diff mbox series

[5/6] clk: imx: keep hsio bus clock always on

Message ID 20221027101159.942843-6-peng.fan@oss.nxp.com
State New
Headers
Series clk: imx93: fix and update |

Commit Message

Peng Fan (OSS) Oct. 27, 2022, 10:11 a.m. UTC 
  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>
---
 drivers/clk/imx/clk-imx93.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Stephen Boyd Oct. 27, 2022, 11:09 p.m. UTC | #1 
Quoting Peng Fan (OSS) (2022-10-27 03:11:58)
> 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>
> ---
>  drivers/clk/imx/clk-imx93.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/imx/clk-imx93.c b/drivers/clk/imx/clk-imx93.c
> index 422ad3c89845..74e8d810db7f 100644
> --- a/drivers/clk/imx/clk-imx93.c
> +++ b/drivers/clk/imx/clk-imx93.c
> @@ -109,7 +109,7 @@ 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, },
> +       { IMX93_CLK_HSIO,               "hsio_root",            0x1e80, LOW_SPEED_IO_SEL, CLK_IS_CRITICAL},

Similarly add a comment for critical flag please.
diff mbox series

Patch

diff --git a/drivers/clk/imx/clk-imx93.c b/drivers/clk/imx/clk-imx93.c
index 422ad3c89845..74e8d810db7f 100644
--- a/drivers/clk/imx/clk-imx93.c
+++ b/drivers/clk/imx/clk-imx93.c
@@ -109,7 +109,7 @@  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, },
+	{ 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, },