[Intel-gfx] [PATCH v3 16/22] drm/i915/rkl: Don't try to access transcoder D

[Matt Roper]

There are a couple places in our driver that loop over transcoders A..D
for gen11+; since RKL only has three pipes/transcoders, this can lead to
unclaimed register reads/writes.  We should add checks for transcoder
existence where appropriate.

v2: Move one transcoder check that wound up in the wrong function after
    conflict resolution.  It belongs in bdw_get_trans_port_sync_config
    rather than bxt_get_dsi_transcoder_state.

Cc: Aditya Swarup <aditya.swarup at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 3 +++
 drivers/gpu/drm/i915/i915_irq.c          | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 0ab03282c397..f93bc0661d00 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4131,6 +4131,9 @@ static void bdw_get_trans_port_sync_config(struct intel_crtc_state *crtc_state)
 		enum intel_display_power_domain power_domain;
 		intel_wakeref_t trans_wakeref;
 
+		if (!HAS_TRANSCODER(dev_priv, cpu_transcoder))
+			continue;
+
 		power_domain = POWER_DOMAIN_TRANSCODER(cpu_transcoder);
 		trans_wakeref = intel_display_power_get_if_enabled(dev_priv,
 								   power_domain);
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 3c3fb9d9df62..297d4cacfb6a 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2849,6 +2849,9 @@ static void gen11_display_irq_reset(struct drm_i915_private *dev_priv)
 		for (trans = TRANSCODER_A; trans <= TRANSCODER_D; trans++) {
 			enum intel_display_power_domain domain;
 
+			if (!HAS_TRANSCODER(dev_priv, trans))
+				continue;
+
 			domain = POWER_DOMAIN_TRANSCODER(trans);
 			if (!intel_display_power_is_enabled(dev_priv, domain))
 				continue;
@@ -3397,6 +3400,9 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
 		for (trans = TRANSCODER_A; trans <= TRANSCODER_D; trans++) {
 			enum intel_display_power_domain domain;
 
+			if (!HAS_TRANSCODER(dev_priv, trans))
+				continue;
+
 			domain = POWER_DOMAIN_TRANSCODER(trans);
 			if (!intel_display_power_is_enabled(dev_priv, domain))
 				continue;
-- 
2.24.1