[Intel-gfx] [PATCH v4 18/22] drm/i915/bios: Determine panel type via PNPID match

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Apparently when the VBT panel_type==0xff we should trawl through
the PNPID table and check for a match against the EDID. If a
match is found the index gives us the panel_type.

Tried to match the Windows behaviour here with first looking
for an exact match, and if one isn't found we fall back to
looking for a match w/o the mfg year/week.

v2: Rebase due to vlv_dsi changes

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5545
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/icl_dsi.c    |  2 +-
 drivers/gpu/drm/i915/display/intel_bios.c | 82 ++++++++++++++++++++---
 drivers/gpu/drm/i915/display/intel_bios.h |  4 +-
 drivers/gpu/drm/i915/display/intel_dp.c   |  2 +-
 drivers/gpu/drm/i915/display/intel_lvds.c |  2 +-
 drivers/gpu/drm/i915/display/intel_sdvo.c |  2 +-
 drivers/gpu/drm/i915/display/vlv_dsi.c    |  2 +-
 7 files changed, 82 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index 688176d4a54a..49715485a3a6 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -2048,7 +2048,7 @@ void icl_dsi_init(struct drm_i915_private *dev_priv)
 	/* attach connector to encoder */
 	intel_connector_attach_encoder(intel_connector, encoder);
 
-	intel_bios_init_panel(dev_priv);
+	intel_bios_init_panel(dev_priv, NULL);
 
 	mutex_lock(&dev->mode_config.mutex);
 	intel_panel_add_vbt_lfp_fixed_mode(intel_connector);
diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index 0e76c554581a..4c0680356134 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -582,6 +582,14 @@ get_lvds_fp_timing(const struct bdb_lvds_lfp_data *data,
 	return (const void *)data + ptrs->ptr[index].fp_timing.offset;
 }
 
+static const struct lvds_pnp_id *
+get_lvds_pnp_id(const struct bdb_lvds_lfp_data *data,
+		const struct bdb_lvds_lfp_data_ptrs *ptrs,
+		int index)
+{
+	return (const void *)data + ptrs->ptr[index].panel_pnp_id.offset;
+}
+
 static const struct bdb_lvds_lfp_data_tail *
 get_lfp_data_tail(const struct bdb_lvds_lfp_data *data,
 		  const struct bdb_lvds_lfp_data_ptrs *ptrs)
@@ -592,6 +600,52 @@ get_lfp_data_tail(const struct bdb_lvds_lfp_data *data,
 		return NULL;
 }
 
+static int pnp_id_panel_type(struct drm_i915_private *i915,
+			     const struct edid *edid)
+{
+	const struct bdb_lvds_lfp_data *data;
+	const struct bdb_lvds_lfp_data_ptrs *ptrs;
+	const struct lvds_pnp_id *edid_id;
+	struct lvds_pnp_id edid_id_nodate;
+	int i, best = -1;
+
+	if (!edid)
+		return -1;
+
+	edid_id = (const void *)&edid->mfg_id[0];
+
+	edid_id_nodate = *edid_id;
+	edid_id_nodate.mfg_week = 0;
+	edid_id_nodate.mfg_year = 0;
+
+	ptrs = find_section(i915, BDB_LVDS_LFP_DATA_PTRS);
+	if (!ptrs)
+		return -1;
+
+	data = find_section(i915, BDB_LVDS_LFP_DATA);
+	if (!data)
+		return -1;
+
+	for (i = 0; i < 16; i++) {
+		const struct lvds_pnp_id *vbt_id =
+			get_lvds_pnp_id(data, ptrs, i);
+
+		/* full match? */
+		if (!memcmp(vbt_id, edid_id, sizeof(*vbt_id)))
+			return i;
+
+		/*
+		 * Accept a match w/o date if no full match is found,
+		 * and the VBT entry does not specify a date.
+		 */
+		if (best < 0 &&
+		    !memcmp(vbt_id, &edid_id_nodate, sizeof(*vbt_id)))
+			best = i;
+	}
+
+	return best;
+}
+
 static int vbt_panel_type(struct drm_i915_private *i915)
 {
 	const struct bdb_lvds_options *lvds_options;
@@ -600,7 +654,8 @@ static int vbt_panel_type(struct drm_i915_private *i915)
 	if (!lvds_options)
 		return -1;
 
