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clk: imx: keep hsio bus clock always on 

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.

Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20221028095211.2598312-6-peng.fan@oss.nxp.com
This commit is contained in:
Jacky Bai 2022-10-28 17:52:10 +08:00 committed by Abel Vesa
parent 4ec9a8b9b0
commit c9dcb4c1b6
1 changed files with 5 additions and 1 deletions
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6
drivers/clk/imx/clk-imx93.c
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@ -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, },