ALSA - hda: Add support for parsing new HDA capabilities

Skylake onwards HDA controller supports new capabilities like
Global Time Stamping (GTS) capability. So add support to parse
these new capabilities.

Signed-off-by: Guneshwor Singh <guneshwor.o.singh@intel.com>
Signed-off-by: Hardik T Shah <hardik.t.shah@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

4 files changed, 61 insertions, 0 deletions

diff --git a/include/sound/hda_register.h b/include/sound/hda_register.h
index ff1aecf325e8..0013063db7f2 100644
--- a/include/sound/hda_register.h
+++ b/include/sound/hda_register.h
@@ -89,6 +89,19 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
 #define AZX_REG_SD_BDLPL                0x18
 #define AZX_REG_SD_BDLPU                0x1c
 
+/* GTS registers */
+#define AZX_REG_LLCH                    0x14
+
+#define AZX_REG_GTS_BASE                0x520
+
+#define AZX_REG_GTSCC   (AZX_REG_GTS_BASE + 0x00)
+#define AZX_REG_WALFCC  (AZX_REG_GTS_BASE + 0x04)
+#define AZX_REG_TSCCL   (AZX_REG_GTS_BASE + 0x08)
+#define AZX_REG_TSCCU   (AZX_REG_GTS_BASE + 0x0C)
+#define AZX_REG_LLPFOC  (AZX_REG_GTS_BASE + 0x14)
+#define AZX_REG_LLPCL   (AZX_REG_GTS_BASE + 0x18)
+#define AZX_REG_LLPCU   (AZX_REG_GTS_BASE + 0x1C)
+
 /* Haswell/Broadwell display HD-A controller Extended Mode registers */
 #define AZX_REG_HSW_EM4                 0x100c
 #define AZX_REG_HSW_EM5                 0x1010
@@ -242,6 +255,29 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
 /* Interval used to calculate the iterating register offset */
 #define AZX_DRSM_INTERVAL               0x08
 
+/* Global time synchronization registers */
+#define GTSCC_TSCCD_MASK                0x80000000
+#define GTSCC_TSCCD_SHIFT               BIT(31)
+#define GTSCC_TSCCI_MASK                0x20
+#define GTSCC_CDMAS_DMA_DIR_SHIFT       4
+
+#define WALFCC_CIF_MASK                 0x1FF
+#define WALFCC_FN_SHIFT                 9
+#define HDA_CLK_CYCLES_PER_FRAME        512
+
+/*
+ * An error occurs near frame "rollover". The clocks in frame value indicates
+ * whether this error may have occurred. Here we use the value of 10. Please
+ * see the errata for the right number [<10]
+ */
+#define HDA_MAX_CYCLE_VALUE             499
+#define HDA_MAX_CYCLE_OFFSET            10
+#define HDA_MAX_CYCLE_READ_RETRY        10
+
+#define TSCCU_CCU_SHIFT                 32
+#define LLPC_CCU_SHIFT                  32
+
+
 /*
  * helpers to read the stream position
  */
diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c
index 27de8015717d..1567fe209e01 100644
--- a/sound/pci/hda/hda_controller.c
+++ b/sound/pci/hda/hda_controller.c
@@ -412,6 +412,11 @@ static int azx_pcm_open(struct snd_pcm_substream *substream)
                 goto unlock;
         }
         runtime->private_data = azx_dev;
+
+        if (chip->gts_present)
+                azx_pcm_hw.info = azx_pcm_hw.info |
+                        SNDRV_PCM_INFO_HAS_LINK_SYNCHRONIZED_ATIME;
+
         runtime->hw = azx_pcm_hw;
         runtime->hw.channels_min = hinfo->channels_min;
         runtime->hw.channels_max = hinfo->channels_max;
diff --git a/sound/pci/hda/hda_controller.h b/sound/pci/hda/hda_controller.h
index ec63bbf1ec6d..a50e0532622a 100644
--- a/sound/pci/hda/hda_controller.h
+++ b/sound/pci/hda/hda_controller.h
@@ -159,6 +159,9 @@ struct azx {
         unsigned int region_requested:1;
         unsigned int disabled:1; /* disabled by vga_switcheroo */
 
+        /* GTS present */
+        unsigned int gts_present:1;
+
 #ifdef CONFIG_SND_HDA_DSP_LOADER
         struct azx_dev saved_azx_dev;
 #endif
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 89dacf9b4e6c..4786f435eb64 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -54,6 +54,7 @@
 /* for snoop control */
 #include <asm/pgtable.h>
 #include <asm/cacheflush.h>
+#include <asm/cpufeature.h>
 #endif
 #include <sound/core.h>
 #include <sound/initval.h>
@@ -1655,6 +1656,22 @@ static int azx_first_init(struct azx *chip)
                 return -ENXIO;
         }
 
+        if (IS_SKL_PLUS(pci))
+                snd_hdac_bus_parse_capabilities(bus);
+
+        /*
+         * Some Intel CPUs has always running timer (ART) feature and
+         * controller may have Global time sync reporting capability, so
+         * check both of these before declaring synchronized time reporting
+         * capability SNDRV_PCM_INFO_HAS_LINK_SYNCHRONIZED_ATIME
+         */
+        chip->gts_present = false;
+
+#ifdef CONFIG_X86
+        if (bus->ppcap && boot_cpu_has(X86_FEATURE_ART))
+                chip->gts_present = true;
+#endif
+
         if (chip->msi) {
                 if (chip->driver_caps & AZX_DCAPS_NO_MSI64) {
                         dev_dbg(card->dev, "Disabling 64bit MSI\n");