[PATCH v2 06/11] drm/i915/dsb: Add support for GOSUB interrupt

[Chaitanya Kumar Borah]

DSB raises an interrupt when there is a nested GOSUB command or
illegal Head/Tail. Add support to log such errors in the DSB
interrupt handler.

v2: Enable support only in platforms that support this (Ville)

Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dsb.c      | 9 +++++++++
 drivers/gpu/drm/i915/display/intel_dsb_regs.h | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
index 97ea3c655590..5ddc3e340a79 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -634,6 +634,9 @@ static u32 dsb_error_int_status(struct intel_display *display)
 	if (DISPLAY_VER(display) >= 14)
 		errors |= DSB_ATS_FAULT_INT_STATUS;
 
+	if (DISPLAY_VER(display) >= 30)
+		errors |= DSB_GOSUB_INT_STATUS;
+
 	return errors;
 }
 
@@ -648,6 +651,9 @@ static u32 dsb_error_int_en(struct intel_display *display)
 	if (DISPLAY_VER(display) >= 14)
 		errors |= DSB_ATS_FAULT_INT_EN;
 
+	if (DISPLAY_VER(display) >= 30)
+		errors |= DSB_GOSUB_INT_EN;
+
 	return errors;
 }
 
@@ -986,4 +992,7 @@ void intel_dsb_irq_handler(struct intel_display *display,
 	if (errors & DSB_POLL_ERR_INT_STATUS)
 		drm_err(display->drm, "[CRTC:%d:%s] DSB %d poll error\n",
 			crtc->base.base.id, crtc->base.name, dsb_id);
+	if (errors & DSB_GOSUB_INT_STATUS)
+		drm_err(display->drm, "[CRTC:%d:%s] DSB %d GOSUB programming error\n",
+			crtc->base.base.id, crtc->base.name, dsb_id);
 }
diff --git a/drivers/gpu/drm/i915/display/intel_dsb_regs.h b/drivers/gpu/drm/i915/display/intel_dsb_regs.h
index cb6e0e5624a6..230104f36145 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb_regs.h
+++ b/drivers/gpu/drm/i915/display/intel_dsb_regs.h
@@ -51,11 +51,13 @@
 #define   DSB_RESET_SM_STATE_MASK	REG_GENMASK(5, 4)
 #define   DSB_RUN_SM_STATE_MASK		REG_GENMASK(2, 0)
 #define DSB_INTERRUPT(pipe, id)		_MMIO(DSBSL_INSTANCE(pipe, id) + 0x28)
+#define   DSB_GOSUB_INT_EN		REG_BIT(21) /* ptl+ */
 #define   DSB_ATS_FAULT_INT_EN		REG_BIT(20) /* mtl+ */
 #define   DSB_GTT_FAULT_INT_EN		REG_BIT(19)
 #define   DSB_RSPTIMEOUT_INT_EN		REG_BIT(18)
 #define   DSB_POLL_ERR_INT_EN		REG_BIT(17)
 #define   DSB_PROG_INT_EN		REG_BIT(16)
+#define   DSB_GOSUB_INT_STATUS		REG_BIT(5) /* ptl+ */
 #define   DSB_ATS_FAULT_INT_STATUS	REG_BIT(4) /* mtl+ */
 #define   DSB_GTT_FAULT_INT_STATUS	REG_BIT(3)
 #define   DSB_RSPTIMEOUT_INT_STATUS	REG_BIT(2)
-- 
2.25.1