-	if (lvds_options->panel_type > 0xf) {
+	if (lvds_options->panel_type > 0xf &&
+	    lvds_options->panel_type != 0xff) {
 		drm_dbg_kms(&i915->drm, "Invalid VBT panel type 0x%x\n",
 			    lvds_options->panel_type);
 		return -1;
@@ -612,10 +667,12 @@ static int vbt_panel_type(struct drm_i915_private *i915)
 enum panel_type {
 	PANEL_TYPE_OPREGION,
 	PANEL_TYPE_VBT,
+	PANEL_TYPE_PNPID,
 	PANEL_TYPE_FALLBACK,
 };
 
-static int get_panel_type(struct drm_i915_private *i915)
+static int get_panel_type(struct drm_i915_private *i915,
+			  const struct edid *edid)
 {
 	struct {
 		const char *name;
@@ -623,15 +680,18 @@ static int get_panel_type(struct drm_i915_private *i915)
 	} panel_types[] = {
 		[PANEL_TYPE_OPREGION] = { .name = "OpRegion", .panel_type = -1, },
 		[PANEL_TYPE_VBT] = { .name = "VBT", .panel_type = -1, },
+		[PANEL_TYPE_PNPID] = { .name = "PNPID", .panel_type = -1, },
 		[PANEL_TYPE_FALLBACK] = { .name = "fallback", .panel_type = 0, },
 	};
 	int i;
 
 	panel_types[PANEL_TYPE_OPREGION].panel_type = intel_opregion_get_panel_type(i915);
 	panel_types[PANEL_TYPE_VBT].panel_type = vbt_panel_type(i915);
+	panel_types[PANEL_TYPE_PNPID].panel_type = pnp_id_panel_type(i915, edid);
 
 	for (i = 0; i < ARRAY_SIZE(panel_types); i++) {
-		drm_WARN_ON(&i915->drm, panel_types[i].panel_type > 0xf);
+		drm_WARN_ON(&i915->drm, panel_types[i].panel_type > 0xf &&
+			    panel_types[i].panel_type != 0xff);
 
 		if (panel_types[i].panel_type >= 0)
 			drm_dbg_kms(&i915->drm, "Panel type (%s): %d\n",
@@ -640,7 +700,11 @@ static int get_panel_type(struct drm_i915_private *i915)
 
 	if (panel_types[PANEL_TYPE_OPREGION].panel_type >= 0)
 		i = PANEL_TYPE_OPREGION;
-	else if (panel_types[PANEL_TYPE_VBT].panel_type >= 0)
+	else if (panel_types[PANEL_TYPE_VBT].panel_type == 0xff &&
+		 panel_types[PANEL_TYPE_PNPID].panel_type >= 0)
+		i = PANEL_TYPE_PNPID;
+	else if (panel_types[PANEL_TYPE_VBT].panel_type != 0xff &&
+		 panel_types[PANEL_TYPE_VBT].panel_type >= 0)
 		i = PANEL_TYPE_VBT;
 	else
 		i = PANEL_TYPE_FALLBACK;
@@ -653,7 +717,8 @@ static int get_panel_type(struct drm_i915_private *i915)
 
 /* Parse general panel options */
 static void
-parse_panel_options(struct drm_i915_private *i915)
+parse_panel_options(struct drm_i915_private *i915,
+		    const struct edid *edid)
 {
 	const struct bdb_lvds_options *lvds_options;
 	int panel_type;
@@ -665,7 +730,7 @@ parse_panel_options(struct drm_i915_private *i915)
 
 	i915->vbt.lvds_dither = lvds_options->pixel_dither;
 
-	panel_type = get_panel_type(i915);
+	panel_type = get_panel_type(i915, edid);
 
 	i915->vbt.panel_type = panel_type;
 
@@ -2953,9 +3018,10 @@ void intel_bios_init(struct drm_i915_private *i915)
 	kfree(oprom_vbt);
 }
 
