media: mtk-vpu: on suspend, read/write regs only if vpu is running

If the vpu is not running, we should not rely on VPU_IDLE_REG
value. In this case, the suspend cb should only unprepare the
clock. This fixes a system-wide suspend to ram failure:

[  273.073363] PM: suspend entry (deep)
[  273.410502] mtk-msdc 11230000.mmc: phase: [map:ffffffff] [maxlen:32] [final:10]
[  273.455926] Filesystems sync: 0.378 seconds
[  273.589707] Freezing user space processes ... (elapsed 0.003 seconds) done.
[  273.600104] OOM killer disabled.
[  273.603409] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
[  273.613361] mwifiex_sdio mmc2:0001:1: None of the WOWLAN triggers enabled
[  274.784952] mtk_vpu 10020000.vpu: vpu idle timeout
[  274.789764] PM: dpm_run_callback(): platform_pm_suspend+0x0/0x70 returns -5
[  274.796740] mtk_vpu 10020000.vpu: PM: failed to suspend: error -5
[  274.802842] PM: Some devices failed to suspend, or early wake event detected
[  275.426489] OOM killer enabled.
[  275.429718] Restarting tasks ...
[  275.435765] done.
[  275.447510] PM: suspend exit

Fixes: 1f565e26 ("media: mtk-vpu: VPU should be in idle state before system is suspended")
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/mtk-vpu/mtk_vpu.c

@@ -985,6 +985,12 @@ static int mtk_vpu_suspend(struct device *dev)
 		return ret;
 	}
 
+	if (!vpu_running(vpu)) {
+		vpu_clock_disable(vpu);
+		clk_unprepare(vpu->clk);
+		return 0;
+	}
+
 	mutex_lock(&vpu->vpu_mutex);
 	/* disable vpu timer interrupt */
 	vpu_cfg_writel(vpu, vpu_cfg_readl(vpu, VPU_INT_STATUS) | VPU_IDLE_STATE,