[v2,2/4] clk: imx: lpcg-scu: Skip HDMI LPCG clock save/restore

Commit Message

Peng Fan (OSS) Oct. 18, 2024, 10 a.m. UTC

From: Peng Fan <[e-mail]>

On i.MX8QM, HDMI LPCG clocks operation needs SCU clock "hdmi_ipg_clk"
to be ON. While during noirq suspend phase, "hdmi_ipg_clk" is disabled
by HDMI IRQ STEER driver, so SError will be triggered when accessing
the HDMI LPCG registers.

Skip all HDMI LPCG clocks save/restore to avoid SError during
system suspend/resume, it will NOT introduce additional power consumption
as their parent clock is disabled when suspend.

Signed-off-by: Peng Fan <[e-mail]>
---
 drivers/clk/imx/clk-lpcg-scu.c | 6 ++++++
 1 file changed, 6 insertions(+)

Patch

diff --git a/drivers/clk/imx/clk-lpcg-scu.c b/drivers/clk/imx/clk-lpcg-scu.c
index cd42190233662c66f2c354f0a2eee3a2531eeb3a..07deadcf73e929841fe113c7febfb6c9b6c5e719 100644
--- a/drivers/clk/imx/clk-lpcg-scu.c
+++ b/drivers/clk/imx/clk-lpcg-scu.c
@@ -163,6 +163,9 @@  static int __maybe_unused imx_clk_lpcg_scu_suspend(struct device *dev)
 {
 	struct clk_lpcg_scu *clk = dev_get_drvdata(dev);
 
+	if (!strncmp("hdmi_lpcg", clk_hw_get_name(&clk->hw), strlen("hdmi_lpcg")))
+		return 0;
+
 	clk->state = readl_relaxed(clk->reg);
 	dev_dbg(dev, "save lpcg state 0x%x\n", clk->state);
 
@@ -173,6 +176,9 @@  static int __maybe_unused imx_clk_lpcg_scu_resume(struct device *dev)
 {
 	struct clk_lpcg_scu *clk = dev_get_drvdata(dev);
 
+	if (!strncmp("hdmi_lpcg", clk_hw_get_name(&clk->hw), strlen("hdmi_lpcg")))
+		return 0;
+
 	/*
 	 * FIXME: Sometimes writes don't work unless the CPU issues
 	 * them twice