[PATCH v2 13/40] drm/i915/tgl: Access the right register when handling PSR interruptions

Lucas De Marchi
2019-08-17T09:39:35Z

From: José Roberto de Souza <jose.souza@intel.com>

For older gens PSR IIR and IMR had a fixed address that was not
relative to anything, but from TGL those registers moved to each
transcoder offset.

So here adding a new macro and a new PSR irq handler with the
transcoder parameter.

Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
drivers/gpu/drm/i915/display/intel_psr.c | 63 ++++++++++++++++++------
drivers/gpu/drm/i915/display/intel_psr.h | 1 +
drivers/gpu/drm/i915/i915_irq.c | 52 ++++++++++++++++---
drivers/gpu/drm/i915/i915_reg.h | 10 +++-
4 files changed, 105 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index e30f84e8c34a..bd8e6a8a7676 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -91,20 +91,33 @@ static bool intel_psr2_enabled(struct drm_i915_private *dev_priv,
static void intel_psr_irq_control(struct drm_i915_private *dev_priv)
{
enum transcoder trans = dev_priv->psr.transcoder;
- u32 val, mask;
+ u32 psr_error, psr_entry, psr_exit, mask, val;
+ i915_reg_t mask_reg;
+
+ if (INTEL_GEN(dev_priv) >= 12) {
+ psr_error = TRANS_PSR_ERROR;
+ psr_entry = TRANS_PSR_PRE_ENTRY;
+ psr_exit = TRANS_PSR_POST_EXIT;
+ mask_reg = TRANS_PSR_IMR(trans);
+ } else {
+ psr_error = EDP_PSR_ERROR(trans);
+ psr_entry = EDP_PSR_PRE_ENTRY(trans);
+ psr_exit = EDP_PSR_POST_EXIT(trans);
+ mask_reg = EDP_PSR_IMR;
+ }

- mask = EDP_PSR_ERROR(trans);
+ mask = psr_error;
if (dev_priv->psr.debug & I915_PSR_DEBUG_IRQ)
- mask |= EDP_PSR_POST_EXIT(trans) | EDP_PSR_PRE_ENTRY(trans);
+ mask |= psr_exit | psr_entry;

/*
* TODO: when handling multiple PSR instances a global spinlock will be
* needed to synchronize the value of shared register
*/
- val = I915_READ(EDP_PSR_IMR);
- val &= ~EDP_PSR_TRANS_MASK(trans);
+ val = I915_READ(mask_reg);
+ val &= ~(psr_error | psr_entry | psr_exit);
val |= ~mask;
- I915_WRITE(EDP_PSR_IMR, val);
+ I915_WRITE(mask_reg, val);
}

static void psr_event_print(u32 val, bool psr2_enabled)
@@ -147,9 +160,21 @@ static void psr_event_print(u32 val, bool psr2_enabled)
void intel_psr_irq_handler(struct drm_i915_private *dev_priv, u32 psr_iir)
{
enum transcoder cpu_transcoder = dev_priv->psr.transcoder;
+ u32 psr_error, psr_entry, psr_exit;
ktime_t time_ns = ktime_get();

- if (psr_iir & EDP_PSR_ERROR(cpu_transcoder)) {
+ if (INTEL_GEN(dev_priv) >= 12) {
+ psr_error = TRANS_PSR_ERROR;
+ psr_entry = TRANS_PSR_PRE_ENTRY;
+ psr_exit = TRANS_PSR_POST_EXIT;
+ } else {
+ psr_error = EDP_PSR_ERROR(cpu_transcoder);
+ psr_entry = EDP_PSR_PRE_ENTRY(cpu_transcoder);
+ psr_exit = EDP_PSR_POST_EXIT(cpu_transcoder);
+ }
+
+ if (psr_iir & psr_error) {
+ i915_reg_t mask_reg;
u32 val;

