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authorAlexander Shishkin <alexander.shishkin@linux.intel.com>2017-02-24 17:09:40 +0300
committerAlexander Shishkin <alexander.shishkin@linux.intel.com>2017-08-25 18:48:00 +0300
commita0e7df335afd2a8a8a688251ffee375b58b6517c (patch)
tree6639e55ee5fb65286bde48fdbfa6f4ab16890077
parent29e15e83a99cdc13d0d38de558fbea641f8fdda8 (diff)
downloadlinux-a0e7df335afd2a8a8a688251ffee375b58b6517c.tar.xz
intel_th: Perform time resync on capture start
On some devices (TH 2.x devices at the moment), the internal time counter is initially not synchronized to the global crystal clock, so the time stamps it produces will not be useful. In this case, the driver needs to force the time counter resync. This applies the workaround to relevant devices. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
-rw-r--r--drivers/hwtracing/intel_th/core.c3
-rw-r--r--drivers/hwtracing/intel_th/gth.c23
-rw-r--r--drivers/hwtracing/intel_th/gth.h5
-rw-r--r--drivers/hwtracing/intel_th/intel_th.h4
-rw-r--r--drivers/hwtracing/intel_th/pci.c56
5 files changed, 82 insertions, 9 deletions
diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c
index 998e3e55073a..1a023e30488c 100644
--- a/drivers/hwtracing/intel_th/core.c
+++ b/drivers/hwtracing/intel_th/core.c
@@ -436,8 +436,9 @@ static const struct intel_th_subdevice {
.nres = 1,
.res = {
{
+ /* Handle TSCU from GTH driver */
.start = REG_GTH_OFFSET,
- .end = REG_GTH_OFFSET + REG_GTH_LENGTH - 1,
+ .end = REG_TSCU_OFFSET + REG_TSCU_LENGTH - 1,
.flags = IORESOURCE_MEM,
},
},
diff --git a/drivers/hwtracing/intel_th/gth.c b/drivers/hwtracing/intel_th/gth.c
index 7d9d667fe017..018678ec3c13 100644
--- a/drivers/hwtracing/intel_th/gth.c
+++ b/drivers/hwtracing/intel_th/gth.c
@@ -285,16 +285,16 @@ gth_output_parm_get(struct gth_device *gth, int port, unsigned int parm)
*/
static int intel_th_gth_reset(struct gth_device *gth)
{
- u32 scratchpad;
+ u32 reg;
int port, i;
- scratchpad = ioread32(gth->base + REG_GTH_SCRPD0);
- if (scratchpad & SCRPD_DEBUGGER_IN_USE)
+ reg = ioread32(gth->base + REG_GTH_SCRPD0);
+ if (reg & SCRPD_DEBUGGER_IN_USE)
return -EBUSY;
/* Always save/restore STH and TU registers in S0ix entry/exit */
- scratchpad |= SCRPD_STH_IS_ENABLED | SCRPD_TRIGGER_IS_ENABLED;
- iowrite32(scratchpad, gth->base + REG_GTH_SCRPD0);
+ reg |= SCRPD_STH_IS_ENABLED | SCRPD_TRIGGER_IS_ENABLED;
+ iowrite32(reg, gth->base + REG_GTH_SCRPD0);
/* output ports */
for (port = 0; port < 8; port++) {
@@ -512,6 +512,15 @@ static void intel_th_gth_disable(struct intel_th_device *thdev,
iowrite32(reg, gth->base + REG_GTH_SCRPD0);
}
+static void gth_tscu_resync(struct gth_device *gth)
+{
+ u32 reg;
+
+ reg = ioread32(gth->base + REG_TSCU_TSUCTRL);
+ reg &= ~TSUCTRL_CTCRESYNC;
+ iowrite32(reg, gth->base + REG_TSCU_TSUCTRL);
+}
+
/**
* intel_th_gth_enable() - enable tracing to an output device
* @thdev: GTH device
@@ -524,6 +533,7 @@ static void intel_th_gth_enable(struct intel_th_device *thdev,
struct intel_th_output *output)
{
struct gth_device *gth = dev_get_drvdata(&thdev->dev);
+ struct intel_th *th = to_intel_th(thdev);
u32 scr = 0xfc0000, scrpd;
int master;
@@ -539,6 +549,9 @@ static void intel_th_gth_enable(struct intel_th_device *thdev,
output->active = true;
spin_unlock(&gth->gth_lock);
+ if (INTEL_TH_CAP(th, tscu_enable))
+ gth_tscu_resync(gth);
+
scrpd = ioread32(gth->base + REG_GTH_SCRPD0);
scrpd |= output->scratchpad;
iowrite32(scrpd, gth->base + REG_GTH_SCRPD0);
diff --git a/drivers/hwtracing/intel_th/gth.h b/drivers/hwtracing/intel_th/gth.h
