY_SIZE(sys2_pll_out_sels), 0, 0, 1, base + 0x3c, CLK_IS_CRITICAL);
> > -	clks[IMX8MQ_SYS3_PLL_OUT] = imx_clk_sccg_pll("sys3_pll_out", sys3_pll_out_sels, ARRAY_SIZE(sys3_pll_out_sels), 0, 0, 1, base + 0x48, CLK_IS_CRITICAL);
> > +	clks[IMX8MQ_SYS2_PLL_OUT] = imx_clk_sccg_pll("sys2_pll_out", sys2_pll_out_sels, ARRAY_SIZE(sys2_pll_out_sels), 0, 0, 0, base + 0x3c, CLK_IS_CRITICAL);
> > +	clks[IMX8MQ_SYS3_PLL_OUT] = imx_clk_sccg_pll("sys3_pll_out", sys3_pll_out_sels, ARRAY_SIZE(sys3_pll_out_sels), 0, 0, 0, base + 0x48, CLK_IS_CRITICAL);
> >  	clks[IMX8MQ_DRAM_PLL_OUT] = imx_clk_sccg_pll("dram_pll_out", dram_pll_out_sels, ARRAY_SIZE(dram_pll_out_sels), 0, 0, 0, base + 0x60, CLK_IS_CRITICAL);
> >  	clks[IMX8MQ_VIDEO2_PLL_OUT] = imx_clk_sccg_pll("video2_pll_out", video2_pll_out_sels, ARRAY_SIZE(video2_pll_out_sels), 0, 0, 0, base + 0x54, 0);
> >  
> > -- 
> > 2.16.4
> >