drm/apple: Add support for the macOS 13.2 DCP firmware

This adds support for multiple incompatible DCP firmware versions.
The approach taken here duplicates more than necessary. Unmodified calls
do not need to be templated. For simplicity and in the expectation that
more calls and callbacks are modified in the future everything is
templated.

Signed-off-by: Janne Grunau <[email protected]>

Author: jannau

drivers/gpu/drm/apple/Makefile

@@ -5,6 +5,8 @@ CFLAGS_trace.o = -I$(src)
 appledrm-y := apple_drv.o
 
 apple_dcp-y := dcp.o dcp_backlight.o iomfb.o parser.o
+apple_dcp-y += iomfb_v12_3.o
+apple_dcp-y += iomfb_v13_2.o
 apple_dcp-$(CONFIG_TRACING) += trace.o
 
 apple_piodma-y := dummy-piodma.o

drivers/gpu/drm/apple/dcp-internal.h

@@ -11,6 +11,8 @@
 #include <linux/scatterlist.h>
 
 #include "iomfb.h"
+#include "iomfb_v12_3.h"
+#include "iomfb_v13_2.h"
 
 #define DCP_MAX_PLANES 2
 
@@ -19,6 +21,7 @@ struct apple_dcp;
 enum dcp_firmware_version {
 	DCP_FIRMWARE_UNKNOWN,
 	DCP_FIRMWARE_V_12_3,
+	DCP_FIRMWARE_V_13_2,
 };
 
 enum {
@@ -134,11 +137,17 @@ struct apple_dcp {
 	struct dcp_channel ch_cmd, ch_oobcmd;
 	struct dcp_channel ch_cb, ch_oobcb, ch_async;
 
+	/* iomfb EP callback handlers */
+	const iomfb_cb_handler *cb_handlers;
+
 	/* Active chunked transfer. There can only be one at a time. */
 	struct dcp_chunks chunks;
 
 	/* Queued swap. Owned by the DCP to avoid per-swap memory allocation */
-	struct dcp_swap_submit_req swap;
+	union {
+		struct dcp_swap_submit_req_v12_3 v12_3;
+		struct dcp_swap_submit_req_v13_2 v13_2;
+	} swap;
 
 	/* Current display mode */
 	bool valid_mode;

drivers/gpu/drm/apple/dcp.c

@@ -404,6 +404,8 @@ static enum dcp_firmware_version dcp_check_firmware_version(struct device *dev)
 
 	if (strncmp(compat_str, "12.3.0", sizeof(compat_str)) == 0)
 		return DCP_FIRMWARE_V_12_3;
+	if (strncmp(compat_str, "13.2.0", sizeof(compat_str)) == 0)
+		return DCP_FIRMWARE_V_13_2;
 
 	dev_err(dev, "DCP firmware-compat %s (FW: %s) is not supported\n",
 		compat_str, fw_str);