index 56f0d2620577..f3d234251a12 100644
--- a/drivers/hwtracing/intel_th/gth.h
+++ b/drivers/hwtracing/intel_th/gth.h
@@ -55,9 +55,14 @@ enum {
REG_GTH_SCRPD1 = 0xe4, /* ScratchPad[1] */
REG_GTH_SCRPD2 = 0xe8, /* ScratchPad[2] */
REG_GTH_SCRPD3 = 0xec, /* ScratchPad[3] */
+ REG_TSCU_TSUCTRL = 0x2000, /* TSCU control register */
+ REG_TSCU_TSCUSTAT = 0x2004, /* TSCU status register */
};
/* waiting for Pipeline Empty bit(s) to assert for GTH */
#define GTH_PLE_WAITLOOP_DEPTH 10000
+#define TSUCTRL_CTCRESYNC BIT(0)
+#define TSCUSTAT_CTCSYNCING BIT(1)
+
#endif /* __INTEL_TH_GTH_H__ */
diff --git a/drivers/hwtracing/intel_th/intel_th.h b/drivers/hwtracing/intel_th/intel_th.h
index 78a4fb28b135..99ad563fc40d 100644
--- a/drivers/hwtracing/intel_th/intel_th.h
+++ b/drivers/hwtracing/intel_th/intel_th.h
@@ -298,6 +298,10 @@ enum {
REG_GTH_OFFSET = 0x0000,
REG_GTH_LENGTH = 0x2000,
+ /* Timestamp counter unit (TSCU) */
+ REG_TSCU_OFFSET = 0x2000,
+ REG_TSCU_LENGTH = 0x1000,
+
/* Software Trace Hub (STH) [0x4000..0x4fff] */
REG_STH_OFFSET = 0x4000,
REG_STH_LENGTH = 0x2000,
diff --git a/drivers/hwtracing/intel_th/pci.c b/drivers/hwtracing/intel_th/pci.c
index aed6d594991e..bc9cebc30526 100644
--- a/drivers/hwtracing/intel_th/pci.c
+++ b/drivers/hwtracing/intel_th/pci.c
@@ -27,6 +27,49 @@
#define BAR_MASK (BIT(TH_MMIO_CONFIG) | BIT(TH_MMIO_SW))
+#define PCI_REG_NPKDSC 0x80
+#define NPKDSC_TSACT BIT(5)
+
+static int intel_th_pci_activate(struct intel_th *th)
+{
+ struct pci_dev *pdev = to_pci_dev(th->dev);
+ u32 npkdsc;
+ int err;
+
+ if (!INTEL_TH_CAP(th, tscu_enable))
+ return 0;
+
+ err = pci_read_config_dword(pdev, PCI_REG_NPKDSC, &npkdsc);
+ if (!err) {
+ npkdsc |= NPKDSC_TSACT;
+ err = pci_write_config_dword(pdev, PCI_REG_NPKDSC, npkdsc);
+ }
+
+ if (err)
+ dev_err(&pdev->dev, "failed to read NPKDSC register\n");
+
+ return err;
+}
+
+static void intel_th_pci_deactivate(struct intel_th *th)
+{
+ struct pci_dev *pdev = to_pci_dev(th->dev);
+ u32 npkdsc;
+ int err;
+
+ if (!INTEL_TH_CAP(th, tscu_enable))
+ return;
+
+ err = pci_read_config_dword(pdev, PCI_REG_NPKDSC, &npkdsc);
+ if (!err) {
+ npkdsc |= NPKDSC_TSACT;
+ err = pci_write_config_dword(pdev, PCI_REG_NPKDSC, npkdsc);
+ }
+
+ if (err)
+ dev_err(&pdev->dev, "failed to read NPKDSC register\n");
+}
+
static int intel_th_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
@@ -47,6 +90,9 @@ static int intel_th_pci_probe(struct pci_dev *pdev,
if (IS_ERR(th))
return PTR_ERR(th);
+ th->activate = intel_th_pci_activate;
+ th->deactivate = intel_th_pci_deactivate;
+
pci_set_master(pdev);
return 0;
@@ -59,6 +105,10 @@ static void intel_th_pci_remove(struct pci_dev *pdev)
intel_th_free(th);
}
+static const struct intel_th_drvdata intel_th_2x = {
+ .tscu_enable = 1,
+};
+
static const struct pci_device_id intel_th_pci_id_table[] = {
{
PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x9d26),
@@ -96,17 +146,17 @@ static const struct pci_device_id intel_th_pci_id_table[] = {
{
/* Gemini Lake */
PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x318e),
- .driver_data = (kernel_ulong_t)0,
+ .driver_data = (kernel_ulong_t)&intel_th_2x,
},
{
/* Cannon Lake H */
PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xa326),
- .driver_data = (kernel_ulong_t)0,
+ .driver_data = (kernel_ulong_t)&intel_th_2x,
},
{
/* Cannon Lake LP */
PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x9da6),
- .driver_data = (kernel_ulong_t)0,
+ .driver_data = (kernel_ulong_t)&intel_th_2x,
},
{ 0 },
};