drm/amd: Avoid reading the VBIOS part number twice

The VBIOS part number is read both in amdgpu_atom_parse() as well
as in atom_get_vbios_pn() and stored twice in the `struct atom_context`
structure. Remove the first unnecessary read and move the `pr_info`
line from that read into the second.

v2: squash in unused variable removal
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c

@@ -1776,7 +1776,7 @@ static ssize_t amdgpu_atombios_get_vbios_version(struct device *dev,
 	struct amdgpu_device *adev = drm_to_adev(ddev);
 	struct atom_context *ctx = adev->mode_info.atom_context;
 
-	return sysfs_emit(buf, "%s\n", ctx->vbios_version);
+	return sysfs_emit(buf, "%s\n", ctx->vbios_pn);
 }
 
 static DEVICE_ATTR(vbios_version, 0444, amdgpu_atombios_get_vbios_version,

drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c

@@ -60,10 +60,10 @@ static bool is_fru_eeprom_supported(struct amdgpu_device *adev, u32 *fru_addr)
 	switch (adev->asic_type) {
 	case CHIP_VEGA20:
 		/* D161 and D163 are the VG20 server SKUs */
-		if (strnstr(atom_ctx->vbios_version, "D161",
-			    sizeof(atom_ctx->vbios_version)) ||
-		    strnstr(atom_ctx->vbios_version, "D163",
-			    sizeof(atom_ctx->vbios_version))) {
+		if (strnstr(atom_ctx->vbios_pn, "D161",
+			    sizeof(atom_ctx->vbios_pn)) ||
+		    strnstr(atom_ctx->vbios_pn, "D163",
+			    sizeof(atom_ctx->vbios_pn))) {
 			if (fru_addr)
 				*fru_addr = FRU_EEPROM_MADDR_6;
 			return true;
@@ -72,16 +72,16 @@ static bool is_fru_eeprom_supported(struct amdgpu_device *adev, u32 *fru_addr)
 		}
 	case CHIP_ALDEBARAN:
 		/* All Aldebaran SKUs have an FRU */
-		if (!strnstr(atom_ctx->vbios_version, "D673",
-			     sizeof(atom_ctx->vbios_version)))
+		if (!strnstr(atom_ctx->vbios_pn, "D673",
+			     sizeof(atom_ctx->vbios_pn)))
 			if (fru_addr)
 				*fru_addr = FRU_EEPROM_MADDR_6;
 		return true;
 	case CHIP_SIENNA_CICHLID:
-		if (strnstr(atom_ctx->vbios_version, "D603",
-			    sizeof(atom_ctx->vbios_version))) {
-			if (strnstr(atom_ctx->vbios_version, "D603GLXE",
-				    sizeof(atom_ctx->vbios_version))) {
+		if (strnstr(atom_ctx->vbios_pn, "D603",
+			    sizeof(atom_ctx->vbios_pn))) {
+			if (strnstr(atom_ctx->vbios_pn, "D603GLXE",
+				    sizeof(atom_ctx->vbios_pn))) {
 				return false;
 			} else {
 				if (fru_addr)

drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c

@@ -1722,7 +1722,7 @@ static int amdgpu_debugfs_firmware_info_show(struct seq_file *m, void *unused)
 	seq_printf(m, "MES feature version: %u, firmware version: 0x%08x\n",
 		   fw_info.feature, fw_info.ver);
 
-	seq_printf(m, "VBIOS version: %s\n", ctx->vbios_version);
+	seq_printf(m, "VBIOS version: %s\n", ctx->vbios_pn);
 
 	return 0;
 }

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c

@@ -2442,10 +2442,10 @@ static void amdgpu_ras_get_quirks(struct amdgpu_device *adev)
 	if (!ctx)
 		return;
 
