media: apple: isp: Parse firmware version from device tree

Required since t8112-isp uses a 32-bit address in the
CISP_CMD_CH_SET_FILE_LOAD command with the macOS 12.4 firmware.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

drivers/media/platform/apple/isp/isp-cmd.c

@@ -2,6 +2,7 @@
 /* Copyright 2023 Eileen Yoon <eyn@gmx.com> */
 
 #include "isp-cmd.h"
+#include "isp-drv.h"
 #include "isp-iommu.h"
 #include "isp-ipc.h"
 
@@ -261,7 +262,7 @@ int isp_cmd_ch_buffer_return(struct apple_isp *isp, u32 chan)
 int isp_cmd_ch_set_file_load(struct apple_isp *isp, u32 chan, u64 addr,
 			     u32 size)
 {
-	if (isp->hw->gen >= ISP_GEN_T8112) {
+	if (isp->fw_compat >= ISP_FIRMWARE_V_13_5) {
 		struct cmd_ch_set_file_load64 args = {
 			.opcode = CISP_OPCODE(CISP_CMD_CH_SET_FILE_LOAD),
 			.chan = chan,

drivers/media/platform/apple/isp/isp-drv.c

@@ -224,6 +224,72 @@ static int apple_isp_init_presets(struct apple_isp *isp)
 	return err;
 }
 
+static const char * isp_fw2str(enum isp_firmware_version version)
+{
+	switch (version) {
+	case ISP_FIRMWARE_V_12_3:
+		return "12.3";
+	case ISP_FIRMWARE_V_12_4:
+		return "12.4";
+	case ISP_FIRMWARE_V_13_5:
+		return "13.5";
+	default:
+		return "unknown";
+	}
+}
+
+#define ISP_FW_VERSION_MIN_LEN	3
+#define ISP_FW_VERSION_MAX_LEN	5
+
+static enum isp_firmware_version isp_read_fw_version(struct device *dev,
+						     const char *name)
+{
+	u32 ver[ISP_FW_VERSION_MAX_LEN];
+	int len = of_property_read_variable_u32_array(dev->of_node, name, ver,
+						      ISP_FW_VERSION_MIN_LEN,
+						      ISP_FW_VERSION_MAX_LEN);
+
+	switch (len) {
+	case 3:
+		if (ver[0] == 12 && ver[1] == 3 && ver[2] <= 1)
+			return ISP_FIRMWARE_V_12_3;
+		else if (ver[0] == 12 && ver[1] == 4 && ver[2] == 0)
+			return ISP_FIRMWARE_V_12_4;
+		else if (ver[0] == 13 && ver[1] == 5 && ver[2] == 0)
+			return ISP_FIRMWARE_V_13_5;
+
+		dev_warn(dev, "unknown %s: %d.%d.%d\n", name, ver[0], ver[1], ver[2]);
+		break;
+	case 4:
+		dev_warn(dev, "unknown %s: %d.%d.%d.%d\n", name, ver[0], ver[1],
+			 ver[2], ver[3]);
+		break;
+	case 5:
+		dev_warn(dev, "unknown %s: %d.%d.%d.%d.%d\n", name, ver[0],
+			 ver[1], ver[2], ver[3], ver[4]);
+		break;
+	default:
+		dev_warn(dev, "could not parse %s: %d\n", name, len);
+		break;
+	}
+
+	return ISP_FIRMWARE_V_UNKNOWN;
+}
+
+static enum isp_firmware_version isp_check_firmware_version(struct device *dev)
+{
+	enum isp_firmware_version version, compat;
+
+	/* firmware version is just informative */
+	version = isp_read_fw_version(dev, "apple,firmware-version");
+	compat = isp_read_fw_version(dev, "apple,firmware-compat");
+
+	dev_info(dev, "ISP firmware-compat: %s (FW: %s)\n", isp_fw2str(compat),
+		 isp_fw2str(version));
+
+	return compat;
+}
+
 static int apple_isp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -243,6 +309,11 @@ static int apple_isp_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, isp);
 	dev_set_drvdata(dev, isp);
 
+	/* Differences between firmware versions are rather minor so try to work
+	 * with unknown firmware.
+	 */
+	isp->fw_compat = isp_check_firmware_version(dev);
+
 	err = of_property_read_u32(dev->of_node, "apple,platform-id",
 				   &isp->platform_id);
 	if (err) {

drivers/media/platform/apple/isp/isp-drv.h

@@ -32,6 +32,13 @@ enum isp_generation {
 	ISP_GEN_T8112,
 };
 
+enum isp_firmware_version {
+	ISP_FIRMWARE_V_UNKNOWN,
+	ISP_FIRMWARE_V_12_3,
+	ISP_FIRMWARE_V_12_4,
+	ISP_FIRMWARE_V_13_5,
+};
+
 struct isp_surf {
 	struct drm_mm_node *mm;
 	struct list_head head;
@@ -180,6 +187,7 @@ struct isp_format {
 struct apple_isp {
 	struct device *dev;
 	const struct apple_isp_hw *hw;
+	enum isp_firmware_version fw_compat;
 	u32 platform_id;
 	u32 temporal_filter;
 	struct isp_preset *presets;