rockchip: rk3399: Enable per CS training at 666MHz

This enables per CS training at 666MHz and above for ddrfreq per
vendor recommendation. Since the threshold was used for latency was
the same value, this also adds a new value for that.
Signed-off-by: Derek Basehore <dbasehore@chromium.org>

plat/rockchip/rk3399/drivers/dram/dfs.c

@@ -42,7 +42,8 @@
 
 #include <delay_timer.h>
 
-#define ENPER_CS_TRAINING_FREQ	(933)
+#define ENPER_CS_TRAINING_FREQ	(666)
+#define TDFI_LAT_THRESHOLD_FREQ	(928)
 #define PHY_DLL_BYPASS_FREQ	(260)
 
 static const struct pll_div dpll_rates_table[] = {
@@ -731,7 +732,7 @@ static void gen_rk3399_ctl_params_f0(struct timing_related_config
 
 		/* CTL_314 TDFI_WRCSLAT_F0:RW:8:8 */
 		tmp1 = get_pi_wrlat_adj(pdram_timing, timing_config);
-		if (timing_config->freq <= ENPER_CS_TRAINING_FREQ) {
+		if (timing_config->freq <= TDFI_LAT_THRESHOLD_FREQ) {
 			if (tmp1 == 0)
 				tmp = 0;
 			else if (tmp1 < 5)
@@ -744,7 +745,7 @@ static void gen_rk3399_ctl_params_f0(struct timing_related_config
 		mmio_clrsetbits_32(CTL_REG(i, 314), 0xff << 8, tmp << 8);
 
 		/* CTL_314 TDFI_RDCSLAT_F0:RW:0:8 */
-		if ((timing_config->freq <= ENPER_CS_TRAINING_FREQ) &&
+		if ((timing_config->freq <= TDFI_LAT_THRESHOLD_FREQ) &&
 		    (pdram_timing->cl >= 5))
 			tmp = pdram_timing->cl - 5;
 		else
@@ -981,7 +982,7 @@ static void gen_rk3399_ctl_params_f1(struct timing_related_config
 
 		/* CTL_314 TDFI_WRCSLAT_F1:RW:24:8 */
 		tmp1 = get_pi_wrlat_adj(pdram_timing, timing_config);
-		if (timing_config->freq <= ENPER_CS_TRAINING_FREQ) {
+		if (timing_config->freq <= TDFI_LAT_THRESHOLD_FREQ) {
 			if (tmp1 == 0)
 				tmp = 0;
 			else if (tmp1 < 5)
@@ -995,7 +996,7 @@ static void gen_rk3399_ctl_params_f1(struct timing_related_config
 		mmio_clrsetbits_32(CTL_REG(i, 314), 0xff << 24, tmp << 24);
 
 		/* CTL_314 TDFI_RDCSLAT_F1:RW:16:8 */
-		if ((timing_config->freq <= ENPER_CS_TRAINING_FREQ) &&
+		if ((timing_config->freq <= TDFI_LAT_THRESHOLD_FREQ) &&
 		    (pdram_timing->cl >= 5))
 			tmp = pdram_timing->cl - 5;
 		else