On 22-10-28 17:52:10, Peng Fan (OSS) wrote:
> From: Jacky Bai <ping.bai@nxp.com>
>
> During Linux System suspend/resume stress test after System Sleep
> enabled, system will stuck sometimes. It is because NICMIX is powered
> down, which HSIOMIX(always on) is not powered down. When NICMIX
> powering down, HSIOMIX will get a hardware handshake, without HSIO ROOT clk,
> the handshake will lose. Then after NICMIX power on when system resume,
> the access to HSIOMIX through NICMIX would be broken. So keep HSIO ROOT
> always on.
>
> Reviewed-by: Peng Fan <peng.fan@nxp.com>
> Signed-off-by: Jacky Bai <ping.bai@nxp.com>
> [Peng Fan] rewrite commit message
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
> ---
> drivers/clk/imx/clk-imx93.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/imx/clk-imx93.c b/drivers/clk/imx/clk-imx93.c
> index 422ad3c89845..7dace96f36df 100644
> --- a/drivers/clk/imx/clk-imx93.c
> +++ b/drivers/clk/imx/clk-imx93.c
> @@ -109,7 +109,11 @@ static const struct imx93_clk_root {
> { IMX93_CLK_CCM_CKO2, "ccm_cko2_root", 0x1d00, CKO2_SEL, },
> { IMX93_CLK_CCM_CKO3, "ccm_cko3_root", 0x1d80, CKO1_SEL, },
> { IMX93_CLK_CCM_CKO4, "ccm_cko4_root", 0x1e00, CKO2_SEL, },
> - { IMX93_CLK_HSIO, "hsio_root", 0x1e80, LOW_SPEED_IO_SEL, },
> + /*
> + * Critical because clk is used for handshake between HSIOMIX and NICMIX when
> + * NICMIX power down/on during system suspend/resume
> + */
> + { IMX93_CLK_HSIO, "hsio_root", 0x1e80, LOW_SPEED_IO_SEL, CLK_IS_CRITICAL},
> { IMX93_CLK_HSIO_USB_TEST_60M, "hsio_usb_test_60m_root", 0x1f00, LOW_SPEED_IO_SEL, },
> { IMX93_CLK_HSIO_ACSCAN_80M, "hsio_acscan_80m_root", 0x1f80, LOW_SPEED_IO_SEL, },
> { IMX93_CLK_HSIO_ACSCAN_480M, "hsio_acscan_480m_root", 0x2000, MISC_SEL, },
> --
> 2.37.1
>