Re: [PATCH v4 2/3] clk: imx: imx8mp: add shared clk gate for usb suspend clk

[Abel Vesa <abel.vesa@linaro.org>]

On 22-09-30 22:54:22, Li Jun wrote:
> 32K usb suspend clock gate is shared with usb_root_clk, this
> shared clock gate was initially defined only for usb suspend
> clock, usb suspend clk is kept on while system is active or
> system sleep with usb wakeup enabled, so usb root clock is
> fine with this situation; with the commit cf7f3f4fa9e5
> ("clk: imx8mp: fix usb_root_clk parent"), this clock gate is
> changed to be for usb root clock, but usb root clock will
> be off while usb is suspended, so usb suspend clock will be
> gated too, this cause some usb functionalities will not work,
> so define this clock to be a shared clock gate to conform with
> the real HW status.
> 
> Fixes: 9c140d9926761 ("clk: imx: Add support for i.MX8MP clock driver")
> Cc: stable@vger.kernel.org # v5.19+
> Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Signed-off-by: Li Jun <jun.li@nxp.com>

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

> ---
> change for v4:
> - improve the commit log to explain why this is stable stuff.
>  
>  drivers/clk/imx/clk-imx8mp.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/imx/clk-imx8mp.c b/drivers/clk/imx/clk-imx8mp.c
> index e89db568f5a8..5b66514bdd0c 100644
> --- a/drivers/clk/imx/clk-imx8mp.c
> +++ b/drivers/clk/imx/clk-imx8mp.c
> @@ -17,6 +17,7 @@
>  
>  static u32 share_count_nand;
>  static u32 share_count_media;
> +static u32 share_count_usb;
>  
>  static const char * const pll_ref_sels[] = { "osc_24m", "dummy", "dummy", "dummy", };
>  static const char * const audio_pll1_bypass_sels[] = {"audio_pll1", "audio_pll1_ref_sel", };
> @@ -673,7 +674,8 @@ static int imx8mp_clocks_probe(struct platform_device *pdev)
>  	hws[IMX8MP_CLK_UART2_ROOT] = imx_clk_hw_gate4("uart2_root_clk", "uart2", ccm_base + 0x44a0, 0);
>  	hws[IMX8MP_CLK_UART3_ROOT] = imx_clk_hw_gate4("uart3_root_clk", "uart3", ccm_base + 0x44b0, 0);
>  	hws[IMX8MP_CLK_UART4_ROOT] = imx_clk_hw_gate4("uart4_root_clk", "uart4", ccm_base + 0x44c0, 0);
> -	hws[IMX8MP_CLK_USB_ROOT] = imx_clk_hw_gate4("usb_root_clk", "hsio_axi", ccm_base + 0x44d0, 0);
> +	hws[IMX8MP_CLK_USB_ROOT] = imx_clk_hw_gate2_shared2("usb_root_clk", "hsio_axi", ccm_base + 0x44d0, 0, &share_count_usb);
> +	hws[IMX8MP_CLK_USB_SUSP] = imx_clk_hw_gate2_shared2("usb_suspend_clk", "osc_32k", ccm_base + 0x44d0, 0, &share_count_usb);
>  	hws[IMX8MP_CLK_USB_PHY_ROOT] = imx_clk_hw_gate4("usb_phy_root_clk", "usb_phy_ref", ccm_base + 0x44f0, 0);
>  	hws[IMX8MP_CLK_USDHC1_ROOT] = imx_clk_hw_gate4("usdhc1_root_clk", "usdhc1", ccm_base + 0x4510, 0);
>  	hws[IMX8MP_CLK_USDHC2_ROOT] = imx_clk_hw_gate4("usdhc2_root_clk", "usdhc2", ccm_base + 0x4520, 0);
> -- 
> 2.34.1
>