-	if (strnstr(ctx->vbios_version, "D16406",
-		    sizeof(ctx->vbios_version)) ||
-		strnstr(ctx->vbios_version, "D36002",
-			sizeof(ctx->vbios_version)))
+	if (strnstr(ctx->vbios_pn, "D16406",
+		    sizeof(ctx->vbios_pn)) ||
+		strnstr(ctx->vbios_pn, "D36002",
+			sizeof(ctx->vbios_pn)))
 		adev->ras_hw_enabled |= (1 << AMDGPU_RAS_BLOCK__GFX);
 }
 

drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c

@@ -194,9 +194,9 @@ static bool __get_eeprom_i2c_addr(struct amdgpu_device *adev,
 		/* VEGA20 and ARCTURUS */
 		if (adev->asic_type == CHIP_VEGA20)
 			control->i2c_address = EEPROM_I2C_MADDR_0;
-		else if (strnstr(atom_ctx->vbios_version,
+		else if (strnstr(atom_ctx->vbios_pn,
 				 "D342",
-				 sizeof(atom_ctx->vbios_version)))
+				 sizeof(atom_ctx->vbios_pn)))
 			control->i2c_address = EEPROM_I2C_MADDR_0;
 		else
 			control->i2c_address = EEPROM_I2C_MADDR_4;
@@ -205,8 +205,8 @@ static bool __get_eeprom_i2c_addr(struct amdgpu_device *adev,
 		control->i2c_address = EEPROM_I2C_MADDR_0;
 		return true;
 	case IP_VERSION(13, 0, 2):
-		if (strnstr(atom_ctx->vbios_version, "D673",
-			    sizeof(atom_ctx->vbios_version)))
+		if (strnstr(atom_ctx->vbios_pn, "D673",
+			    sizeof(atom_ctx->vbios_pn)))
 			control->i2c_address = EEPROM_I2C_MADDR_4;
 		else
 			control->i2c_address = EEPROM_I2C_MADDR_0;

drivers/gpu/drm/amd/amdgpu/atom.c

@@ -1438,6 +1438,8 @@ static void atom_get_vbios_pn(struct atom_context *ctx)
 
 		ctx->vbios_pn[count] = 0;
 	}
+
+	pr_info("ATOM BIOS: %s\n", ctx->vbios_pn);
 }
 
 static void atom_get_vbios_version(struct atom_context *ctx)
@@ -1460,11 +1462,9 @@ struct atom_context *amdgpu_atom_parse(struct card_info *card, void *bios)
 	int base;
 	struct atom_context *ctx =
 	    kzalloc(sizeof(struct atom_context), GFP_KERNEL);
-	char *str;
 	struct _ATOM_ROM_HEADER *atom_rom_header;
 	struct _ATOM_MASTER_DATA_TABLE *master_table;
 	struct _ATOM_FIRMWARE_INFO *atom_fw_info;
-	u16 idx;
 
 	if (!ctx)
 		return NULL;
@@ -1502,16 +1502,6 @@ struct atom_context *amdgpu_atom_parse(struct card_info *card, void *bios)
 		return NULL;
 	}
 
-	idx = CU16(ATOM_ROM_PART_NUMBER_PTR);
-	if (idx == 0)
-		idx = 0x80;
-
-	str = CSTR(idx);
-	if (*str != '\0') {
-		pr_info("ATOM BIOS: %s\n", str);
-		strlcpy(ctx->vbios_version, str, sizeof(ctx->vbios_version));
-	}
-
 	atom_rom_header = (struct _ATOM_ROM_HEADER *)CSTR(base);
 	if (atom_rom_header->usMasterDataTableOffset != 0) {
 		master_table = (struct _ATOM_MASTER_DATA_TABLE *)

drivers/gpu/drm/amd/amdgpu/atom.h

@@ -33,7 +33,6 @@ struct drm_device;
 #define ATOM_ATI_MAGIC_PTR	0x30
 #define ATOM_ATI_MAGIC		" 761295520"
 #define ATOM_ROM_TABLE_PTR	0x48
-#define ATOM_ROM_PART_NUMBER_PTR	0x6E
 
 #define ATOM_ROM_MAGIC		"ATOM"
 #define ATOM_ROM_MAGIC_PTR	4
@@ -143,7 +142,6 @@ struct atom_context {
 	int io_mode;
 	uint32_t *scratch;
 	int scratch_size_bytes;
-	char vbios_version[20];
 
 	uint8_t name[STRLEN_LONG];
 	uint8_t vbios_pn[STRLEN_LONG];