sunxi: dram: Support more sun[457]i dram parameters in Kconfig

This patch allows to configure all the important DRAM parameters in Kconfig.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

board/sunxi/Kconfig

@@ -41,6 +41,15 @@ config DRAM_CLK
 	Set the dram clock speed, valid range 240 - 480, must be a multiple
 	of 24.
 
+if MACH_SUN5I || MACH_SUN7I
+config DRAM_MBUS_CLK
+	int "sunxi mbus clock speed"
+	default 300
+	---help---
+	Set the mbus clock speed. The maximum on sun5i hardware is 300MHz.
+
+endif
+
 config DRAM_ZQ
 	int "sunxi dram zq value"
 	default 123 if MACH_SUN4I || MACH_SUN5I || MACH_SUN6I || MACH_SUN8I
@@ -56,6 +65,40 @@ config DRAM_EMR1
 	---help---
 	Set the dram controller emr1 value.
 
+config DRAM_ODT_EN
+	int "sunxi dram odt_en value"
+	default 0
+	---help---
+	Set the dram controller odt_en parameter. This can be used to
+	enable/disable the ODT feature.
+
+config DRAM_TPR3
+	hex "sunxi dram tpr3 value"
+	default 0
+	---help---
+	Set the dram controller tpr3 parameter. This parameter configures
+	the delay on the command lane and also phase shifts, which are
+	applied for sampling incoming read data. The default value 0
+	means that no phase/delay adjustments are necessary. Properly
+	configuring this parameter increases reliability at high DRAM
+	clock speeds.
+
+config DRAM_DQS_GATING_DELAY
+	hex "sunxi dram dqs_gating_delay value"
+	default 0
+	---help---
+	Set the dram controller dqs_gating_delay parmeter. Each byte
+	encodes the DQS gating delay for each byte lane. The delay
+	granularity is 1/4 cycle. For example, the value 0x05060606
+	means that the delay is 5 quarter-cycles for one lane (1.25
+	cycles) and 6 quarter-cycles (1.5 cycles) for 3 other lanes.
+	The default value 0 means autodetection. The results of hardware
+	autodetection are not very reliable and depend on the chip
+	temperature (sometimes producing different results on cold start
+	and warm reboot). But the accuracy of hardware autodetection
+	is usually good enough, unless running at really high DRAM
+	clocks speeds (up to 600MHz). If unsure, keep as 0.
+
 choice
 	prompt "sunxi dram timings"
 	default DRAM_TIMINGS_VENDOR_MAGIC

board/sunxi/dram_sun4i_auto.c

@@ -9,7 +9,7 @@ static struct dram_para dram_para = {
 	.io_width = 0,
 	.bus_width = 0,
 	.zq = CONFIG_DRAM_ZQ,
-	.odt_en = 0,
+	.odt_en = CONFIG_DRAM_ODT_EN,
 	.size = 0,
 #ifdef CONFIG_DRAM_TIMINGS_VENDOR_MAGIC
 	.cas = 6,
@@ -19,12 +19,14 @@ static struct dram_para dram_para = {
 	.emr2 = 0,
 #else
 #	include "dram_timings_sun4i.h"
+	.active_windowing = 1,
 #endif
-	.tpr3 = 0,
+	.tpr3 = CONFIG_DRAM_TPR3,
 	.tpr4 = 0,
 	.tpr5 = 0,
 	.emr1 = CONFIG_DRAM_EMR1,
 	.emr3 = 0,
+	.dqs_gating_delay = CONFIG_DRAM_DQS_GATING_DELAY,
 };
 
 unsigned long sunxi_dram_init(void)

board/sunxi/dram_sun5i_auto.c

@@ -5,13 +5,14 @@
 
 static struct dram_para dram_para = {
 	.clock = CONFIG_DRAM_CLK,
+	.mbus_clock = CONFIG_DRAM_MBUS_CLK,
 	.type = 3,
 	.rank_num = 1,
 	.density = 0,
 	.io_width = 0,
 	.bus_width = 0,
 	.zq = CONFIG_DRAM_ZQ,
-	.odt_en = 0,
+	.odt_en = CONFIG_DRAM_ODT_EN,
 	.size = 0,
 #ifdef CONFIG_DRAM_TIMINGS_VENDOR_MAGIC
 	.cas = 9,
@@ -21,12 +22,14 @@ static struct dram_para dram_para = {
 	.emr2 = 0x10,
 #else
 #	include "dram_timings_sun4i.h"
+	.active_windowing = 1,
 #endif
 	.tpr3 = 0,
 	.tpr4 = 0,
 	.tpr5 = 0,
 	.emr1 = CONFIG_DRAM_EMR1,
 	.emr3 = 0,
+	.dqs_gating_delay = CONFIG_DRAM_DQS_GATING_DELAY,
 };
 
 unsigned long sunxi_dram_init(void)