DRM_WARN("[transcoder %s] PSR aux error\n",
@@ -168,20 +193,25 @@ void intel_psr_irq_handler(struct drm_i915_private *dev_priv, u32 psr_iir)
* TODO: when handling multiple PSR instances a global spinlock
* will be needed to synchronize the value of shared register
*/
- val = I915_READ(EDP_PSR_IMR);
- val |= EDP_PSR_ERROR(cpu_transcoder);
- I915_WRITE(EDP_PSR_IMR, val);
+ if (INTEL_GEN(dev_priv) >= 12)
+ mask_reg = TRANS_PSR_IMR(cpu_transcoder);
+ else
+ mask_reg = EDP_PSR_IMR;
+
+ val = I915_READ(mask_reg);
+ val |= psr_error;
+ I915_WRITE(mask_reg, val);

schedule_work(&dev_priv->psr.work);
}

- if (psr_iir & EDP_PSR_PRE_ENTRY(cpu_transcoder)) {
+ if (psr_iir & psr_entry) {
dev_priv->psr.last_entry_attempt = time_ns;
DRM_DEBUG_KMS("[transcoder %s] PSR entry attempt in 2 vblanks\n",
transcoder_name(cpu_transcoder));
}

- if (psr_iir & EDP_PSR_POST_EXIT(cpu_transcoder)) {
+ if (psr_iir & psr_exit) {
dev_priv->psr.last_exit = time_ns;
DRM_DEBUG_KMS("[transcoder %s] PSR exit completed\n",
transcoder_name(cpu_transcoder));
@@ -731,8 +761,13 @@ static void intel_psr_enable_locked(struct drm_i915_private *dev_priv,
* first time that PSR HW tries to activate so lets keep PSR disabled
* to avoid any rendering problems.
*/
- val = I915_READ(EDP_PSR_IIR);
- val &= EDP_PSR_ERROR(dev_priv->psr.transcoder);
+ if (INTEL_GEN(dev_priv) >= 12) {
+ val = I915_READ(TRANS_PSR_IIR(dev_priv->psr.transcoder));
+ val &= TRANS_PSR_ERROR;
+ } else {
+ val = I915_READ(EDP_PSR_IIR);
+ val &= EDP_PSR_ERROR(dev_priv->psr.transcoder);
+ }
if (val) {
dev_priv->psr.sink_not_reliable = true;
DRM_DEBUG_KMS("PSR interruption error set, not enabling PSR\n");
diff --git a/drivers/gpu/drm/i915/display/intel_psr.h b/drivers/gpu/drm/i915/display/intel_psr.h
index 46e4de8b8cd5..6570a23a68b2 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.h
+++ b/drivers/gpu/drm/i915/display/intel_psr.h
@@ -6,6 +6,7 @@
#ifndef __INTEL_PSR_H__
#define __INTEL_PSR_H__

+#include "intel_display.h"
#include "intel_frontbuffer.h"

struct drm_i915_private;
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 77391d8325bf..6024a6ef1c76 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2655,11 +2655,22 @@ gen8_de_misc_irq_handler(struct drm_i915_private *dev_priv, u32 iir)
}

if (iir & GEN8_DE_EDP_PSR) {
- u32 psr_iir = I915_READ(EDP_PSR_IIR);
+ u32 psr_iir;
+
+ if (INTEL_GEN(dev_priv) >= 12) {
+ enum transcoder trans = dev_priv->psr.transcoder;
+
+ psr_iir = I915_READ(TRANS_PSR_IIR(trans));
+ I915_WRITE(TRANS_PSR_IIR(trans), psr_iir);
+ } else {
+ psr_iir = I915_READ(EDP_PSR_IIR);
+ I915_WRITE(EDP_PSR_IIR, psr_iir);
+ }
+
+ if (psr_iir)
+ found = true;

intel_psr_irq_handler(dev_priv, psr_iir);
- I915_WRITE(EDP_PSR_IIR, psr_iir);
- found = true;
}

if (!found)
@@ -3279,8 +3290,23 @@ static void gen11_irq_reset(struct drm_i915_private *dev_priv)

intel_uncore_write(uncore, GEN11_DISPLAY_INT_CTL, 0);

