drm/i915/dsi: fuse dsi_send_pkt_payld() and add_payld_to_queue()

Having two functions for this seems like excess duplication and
parameter juggling. Merge them together.

While at it, drop the extra error message, as wait_for_payload_credits()
already prints an error, and switch from incidental -EPERM (i.e. -1) to
actual error codes.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/f74f7462a36e76070db6b4c01616d0eb663b9938.1633000838.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/icl_dsi.c

@@ -129,27 +129,35 @@ static void wait_for_cmds_dispatched_to_panel(struct intel_encoder *encoder)
 	}
 }
 
-static bool add_payld_to_queue(struct intel_dsi_host *host, const u8 *data,
-			       u32 len)
+static int dsi_send_pkt_payld(struct intel_dsi_host *host,
+			      const struct mipi_dsi_packet *packet)
 {
 	struct intel_dsi *intel_dsi = host->intel_dsi;
-	struct drm_i915_private *dev_priv = to_i915(intel_dsi->base.base.dev);
+	struct drm_i915_private *i915 = to_i915(intel_dsi->base.base.dev);
 	enum transcoder dsi_trans = dsi_port_to_transcoder(host->port);
+	const u8 *data = packet->payload;
+	u32 len = packet->payload_length;
 	int i, j;
 
+	/* payload queue can accept *256 bytes*, check limit */
+	if (len > MAX_PLOAD_CREDIT * 4) {
+		drm_err(&i915->drm, "payload size exceeds max queue limit\n");
+		return -EINVAL;
+	}
+
 	for (i = 0; i < len; i += 4) {
 		u32 tmp = 0;
 
-		if (!wait_for_payload_credits(dev_priv, dsi_trans, 1))
-			return false;
+		if (!wait_for_payload_credits(i915, dsi_trans, 1))
+			return -EBUSY;
 
 		for (j = 0; j < min_t(u32, len - i, 4); j++)
 			tmp |= *data++ << 8 * j;
 
-		intel_de_write(dev_priv, DSI_CMD_TXPYLD(dsi_trans), tmp);
+		intel_de_write(i915, DSI_CMD_TXPYLD(dsi_trans), tmp);
 	}
 
-	return true;
+	return 0;
 }
 
 static int dsi_send_pkt_hdr(struct intel_dsi_host *host,
@@ -187,27 +195,6 @@ static int dsi_send_pkt_hdr(struct intel_dsi_host *host,
 	return 0;
 }
 
-static int dsi_send_pkt_payld(struct intel_dsi_host *host,
-			      const struct mipi_dsi_packet *packet)
-{
-	struct intel_dsi *intel_dsi = host->intel_dsi;
-	struct drm_i915_private *i915 = to_i915(intel_dsi->base.base.dev);
-
-	/* payload queue can accept *256 bytes*, check limit */
-	if (packet->payload_length > MAX_PLOAD_CREDIT * 4) {
-		drm_err(&i915->drm, "payload size exceeds max queue limit\n");
-		return -1;
-	}
-
-	/* load data into command payload queue */
-	if (!add_payld_to_queue(host, packet->payload, packet->payload_length)) {
-		drm_err(&i915->drm, "adding payload to queue failed\n");
-		return -1;
-	}
-
-	return 0;
-}
-
 void icl_dsi_frame_update(struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);