redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

clk: imx: 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.

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

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
5.4-rM2-2.2.x-imx-squashed
Anson Huang 2019-11-04 16:31:56 +08:00 committed by Dong Aisheng
parent 32caf053fc
commit bae5f64837
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/clk/imx/clk-lpcg-scu.c
View File

@ -125,6 +125,9 @@ 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);
@ -135,6 +138,9 @@ 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: double write in case a failure */
writel(clk->state, clk->reg);
writel(clk->state, clk->reg);