From: Peng Fan Date: Sun, 27 Oct 2024 12:00:11 +0000 (+0800) Subject: clk: imx: lpcg-scu: Skip HDMI LPCG clock save/restore X-Git-Tag: v6.13-rc1~110^2~1^4^2~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=92888f39193419c117e282cce7fd762ba78784a4;p=thirdparty%2Fkernel%2Flinux.git clk: imx: lpcg-scu: Skip HDMI LPCG clock save/restore 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 Link: https://lore.kernel.org/r/20241027-imx-clk-v1-v3-5-89152574d1d7@nxp.com Signed-off-by: Abel Vesa --- diff --git a/drivers/clk/imx/clk-lpcg-scu.c b/drivers/clk/imx/clk-lpcg-scu.c index 620afdf8dc03e..6376557a3c3d0 100644 --- a/drivers/clk/imx/clk-lpcg-scu.c +++ b/drivers/clk/imx/clk-lpcg-scu.c @@ -161,6 +161,9 @@ 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); @@ -171,6 +174,9 @@ 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; + writel(clk->state, clk->reg); lpcg_e10858_writel(0, clk->reg, clk->state); dev_dbg(dev, "restore lpcg state 0x%x\n", clk->state);