From 9a5a0dc9ff4086a295832709c609276512f54743 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Fri, 4 Oct 2013 03:14:02 +0300
Subject: [PATCH] gp2x: pollux: bring back ram timings

---
 gp2x/pollux_set.c | 15 +++++++++++++++
 gp2x/pollux_set.h |  2 ++
 gp2x/soc_pollux.c | 29 +++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+)

diff --git a/gp2x/pollux_set.c b/gp2x/pollux_set.c
index 9781c82..0af6468 100644
--- a/gp2x/pollux_set.c
+++ b/gp2x/pollux_set.c
@@ -337,6 +337,21 @@ again:
 	return 0;
 }
 
+int pollux_set_fromenv(volatile unsigned short *memregs,
+	const char *env_var)
+{
+	const char *set_string;
+	int ret = -1;
+
+	set_string = getenv(env_var);
+	if (set_string)
+		ret = pollux_set(memregs, set_string);
+	else
+		printf("env var %s not defined.\n", env_var);
+
+	return ret;
+}
+
 #ifdef BINARY
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/gp2x/pollux_set.h b/gp2x/pollux_set.h
index 64bb220..42aa9ba 100644
--- a/gp2x/pollux_set.h
+++ b/gp2x/pollux_set.h
@@ -4,6 +4,8 @@ extern "C"
 #endif
 
 int pollux_set(volatile unsigned short *memregs, const char *str);
+int pollux_set_fromenv(volatile unsigned short *memregs,
+	const char *env_var);
 
 #ifdef __cplusplus
 }
diff --git a/gp2x/soc_pollux.c b/gp2x/soc_pollux.c
index bbccede..5b0b3ff 100644
--- a/gp2x/soc_pollux.c
+++ b/gp2x/soc_pollux.c
@@ -29,10 +29,12 @@
 
 #include "soc.h"
 #include "plat_gp2x.h"
+#include "pollux_set.h"
 #include "../plat.h"
 
 static int battdev = -1, mixerdev = -1;
 static int cpu_clock_allowed;
+static unsigned short saved_memtimex[2];
 static unsigned int saved_video_regs[2][6];
 static unsigned int timer_drift; // count per real second
 
@@ -59,6 +61,26 @@ static int decode_pll(unsigned int reg)
 	return v;
 }
 
+/* RAM timings */
+static void set_ram_timings(void)
+{
+	pollux_set_fromenv(memregs, "POLLUX_RAM_TIMINGS");
+}
+
+static void unset_ram_timings(void)
+{
+	int i;
+
+	memregs[0x14802>>1] = saved_memtimex[0];
+	memregs[0x14804>>1] = saved_memtimex[1] | 0x8000;
+
+	for (i = 0; i < 0x100000; i++)
+		if (!(memregs[0x14804>>1] & 0x8000))
+			break;
+
+	printf("RAM timings reset to startup values.\n");
+}
+
 #define TIMER_BASE3 0x1980
 #define TIMER_REG(x) memregl[(TIMER_BASE3 + x) >> 2]
 
@@ -235,6 +257,11 @@ void pollux_init(void)
 	}
 	memregl = (volatile void *)memregs;
 
+	saved_memtimex[0] = memregs[0x14802>>1];
+	saved_memtimex[1] = memregs[0x14804>>1];
+
+	set_ram_timings();
+
 	// save video regs of both MLCs
 	save_multiple_regs(saved_video_regs[0], 0x4058, ARRAY_SIZE(saved_video_regs[0]));
 	save_multiple_regs(saved_video_regs[1], 0x4458, ARRAY_SIZE(saved_video_regs[1]));
@@ -305,6 +332,8 @@ void pollux_finish(void)
 {
 	timer_cleanup();
 
+	unset_ram_timings();
+
 	restore_multiple_regs(0x4058, saved_video_regs[0],
 		ARRAY_SIZE(saved_video_regs[0]));
 	restore_multiple_regs(0x4458, saved_video_regs[1],
-- 
2.39.2