-void intel_bios_init_panel(struct drm_i915_private *i915)
+void intel_bios_init_panel(struct drm_i915_private *i915,
+			   const struct edid *edid)
 {
-	parse_panel_options(i915);
+	parse_panel_options(i915, edid);
 	/*
 	 * Older VBTs provided DTD information for internal displays through
 	 * the "LFP panel tables" block (42).  As of VBT revision 229 the
diff --git a/drivers/gpu/drm/i915/display/intel_bios.h b/drivers/gpu/drm/i915/display/intel_bios.h
index c744d75fa435..be6d57bd0f5a 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.h
+++ b/drivers/gpu/drm/i915/display/intel_bios.h
@@ -33,6 +33,7 @@
 #include <linux/types.h>
 
 struct drm_i915_private;
+struct edid;
 struct intel_bios_encoder_data;
 struct intel_crtc_state;
 struct intel_encoder;
@@ -230,7 +231,8 @@ struct mipi_pps_data {
 } __packed;
 
 void intel_bios_init(struct drm_i915_private *dev_priv);
-void intel_bios_init_panel(struct drm_i915_private *dev_priv);
+void intel_bios_init_panel(struct drm_i915_private *dev_priv,
+			   const struct edid *edid);
 void intel_bios_driver_remove(struct drm_i915_private *dev_priv);
 bool intel_bios_is_valid_vbt(const void *buf, size_t size);
 bool intel_bios_is_tv_present(struct drm_i915_private *dev_priv);
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index a1b5d7f5388b..41ac55a700e9 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -5179,7 +5179,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 	}
 	intel_connector->edid = edid;
 
-	intel_bios_init_panel(dev_priv);
+	intel_bios_init_panel(dev_priv, IS_ERR(edid) ? NULL : edid);
 
 	intel_panel_add_edid_fixed_modes(intel_connector,
 					 dev_priv->vbt.drrs_type != DRRS_TYPE_NONE);
diff --git a/drivers/gpu/drm/i915/display/intel_lvds.c b/drivers/gpu/drm/i915/display/intel_lvds.c
index 554badf041f2..660bb95f2bf7 100644
--- a/drivers/gpu/drm/i915/display/intel_lvds.c
+++ b/drivers/gpu/drm/i915/display/intel_lvds.c
@@ -967,7 +967,7 @@ void intel_lvds_init(struct drm_i915_private *dev_priv)
 	}
 	intel_connector->edid = edid;
 
-	intel_bios_init_panel(dev_priv);
+	intel_bios_init_panel(dev_priv, IS_ERR(edid) ? NULL : edid);
 
 	/* Try EDID first */
 	intel_panel_add_edid_fixed_modes(intel_connector,
diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c
index 661a1057a073..25195bc1edca 100644
--- a/drivers/gpu/drm/i915/display/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/display/intel_sdvo.c
@@ -2900,7 +2900,7 @@ intel_sdvo_lvds_init(struct intel_sdvo *intel_sdvo, int device)
 	if (!intel_sdvo_create_enhance_property(intel_sdvo, intel_sdvo_connector))
 		goto err;
 
-	intel_bios_init_panel(i915);
+	intel_bios_init_panel(i915, NULL);
 
 	/*
 	 * Fetch modes from VBT. For SDVO prefer the VBT mode since some
diff --git a/drivers/gpu/drm/i915/display/vlv_dsi.c b/drivers/gpu/drm/i915/display/vlv_dsi.c
index 08fb554ff7ad..1af6e927af9b 100644
--- a/drivers/gpu/drm/i915/display/vlv_dsi.c
+++ b/drivers/gpu/drm/i915/display/vlv_dsi.c
@@ -1929,7 +1929,7 @@ void vlv_dsi_init(struct drm_i915_private *dev_priv)
 	else
 		intel_dsi->ports = BIT(port);
 
-	intel_bios_init_panel(dev_priv);
+	intel_bios_init_panel(dev_priv, NULL);
 
 	intel_dsi->dcs_backlight_ports = dev_priv->vbt.dsi.bl_ports;
 	intel_dsi->dcs_cabc_ports = dev_priv->vbt.dsi.cabc_ports;
-- 
2.35.1