drm/i915: refactor transcoders reporting on error state

Instead of keeping track of the number of transcoders, loop through all
the interesting ones and check if there is a correspondent offset.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190222230254.20351-1-lucas.demarchi@intel.com

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b49e789..c747585 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -16448,8 +16448,6 @@ struct intel_display_error_state {
 
        u32 power_well_driver;
 
-       int num_transcoders;
-
        struct intel_cursor_error_state {
                u32 control;
                u32 position;
@@ -16474,6 +16472,7 @@ struct intel_display_error_state {
        } plane[I915_MAX_PIPES];
 
        struct intel_transcoder_error_state {
+               bool available;
                bool power_domain_on;
                enum transcoder cpu_transcoder;
 
@@ -16500,6 +16499,8 @@ intel_display_capture_error_state(struct drm_i915_private *dev_priv)
        };
        int i;
 
+       BUILD_BUG_ON(ARRAY_SIZE(transcoders) != ARRAY_SIZE(error->transcoder));
+
        if (!HAS_DISPLAY(dev_priv))
                return NULL;
 
@@ -16540,14 +16541,13 @@ intel_display_capture_error_state(struct drm_i915_private *dev_priv)
                        error->pipe[i].stat = I915_READ(PIPESTAT(i));
        }
 
-       /* Note: this does not include DSI transcoders. */
-       error->num_transcoders = INTEL_INFO(dev_priv)->num_pipes;
-       if (HAS_DDI(dev_priv))
-               error->num_transcoders++; /* Account for eDP. */
-
-       for (i = 0; i < error->num_transcoders; i++) {
+       for (i = 0; i < ARRAY_SIZE(error->transcoder); i++) {
                enum transcoder cpu_transcoder = transcoders[i];
 
+               if (!INTEL_INFO(dev_priv)->trans_offsets[cpu_transcoder])
+                       continue;
+
+               error->transcoder[i].available = true;
                error->transcoder[i].power_domain_on =
                        __intel_display_power_is_enabled(dev_priv,
                                POWER_DOMAIN_TRANSCODER(cpu_transcoder));
@@ -16611,7 +16611,10 @@ intel_display_print_error_state(struct drm_i915_error_state_buf *m,
                err_printf(m, "  BASE: %08x\n", error->cursor[i].base);
        }
 
-       for (i = 0; i < error->num_transcoders; i++) {
+       for (i = 0; i < ARRAY_SIZE(error->transcoder); i++) {
+               if (!error->transcoder[i].available)
+                       continue;
+
                err_printf(m, "CPU transcoder: %s\n",
                           transcoder_name(error->transcoder[i].cpu_transcoder));
                err_printf(m, "  Power: %s\n",