- intel_uncore_write(uncore, EDP_PSR_IMR, 0xffffffff);
- intel_uncore_write(uncore, EDP_PSR_IIR, 0xffffffff);
+ if (INTEL_GEN(dev_priv) >= 12) {
+ enum transcoder trans;
+
+ for (trans = TRANSCODER_A; trans <= TRANSCODER_D; trans++) {
+ enum intel_display_power_domain domain;
+
+ domain = POWER_DOMAIN_TRANSCODER(trans);
+ if (!intel_display_power_is_enabled(dev_priv, domain))
+ continue;
+
+ intel_uncore_write(uncore, TRANS_PSR_IMR(trans), 0xffffffff);
+ intel_uncore_write(uncore, TRANS_PSR_IIR(trans), 0xffffffff);
+ }
+ } else {
+ intel_uncore_write(uncore, EDP_PSR_IMR, 0xffffffff);
+ intel_uncore_write(uncore, EDP_PSR_IIR, 0xffffffff);
+ }

for_each_pipe(dev_priv, pipe)
if (intel_display_power_is_enabled(dev_priv,
@@ -3793,7 +3819,21 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
else if (IS_BROADWELL(dev_priv))
de_port_enables |= GEN8_PORT_DP_A_HOTPLUG;

- gen3_assert_iir_is_zero(uncore, EDP_PSR_IIR);
+ if (INTEL_GEN(dev_priv) >= 12) {
+ enum transcoder trans;
+
+ for (trans = TRANSCODER_A; trans <= TRANSCODER_D; trans++) {
+ enum intel_display_power_domain domain;
+
+ domain = POWER_DOMAIN_TRANSCODER(trans);
+ if (!intel_display_power_is_enabled(dev_priv, domain))
+ continue;
+
+ gen3_assert_iir_is_zero(uncore, TRANS_PSR_IIR(trans));
+ }
+ } else {
+ gen3_assert_iir_is_zero(uncore, EDP_PSR_IIR);
+ }

for_each_pipe(dev_priv, pipe) {
dev_priv->de_irq_mask[pipe] = ~de_pipe_masked;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 3417f75b7c4c..045d421e9a7a 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4221,7 +4221,7 @@ enum {
#define EDP_PSR_TP1_TIME_0us (3 << 4)
#define EDP_PSR_IDLE_FRAME_SHIFT 0

-/* Bspec claims those aren't shifted but stay at 0x64800 */
+/* Bspec claims those aren't shifted but stay at 0x64800 until TGL */
#define EDP_PSR_IMR _MMIO(0x64834)
#define EDP_PSR_IIR _MMIO(0x64838)
#define _EDP_PSR_TRANS_SHIFT(trans) ((trans) == TRANSCODER_EDP ? \
@@ -4231,6 +4231,14 @@ enum {
#define EDP_PSR_POST_EXIT(trans) (0x2 << _EDP_PSR_TRANS_SHIFT(trans))
#define EDP_PSR_PRE_ENTRY(trans) (0x1 << _EDP_PSR_TRANS_SHIFT(trans))

+#define _PSR_IMR_A 0x60814
+#define _PSR_IIR_A 0x60818
+#define TRANS_PSR_IMR(tran) _MMIO_TRANS2(tran, _PSR_IMR_A) /* TGL+ */
+#define TRANS_PSR_IIR(tran) _MMIO_TRANS2(tran, _PSR_IIR_A) /* TGL+ */
+#define TRANS_PSR_ERROR (1 << 2)
+#define TRANS_PSR_POST_EXIT (1 << 1)
+#define TRANS_PSR_PRE_ENTRY (1 << 0)
+
#define _SRD_AUX_CTL_A 0x60810
#define _SRD_AUX_CTL_EDP 0x6f810
#define EDP_PSR_AUX_CTL(tran) _MMIO(_PSR_ADJ(tran, _SRD_AUX_CTL_A))
--
2.21.0