Commit c9dcb4c1 authored by Jacky Bai's avatar Jacky Bai Committed by Abel Vesa
Browse files

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: default avatarJacky Bai <ping.bai@nxp.com>
Signed-off-by: default avatarPeng Fan <peng.fan@nxp.com>
Reviewed-by: default avatarAbel Vesa <abel.vesa@linaro.org>
Signed-off-by: default avatarAbel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20221028095211.2598312-6-peng.fan@oss.nxp.com
parent 4ec9a8b9

drivers/clk/imx/clk-imx93.c

+5 −1
Original line number Diff line number Diff line
@@ -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, },