ASoC: sh: fsi: add dev_pm_ops :: suspend/resume

Current FSI driver sets important settings when probing.
And it are not set again as long as driver is not bind again.
This mean FSI driver will lost it from register
if suspend/resume are happen.
This patch save important settings for suspend/resume.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Simon Horman <simon@horms.net>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/sh/fsi.c

@@ -153,6 +153,13 @@ struct fsi_priv {
 	int clk_master:1;
 
 	long rate;
+
+	/* for suspend/resume */
+	u32 saved_do_fmt;
+	u32 saved_di_fmt;
+	u32 saved_ckg1;
+	u32 saved_ckg2;
+	u32 saved_out_sel;
 };
 
 struct fsi_core {
@@ -173,6 +180,13 @@ struct fsi_master {
 	struct fsi_core *core;
 	struct sh_fsi_platform_info *info;
 	spinlock_t lock;
+
+	/* for suspend/resume */
+	u32 saved_a_mclk;
+	u32 saved_b_mclk;
+	u32 saved_iemsk;
+	u32 saved_imsk;
+	u32 saved_clk_rst;
 };
 
 /*
@@ -1277,6 +1291,76 @@ static int fsi_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void __fsi_suspend(struct fsi_priv *fsi,
+			  struct device *dev,
+			  set_rate_func set_rate)
+{
+	fsi->saved_do_fmt	= fsi_reg_read(fsi, DO_FMT);
+	fsi->saved_di_fmt	= fsi_reg_read(fsi, DI_FMT);
+	fsi->saved_ckg1		= fsi_reg_read(fsi, CKG1);
+	fsi->saved_ckg2		= fsi_reg_read(fsi, CKG2);
+	fsi->saved_out_sel	= fsi_reg_read(fsi, OUT_SEL);
+
+	if (fsi_is_clk_master(fsi))
+		set_rate(dev, fsi_is_port_a(fsi), fsi->rate, 0);
+}
+
+static void __fsi_resume(struct fsi_priv *fsi,
+			 struct device *dev,
+			 set_rate_func set_rate)
+{
+	fsi_reg_write(fsi, DO_FMT,	fsi->saved_do_fmt);
+	fsi_reg_write(fsi, DI_FMT,	fsi->saved_di_fmt);
+	fsi_reg_write(fsi, CKG1,	fsi->saved_ckg1);
+	fsi_reg_write(fsi, CKG2,	fsi->saved_ckg2);
+	fsi_reg_write(fsi, OUT_SEL,	fsi->saved_out_sel);
+
+	if (fsi_is_clk_master(fsi))
+		set_rate(dev, fsi_is_port_a(fsi), fsi->rate, 1);
+}
+
+static int fsi_suspend(struct device *dev)
+{
+	struct fsi_master *master = dev_get_drvdata(dev);
+	set_rate_func set_rate = fsi_get_info_set_rate(master);
+
+	pm_runtime_get_sync(dev);
+
+	__fsi_suspend(&master->fsia, dev, set_rate);
+	__fsi_suspend(&master->fsib, dev, set_rate);
+
+	master->saved_a_mclk	= fsi_core_read(master, a_mclk);
+	master->saved_b_mclk	= fsi_core_read(master, b_mclk);
+	master->saved_iemsk	= fsi_core_read(master, iemsk);
+	master->saved_imsk	= fsi_core_read(master, imsk);
+	master->saved_clk_rst	= fsi_master_read(master, CLK_RST);
+
+	pm_runtime_put_sync(dev);
+
+	return 0;
+}
+
+static int fsi_resume(struct device *dev)
+{
+	struct fsi_master *master = dev_get_drvdata(dev);
+	set_rate_func set_rate = fsi_get_info_set_rate(master);
+
+	pm_runtime_get_sync(dev);
+
+	__fsi_resume(&master->fsia, dev, set_rate);
+	__fsi_resume(&master->fsib, dev, set_rate);
+
+	fsi_core_mask_set(master, a_mclk, 0xffff, master->saved_a_mclk);
+	fsi_core_mask_set(master, b_mclk, 0xffff, master->saved_b_mclk);
+	fsi_core_mask_set(master, iemsk, 0xffff, master->saved_iemsk);
+	fsi_core_mask_set(master, imsk, 0xffff, master->saved_imsk);
+	fsi_master_mask_set(master, CLK_RST, 0xffff, master->saved_clk_rst);
+
+	pm_runtime_put_sync(dev);
+
+	return 0;
+}
+
 static int fsi_runtime_nop(struct device *dev)
 {
 	/* Runtime PM callback shared between ->runtime_suspend()
@@ -1290,6 +1374,8 @@ static int fsi_runtime_nop(struct device *dev)
 }
 
 static struct dev_pm_ops fsi_pm_ops = {
+	.suspend		= fsi_suspend,
+	.resume			= fsi_resume,
 	.runtime_suspend	= fsi_runtime_nop,
 	.runtime_resume		= fsi_runtime_nop,
 };