drm/amd: fix compilation issue with legacy gcc

This patch is used to fix following compilation issue with legacy gcc

error: ‘for’ loop initial declarations are only allowed in C99 mode
Signed-off-by: bobzhou <bob.zhou@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c

@@ -137,8 +137,9 @@ static uint8_t get_lowest_dpia_index(struct dc_link *link)
 {
 	const struct dc *dc_struct = link->dc;
 	uint8_t idx = 0xFF;
+	int i;
 
-	for (int i = 0; i < MAX_PIPES * 2; ++i) {
+	for (i = 0; i < MAX_PIPES * 2; ++i) {
 
 		if (!dc_struct->links[i] ||
 				dc_struct->links[i]->ep_type != DISPLAY_ENDPOINT_USB4_DPIA)
@@ -165,8 +166,9 @@ static int get_host_router_total_bw(struct dc_link *link, uint8_t type)
 	uint8_t idx = (link->link_index - lowest_dpia_index) / 2, idx_temp = 0;
 	struct dc_link *link_temp;
 	int total_bw = 0;
+	int i;
 
-	for (int i = 0; i < MAX_PIPES * 2; ++i) {
+	for (i = 0; i < MAX_PIPES * 2; ++i) {
 
 		if (!dc_struct->links[i] || dc_struct->links[i]->ep_type != DISPLAY_ENDPOINT_USB4_DPIA)
 			continue;
@@ -467,12 +469,13 @@ bool dpia_validate_usb4_bw(struct dc_link **link, int *bw_needed_per_dpia, uint8
 	bool ret = true;
 	int bw_needed_per_hr[MAX_HR_NUM] = { 0, 0 };
 	uint8_t lowest_dpia_index = 0, dpia_index = 0;
+	uint8_t i;
 
 	if (!num_dpias || num_dpias > MAX_DPIA_NUM)
 		return ret;
 
 	//Get total Host Router BW & Validate against each Host Router max BW
-	for (uint8_t i = 0; i < num_dpias; ++i) {
+	for (i = 0; i < num_dpias; ++i) {
 
 		if (!link[i]->dpia_bw_alloc_config.bw_alloc_enabled)
 			continue;

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c

@@ -325,6 +325,7 @@ static int smu_v13_0_6_setup_driver_pptable(struct smu_context *smu)
 	struct PPTable_t *pptable =
 		(struct PPTable_t *)smu_table->driver_pptable;
 	int ret;
+	int i;
 
 	/* Store one-time values in driver PPTable */
 	if (!pptable->Init) {
@@ -339,7 +340,7 @@ static int smu_v13_0_6_setup_driver_pptable(struct smu_context *smu)
 		pptable->MinGfxclkFrequency =
 			SMUQ10_TO_UINT(metrics->MinGfxclkFrequency);
 
-		for (int i = 0; i < 4; ++i) {
+		for (i = 0; i < 4; ++i) {
 			pptable->FclkFrequencyTable[i] =
 				SMUQ10_TO_UINT(metrics->FclkFrequencyTable[i]);
 			pptable->UclkFrequencyTable[i] =
@@ -466,7 +467,7 @@ static int smu_v13_0_6_set_default_dpm_table(struct smu_context *smu)
 	struct PPTable_t *pptable =
 		(struct PPTable_t *)smu_table->driver_pptable;
 	uint32_t gfxclkmin, gfxclkmax, levels;
-	int ret = 0, i;
+	int ret = 0, i, j;
 	struct smu_v13_0_6_dpm_map dpm_map[] = {
 		{ SMU_SOCCLK, SMU_FEATURE_DPM_SOCCLK_BIT,
 		  &dpm_context->dpm_tables.soc_table,
@@ -513,7 +514,7 @@ static int smu_v13_0_6_set_default_dpm_table(struct smu_context *smu)
 		dpm_table->max = dpm_table->dpm_levels[0].value;
 	}
 
-	for (int j = 0; j < ARRAY_SIZE(dpm_map); j++) {
+	for (j = 0; j < ARRAY_SIZE(dpm_map); j++) {
 		dpm_table = dpm_map[j].dpm_table;
 		levels = 1;
 		if (smu_cmn_feature_is_enabled(smu, dpm_map[j].feature_num)) {