From 2275c67607418566594fa451b8503af1df82e903 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Thu, 23 Jul 2009 19:10:33 +0000
Subject: [PATCH] restore some hw regs on exit to startup values

git-svn-id: file:///home/notaz/opt/svn/PicoDrive@709 be3aeb3a-fb24-0410-a615-afba39da0efa
---
 platform/gp2x/plat.c       |  1 -
 platform/gp2x/soc_mmsp2.c  | 33 ++++++++++++++++++++++++---------
 platform/gp2x/soc_pollux.c | 24 ++++++++++++++++++------
 3 files changed, 42 insertions(+), 16 deletions(-)

diff --git a/platform/gp2x/plat.c b/platform/gp2x/plat.c
index c2dce2db..568d3632 100644
--- a/platform/gp2x/plat.c
+++ b/platform/gp2x/plat.c
@@ -181,7 +181,6 @@ void plat_finish(void)
 		break;
 	}
 
-	gp2x_video_changemode(16);
 	sndout_oss_exit();
 }
 
diff --git a/platform/gp2x/soc_mmsp2.c b/platform/gp2x/soc_mmsp2.c
index c1362872..d6c40e5b 100644
--- a/platform/gp2x/soc_mmsp2.c
+++ b/platform/gp2x/soc_mmsp2.c
@@ -33,7 +33,12 @@ static int touchcal[7] = { 6203, 0, -1501397, 0, -4200, 16132680, 65536 };
 
 static const int gp2x_screenaddrs[4] = { FRAMEBUFF_ADDR0, FRAMEBUFF_ADDR1, FRAMEBUFF_ADDR2, FRAMEBUFF_ADDR3 };
 static int gp2x_screenaddrs_use[4];
+
+static char gamma_was_changed = 0;
+static char cpuclk_was_changed = 0;
 static unsigned short gp2x_screenaddr_old[4];
+static unsigned short memtimex_old[2];
+static unsigned short reg0910;
 
 
 /* video stuff */
@@ -166,11 +171,11 @@ static void gp2x_set_cpuclk_(unsigned int mhz)
 	for (i = 0; i < 10000; i++)
 		if (!(gp2x_memregs[0x902>>1] & 1))
 			break;
+
+	cpuclk_was_changed = 1;
 }
 
 /* RAM timings */
-static unsigned short memtimex[2];
-
 #define TIMING_CHECK(t, adj, mask) \
 	t += adj; \
 	if (t & ~mask) \
@@ -214,8 +219,8 @@ static void set_ram_timings_(void)
 
 static void unset_ram_timings_(void)
 {
-	gp2x_memregs[0x3802>>1] = memtimex[0];
-	gp2x_memregs[0x3804>>1] = memtimex[1] | 0x8000;
+	gp2x_memregs[0x3802>>1] = memtimex_old[0];
+	gp2x_memregs[0x3804>>1] = memtimex_old[1] | 0x8000;
 	printf("RAM timings reset to startup values.\n");
 }
 
@@ -344,6 +349,8 @@ static void set_lcd_gamma_(int g100, int A_SNs_curve)
 		gp2x_memregs[0x295E>>1]= s;
 		gp2x_memregs[0x295E>>1]= g;
 	}
+
+	gamma_was_changed = 1;
 }
 
 
@@ -454,12 +461,13 @@ void mmsp2_init(void)
 
 	memcpy(gp2x_screenaddrs_use, gp2x_screenaddrs, sizeof(gp2x_screenaddrs));
 
-	/* default LCD refresh */
+	/* save startup values: LCD refresh */
 	get_reg_setting(lcd_rate_defaults);
 
-	/* RAM timings */
-	memtimex[0] = gp2x_memregs[0x3802>>1];
-	memtimex[1] = gp2x_memregs[0x3804>>1];
+	/* CPU and RAM timings */
+	reg0910 = gp2x_memregs[0x0910>>1];
+	memtimex_old[0] = gp2x_memregs[0x3802>>1];
+	memtimex_old[1] = gp2x_memregs[0x3804>>1];
 
