ASoC: Intel: Skylake: Disable SRAM Retention before D3

SW needs to set the PGCTL.LSRMD = 1 to disable LPSRAM retention
feature,otherwise it may lead to SRAM ECC Errors.

Signed-off-by: Dharageswari R <dharageswari.r@intel.com>
Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/intel/skylake/skl.c b/sound/soc/intel/skylake/skl.c
index 55c301b..cb3eb41 100644 (file)
--- a/sound/soc/intel/skylake/skl.c
+++ b/sound/soc/intel/skylake/skl.c
@@ -186,6 +186,7 @@ static int _skl_suspend(struct hdac_ext_bus *ebus)
 {
        struct skl *skl = ebus_to_skl(ebus);
        struct hdac_bus *bus = ebus_to_hbus(ebus);
+       struct pci_dev *pci = to_pci_dev(bus->dev);
        int ret;
 
        snd_hdac_ext_bus_link_power_down_all(ebus);
@@ -195,6 +196,8 @@ static int _skl_suspend(struct hdac_ext_bus *ebus)
                return ret;
 
        snd_hdac_bus_stop_chip(bus);
+       update_pci_dword(pci, AZX_PCIREG_PGCTL,
+               AZX_PGCTL_LSRMD_MASK, AZX_PGCTL_LSRMD_MASK);
        skl_enable_miscbdcge(bus->dev, false);
        snd_hdac_bus_enter_link_reset(bus);
        skl_enable_miscbdcge(bus->dev, true);

diff --git a/sound/soc/intel/skylake/skl.h b/sound/soc/intel/skylake/skl.h
index f66be17..25b8d48 100644 (file)
--- a/sound/soc/intel/skylake/skl.h
+++ b/sound/soc/intel/skylake/skl.h
@@ -48,6 +48,8 @@
 #define AZX_REG_VS_SDXEFIFOS_XBASE     0x1094
 #define AZX_REG_VS_SDXEFIFOS_XINTERVAL 0x20
 
+#define AZX_PCIREG_PGCTL               0x44
+#define AZX_PGCTL_LSRMD_MASK           (1 << 4)
 #define AZX_PCIREG_CGCTL               0x48
 #define AZX_CGCTL_MISCBDCGE_MASK       (1 << 6)