[Intel-gfx] [PATCH v5 2/5] drm/i915: Parse and set stepping for platforms with GMD

[Radhakrishna Sripada <radhakrishna.sripada@intel.com>]

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

The GMD step field do not properly match the current stepping convention
that we use(STEP_A0, STEP_A1, STEP_B0...).

One platform could have { arch = 12, rel = 70, step = 1 } and the
actual stepping is STEP_B0 but without the translation of the step
field would mean STEP_A1.
That is why we will need to have gmd_to_intel_step tables for each IP.

v2:
 - Pass the updated ip version structure

Cc: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 drivers/gpu/drm/i915/intel_step.c | 60 +++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_step.c b/drivers/gpu/drm/i915/intel_step.c
index 42b3133d8387..bc966478f0f8 100644
--- a/drivers/gpu/drm/i915/intel_step.c
+++ b/drivers/gpu/drm/i915/intel_step.c
@@ -135,6 +135,48 @@ static const struct intel_step_info adlp_n_revids[] = {
 	[0x0] = { COMMON_GT_MEDIA_STEP(A0), .display_step = STEP_D0 },
 };
 
+struct gmd_to_intel_step {
+	struct ip_version gmd;
+	enum intel_step step;
+};
+
+static const struct gmd_to_intel_step gmd_graphics_table[] = {
+	{ .gmd.ver = 12, .gmd.rel = 70, .gmd.step = 0, .step = STEP_A0 },
+	{ .gmd.ver = 12, .gmd.rel = 70, .gmd.step = 4, .step = STEP_B0 },
+	{ .gmd.ver = 12, .gmd.rel = 71, .gmd.step = 0, .step = STEP_A0 },
+	{ .gmd.ver = 12, .gmd.rel = 71, .gmd.step = 4, .step = STEP_B0 },
+	{ .gmd.ver = 12, .gmd.rel = 73, .gmd.step = 0, .step = STEP_A0 },
+	{ .gmd.ver = 12, .gmd.rel = 73, .gmd.step = 4, .step = STEP_B0 },
+};
+
+static const struct gmd_to_intel_step gmd_media_table[] = {
+	{ .gmd.ver = 13, .gmd.rel = 70, .gmd.step = 0, .step = STEP_A0 },
+	{ .gmd.ver = 13, .gmd.rel = 70, .gmd.step = 4, .step = STEP_B0 },
+};
+
+static const struct gmd_to_intel_step gmd_display_table[] = {
+	{ .gmd.ver = 14, .gmd.rel = 0, .gmd.step = 0, .step = STEP_A0 },
+	{ .gmd.ver = 14, .gmd.rel = 0, .gmd.step = 4, .step = STEP_B0 },
+};
+
+static u8 gmd_to_intel_step(struct drm_i915_private *i915,
+			    struct ip_version *gmd,
+			    const struct gmd_to_intel_step *table,
+			    int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++) {
+		if (table[i].gmd.ver == gmd->ver &&
+		    table[i].gmd.rel == gmd->rel &&
+		    table[i].gmd.step == gmd->step)
+			return table[i].step;
+	}
+
+	drm_dbg(&i915->drm, "Using future steppings\n");
+	return STEP_FUTURE;
+}
+
 static void pvc_step_init(struct drm_i915_private *i915, int pci_revid);
 
 void intel_step_init(struct drm_i915_private *i915)
@@ -144,6 +186,24 @@ void intel_step_init(struct drm_i915_private *i915)
 	int revid = INTEL_REVID(i915);
 	struct intel_step_info step = {};
 
+	if (HAS_GMD_ID(i915)) {
+		step.graphics_step = gmd_to_intel_step(i915,
+						       &RUNTIME_INFO(i915)->graphics.ip,
+						       gmd_graphics_table,
+						       ARRAY_SIZE(gmd_graphics_table));
+		step.media_step = gmd_to_intel_step(i915,
+						    &RUNTIME_INFO(i915)->media.ip,
+						    gmd_media_table,
+						    ARRAY_SIZE(gmd_media_table));
+		step.display_step = gmd_to_intel_step(i915,
+						      &RUNTIME_INFO(i915)->display.ip,
+						      gmd_display_table,
+						      ARRAY_SIZE(gmd_display_table));
+		RUNTIME_INFO(i915)->step = step;
+
+		return;
+	}
+
 	if (IS_PONTEVECCHIO(i915)) {
 		pvc_step_init(i915, revid);
 		return;
-- 
2.34.1