 	/* touchscreen */
 	touchdev = open("/dev/touchscreen/wm97xx", O_RDONLY);
@@ -503,13 +511,20 @@ void mmsp2_finish(void)
 	pause940(1);
 	sharedmem940_finish();
 
+	gp2x_video_RGB_setscaling_(0, 320, 240);
+	gp2x_video_changemode_ll_(16);
+
 	gp2x_memregs[0x290E>>1] = gp2x_screenaddr_old[0];
 	gp2x_memregs[0x2910>>1] = gp2x_screenaddr_old[1];
 	gp2x_memregs[0x2912>>1] = gp2x_screenaddr_old[2];
 	gp2x_memregs[0x2914>>1] = gp2x_screenaddr_old[3];
 
-	unset_ram_timings_();
 	unset_lcd_custom_rate_();
+	if (gamma_was_changed)
+		set_lcd_gamma_(100, 0);
+	unset_ram_timings_();
+	if (cpuclk_was_changed)
+		gp2x_memregs[0x910>>1] = reg0910;
 
 	munmap(gp2x_screens[0], FRAMEBUFF_WHOLESIZE);
 	munmap((void *)gp2x_memregs, 0x10000);
diff --git a/platform/gp2x/soc_pollux.c b/platform/gp2x/soc_pollux.c
index fb7e66fd..6bea3173 100644
--- a/platform/gp2x/soc_pollux.c
+++ b/platform/gp2x/soc_pollux.c
@@ -27,6 +27,10 @@ static unsigned int fb_paddr[fb_buf_count];
 static int fb_work_buf;
 static int fbdev = -1;
 
+static char cpuclk_was_changed = 0;
+static unsigned short memtimex_old[2];
+static unsigned int pllsetreg0;
+
 
 /* video stuff */
 static void pollux_video_flip(int buf_count)
@@ -110,6 +114,8 @@ static void gp2x_set_cpuclk_(unsigned int mhz)
 	char buff[24];
 	snprintf(buff, sizeof(buff), "cpuclk=%u", mhz);
 	pollux_set(memregs, buff);
+
+	cpuclk_was_changed = 1;
 }
 
 /* misc */
@@ -124,8 +130,6 @@ static void pollux_set_fromenv(const char *env_var)
 }
 
 /* RAM timings */
-static unsigned short memtimex[2];
-
 static void set_ram_timings_(void)
 {
 	pollux_set_fromenv("POLLUX_RAM_TIMINGS");
@@ -135,8 +139,8 @@ static void unset_ram_timings_(void)
 {
 	int i;
 
-	memregs[0x14802>>1] = memtimex[0];
-	memregs[0x14804>>1] = memtimex[1] | 0x8000;
+	memregs[0x14802>>1] = memtimex_old[0];
+	memregs[0x14804>>1] = memtimex_old[1] | 0x8000;
 
 	for (i = 0; i < 0x100000; i++)
 		if (!(memregs[0x14804>>1] & 0x8000))
@@ -215,8 +219,9 @@ void pollux_init(void)
 	fb_work_buf = 0;
 	g_screen_ptr = gp2x_screens[0];
 
-	memtimex[0] = memregs[0x14802>>1];
-	memtimex[1] = memregs[0x14804>>1];
+	pllsetreg0 = memregl[0xf004];
+	memtimex_old[0] = memregs[0x14802>>1];
+	memtimex_old[1] = memregs[0x14804>>1];
 
 	gp2x_video_flip = gp2x_video_flip_;
 	gp2x_video_flip2 = gp2x_video_flip2_;
@@ -243,6 +248,13 @@ void pollux_finish(void)
 //	wiz_lcd_set_portrait(0);
 	close(fbdev);
 
+	gp2x_video_changemode_ll_(16);
+	unset_ram_timings_();
+	if (cpuclk_was_changed) {
+		memregl[0xf004>>2] = pllsetreg0;
+		memregl[0xf07c>>2] |= 0x8000;
+	}
+
 	munmap((void *)memregs, 0x20000);
 	close(memdev);
 }
-- 
2.39.5