Save and reconfigure the MERAM registers when the MERAM is powered down
and restored
Signed-off-by: Damian Hobson-Garcia <dhobsong@xxxxxxxxxx>
---
Changes from V2
===============
* The private data structure definition was moved from sh_mobile_meram.h to
sh_mobile_meram.c. This has been moved into a separate patch
drivers/video/sh_mobile_meram.c | 71 +++++++++++++++++++++++++++++++++++++++
1 files changed, 71 insertions(+), 0 deletions(-)
diff --git a/drivers/video/sh_mobile_meram.c b/drivers/video/sh_mobile_meram.c
index cc71cbf..7afd77a 100644
--- a/drivers/video/sh_mobile_meram.c
+++ b/drivers/video/sh_mobile_meram.c
@@ -37,12 +37,31 @@
#define MEQSEL1 0x40
#define MEQSEL2 0x44
+static unsigned long common_regs[] = {
+ MEVCR1,
+ MEQSEL1,
+ MEQSEL2,
+};
+#define CMN_REGS_SIZE ARRAY_SIZE(common_regs)
+
+static unsigned long icb_regs[] = {
+ MExxCTL,
+ MExxBSIZE,
+ MExxMNCF,
+ MExxSARA,
+ MExxSARB,
+ MExxSBSIZE,
+};
+#define ICB_REGS_SIZE ARRAY_SIZE(icb_regs)
+
struct sh_mobile_meram_priv {
void __iomem *base;
struct mutex lock;
unsigned long used_icb;
int used_meram_cache_regions;
unsigned long used_meram_cache[SH_MOBILE_MERAM_ICB_NUM];
+ unsigned long cmn_saved_regs[CMN_REGS_SIZE];
+ unsigned long icb_saved_regs[ICB_REGS_SIZE * SH_MOBILE_MERAM_ICB_NUM];
};
/* settings */
@@ -489,6 +508,57 @@ int sh_mobile_meram_pm_put_sync(struct sh_mobile_meram_info *pdata)
return 0;
}
+static int sh_mobile_meram_runtime_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
+ int k, j;
+
+ for (k = 0; k < CMN_REGS_SIZE; k++)
+ priv->cmn_saved_regs[k] = meram_read_reg(priv->base,
+ common_regs[k]);
+
+ for (j = 0; j < 32; j++) {
+ if (!test_bit(j, &priv->used_icb))
+ continue;
+ for (k = 0; k < ICB_REGS_SIZE; k++) {
+ priv->icb_saved_regs[j * ICB_REGS_SIZE + k] =
+ meram_read_icb(priv->base, j, icb_regs[k]);
+ /* Reset ICB on resume */
+ if (icb_regs[k] == MExxCTL)
+ priv->icb_saved_regs[j * ICB_REGS_SIZE + k] =
+ 0x70;
+ }
+ }
+ return 0;
+}
+
+static int sh_mobile_meram_runtime_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
+ int k, j;
+
+ for (j = 0; j < 32; j++) {
+ if (!test_bit(j, &priv->used_icb))
+ continue;
+ for (k = 0; k < ICB_REGS_SIZE; k++) {
+ meram_write_icb(priv->base, j, icb_regs[k],
+ priv->icb_saved_regs[j * ICB_REGS_SIZE + k]);
+ }
+ }
+
+ for (k = 0; k < CMN_REGS_SIZE; k++)
+ meram_write_reg(priv->base, common_regs[k],
+ priv->cmn_saved_regs[k]);
+ return 0;
+}
+
+static const struct dev_pm_ops sh_mobile_meram_dev_pm_ops = {
+ .runtime_suspend = sh_mobile_meram_runtime_suspend,
+ .runtime_resume = sh_mobile_meram_runtime_resume,
+};
+
static struct sh_mobile_meram_ops sh_mobile_meram_ops = {
.module = THIS_MODULE,
.meram_register = sh_mobile_meram_register,
@@ -579,6 +649,7 @@ static struct platform_driver sh_mobile_meram_driver = {
.driver = {
.name = "sh_mobile_meram",
.owner = THIS_MODULE,
+ .pm = &sh_mobile_meram_dev_pm_ops,
},
.probe = sh_mobile_meram_probe,
.remove = sh_mobile_meram_remove,
--
1.7.1
--
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