linux-kernel - Re: [PATCH 1/2] clk: imx7d: fix USDHC NAND clock

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Message-ID: <20170401030022.GA24882@b29396-OptiPlex-7040>
Date:   Sat, 1 Apr 2017 11:00:22 +0800
From:   Dong Aisheng <dongas86@...il.com>
To:     Stefan Agner <stefan@...er.ch>
Cc:     shawnguo@...nel.org, kernel@...gutronix.de, sboyd@...eaurora.org,
        aisheng.dong@....com, fabio.estevam@....com, robh+dt@...nel.org,
        mark.rutland@....com, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] clk: imx7d: fix USDHC NAND clock

On Wed, Mar 29, 2017 at 05:50:28PM -0700, Stefan Agner wrote:
> The USDHC NAND root clock is not gated by any CCM clock gate. Remove
> the bogus gate definition.
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
> The IMX7D_NAND_USDHC_BUS_ROOT_CLK clock is also in clks_init_on.
> In a quick test I removed IMX7D_NAND_USDHC_BUS_ROOT_CLK from
> clks_init_on, and the system including SD-cards seemed to work
> fine... So I guess we could remove the clock from clks_init_on
> after the two both changes got applied, any thoughts?
> 

Yes, it can be removed after apply.

> The gate 0x4130 was actually the DRAM gate, hence disabling that
> clock lead to disabling this gate, and hence a crash before this
> fixes... Maybe that was the reason it landed in clks_init_on...?
> 

Probably a history reason or mistake. :-)

Acked-by: Dong Aisheng <aisheng.dong@....com>

Regards
Dong Aisheng

> --
> Stefan
> 
>  drivers/clk/imx/clk-imx7d.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/imx/clk-imx7d.c b/drivers/clk/imx/clk-imx7d.c
> index ae1d31be906e..4466acaacb71 100644
> --- a/drivers/clk/imx/clk-imx7d.c
> +++ b/drivers/clk/imx/clk-imx7d.c
> @@ -724,7 +724,7 @@ static void __init imx7d_clocks_init(struct device_node *ccm_node)
>  	clks[IMX7D_MAIN_AXI_ROOT_DIV] = imx_clk_divider2("axi_post_div", "axi_pre_div", base + 0x8800, 0, 6);
>  	clks[IMX7D_DISP_AXI_ROOT_DIV] = imx_clk_divider2("disp_axi_post_div", "disp_axi_pre_div", base + 0x8880, 0, 6);
>  	clks[IMX7D_ENET_AXI_ROOT_DIV] = imx_clk_divider2("enet_axi_post_div", "enet_axi_pre_div", base + 0x8900, 0, 6);
> -	clks[IMX7D_NAND_USDHC_BUS_ROOT_DIV] = imx_clk_divider2("nand_usdhc_post_div", "nand_usdhc_pre_div", base + 0x8980, 0, 6);
> +	clks[IMX7D_NAND_USDHC_BUS_ROOT_CLK] = imx_clk_divider2("nand_usdhc_root_clk", "nand_usdhc_pre_div", base + 0x8980, 0, 6);
>  	clks[IMX7D_AHB_CHANNEL_ROOT_DIV] = imx_clk_divider2("ahb_post_div", "ahb_pre_div", base + 0x9000, 0, 6);
>  	clks[IMX7D_DRAM_ROOT_DIV] = imx_clk_divider2("dram_post_div", "dram_cg", base + 0x9880, 0, 3);
>  	clks[IMX7D_DRAM_PHYM_ALT_ROOT_DIV] = imx_clk_divider2("dram_phym_alt_post_div", "dram_phym_alt_pre_div", base + 0xa000, 0, 3);
> @@ -797,7 +797,6 @@ static void __init imx7d_clocks_init(struct device_node *ccm_node)
>  	clks[IMX7D_ENET_AXI_ROOT_CLK] = imx_clk_gate4("enet_axi_root_clk", "enet_axi_post_div", base + 0x4060, 0);
>  	clks[IMX7D_OCRAM_CLK] = imx_clk_gate4("ocram_clk", "axi_post_div", base + 0x4110, 0);
>  	clks[IMX7D_OCRAM_S_CLK] = imx_clk_gate4("ocram_s_clk", "ahb_post_div", base + 0x4120, 0);
> -	clks[IMX7D_NAND_USDHC_BUS_ROOT_CLK] = imx_clk_gate4("nand_usdhc_root_clk", "nand_usdhc_post_div", base + 0x4130, 0);
>  	clks[IMX7D_AHB_CHANNEL_ROOT_CLK] = imx_clk_gate4("ahb_root_clk", "ahb_post_div", base + 0x4200, 0);
>  	clks[IMX7D_DRAM_ROOT_CLK] = imx_clk_gate4("dram_root_clk", "dram_post_div", base + 0x4130, 0);
>  	clks[IMX7D_DRAM_PHYM_ROOT_CLK] = imx_clk_gate4("dram_phym_root_clk", "dram_phym_cg", base + 0x4130, 0);
> -- 
> 2.12.1
>