linux-kernel - [PATCH 5/6] clk: imx: keep hsio bus clock always on

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Date:   Fri, 28 Oct 2022 17:52:10 +0800
From:   "Peng Fan (OSS)" <peng.fan@....nxp.com>
To:     abelvesa@...nel.org, abel.vesa@...aro.org, mturquette@...libre.com,
        sboyd@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     linux-imx@....com, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Jacky Bai <ping.bai@....com>,
        Peng Fan <peng.fan@....com>
Subject: [PATCH 5/6] clk: imx: keep hsio bus clock always on

From: Jacky Bai <ping.bai@....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@....com>
Signed-off-by: Jacky Bai <ping.bai@....com>
 [Peng Fan] rewrite commit message
Signed-off-by: Peng Fan <peng.fan@....com>
---
 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