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

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Date:   Mon, 28 Oct 2019 16:53:00 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Peng Fan <peng.fan@....com>
Cc:     "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>,
        Abel Vesa <abel.vesa@....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

@Abel, comments?

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
>