From 144d323485b7957bdc32998d07de9d65cf72dac4 Mon Sep 17 00:00:00 2001
From: jethead71 <jethead71@a1c6a512-1295-4272-9138-f99709370657>
Date: Thu, 26 Jul 2007 10:46:17 +0000
Subject: [PATCH] Reenable scaling on Sansa since a reasonable solution to
 clicks has been found.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13995 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/export/config-e200.h       |  2 +-
 firmware/export/i2s.h               |  1 +
 firmware/target/arm/i2s-pp.c        | 31 +++++++++++++++++++++++++++++++
 firmware/target/arm/pcm-pp.c        |  4 ++--
 firmware/target/arm/system-pp502x.c |  9 +++++++++
 5 files changed, 44 insertions(+), 3 deletions(-)

diff --git a/firmware/export/config-e200.h b/firmware/export/config-e200.h
index c7f058e95..acb23cb4d 100644
--- a/firmware/export/config-e200.h
+++ b/firmware/export/config-e200.h
@@ -160,7 +160,7 @@
 #define CONFIG_LED LED_VIRTUAL
 
 /* Define this if you have adjustable CPU frequency */
-/*#define HAVE_ADJUSTABLE_CPU_FREQ*/
+#define HAVE_ADJUSTABLE_CPU_FREQ
 
 #define MI4_FORMAT
 #define BOOTFILE_EXT    "mi4"
diff --git a/firmware/export/i2s.h b/firmware/export/i2s.h
index 13dba6839..3b4dbb4c1 100644
--- a/firmware/export/i2s.h
+++ b/firmware/export/i2s.h
@@ -18,3 +18,4 @@
  ****************************************************************************/
 
 void i2s_reset(void);
+void i2s_scale_attn_level(long frequency);
diff --git a/firmware/target/arm/i2s-pp.c b/firmware/target/arm/i2s-pp.c
index c63287b72..b9e32b878 100644
--- a/firmware/target/arm/i2s-pp.c
+++ b/firmware/target/arm/i2s-pp.c
@@ -25,6 +25,7 @@
  ****************************************************************************/
 
 #include "system.h"
+#include "cpu.h"
 
 /* TODO: Add in PP5002 defs */
 #if CONFIG_CPU == PP5002
@@ -140,4 +141,34 @@ void i2s_reset(void)
     /* Rx.CLR = 1, TX.CLR = 1 */
     IISFIFO_CFG |= 0x1100;
 }
+
+#ifdef SANSA_E200
+void i2s_scale_attn_level(long frequency)
+{
+    unsigned int iisfifo_cfg = IISFIFO_CFG & ~0xff;
+
+    /* TODO: set this more appropriately for frequency */
+    if (frequency <= CPUFREQ_DEFAULT)
+    {
+        /* when 4 slots full */
+        /* when 4 slots empty */
+        iisfifo_cfg |= 0x11;
+    }
+    else if (frequency < CPUFREQ_MAX)
+    {
+        /* when 8 slots full */
+        /* when 8 slots empty */
+        iisfifo_cfg |= 0x22;
+    }
+    else
+    {
+        /* when 12 slots full */
+        /* when 12 slots empty */
+        iisfifo_cfg |= 0x33;
+    }
+
+    IISFIFO_CFG = iisfifo_cfg;
+}
+#endif /* SANSA_E200 */
+
 #endif
diff --git a/firmware/target/arm/pcm-pp.c b/firmware/target/arm/pcm-pp.c
index 29e527574..5ac15fe00 100644
--- a/firmware/target/arm/pcm-pp.c
+++ b/firmware/target/arm/pcm-pp.c
@@ -378,7 +378,7 @@ void fiq_record(void)
     if (audio_channels == 2) {
         /* RX is stereo */
         while (p_size > 0) {
-            if (FIFO_FREE_COUNT < 8) {
+            if (FIFO_FREE_COUNT < 2) {
                 /* enable interrupt */
                 IISCONFIG |= (1 << 0);
                 goto fiq_record_exit;
@@ -402,7 +402,7 @@ void fiq_record(void)
     else {
         /* RX is left channel mono */
         while (p_size > 0) {
-            if (FIFO_FREE_COUNT < 8) {
+            if (FIFO_FREE_COUNT < 2) {
                 /* enable interrupt */
                 IISCONFIG |= (1 << 0);
                 goto fiq_record_exit;
diff --git a/firmware/target/arm/system-pp502x.c b/firmware/target/arm/system-pp502x.c
index 3011162e4..748e10668 100644
--- a/firmware/target/arm/system-pp502x.c
+++ b/firmware/target/arm/system-pp502x.c
@@ -18,6 +18,7 @@
  ****************************************************************************/
 #include "system.h"
 #include "thread.h"
+#include "i2s.h"
 
 #if NUM_CORES > 1
 struct mutex boostctrl_mtx NOCACHEBSS_ATTR;
@@ -165,6 +166,10 @@ void set_cpu_frequency(long frequency)
         postmult = CPUFREQ_DEFAULT_MULT;
     cpu_frequency = frequency;
 
+#ifdef SANSA_E200
+    i2s_scale_attn_level(CPUFREQ_DEFAULT);
+#endif
+
     unknown2 = inl(0x600060a0);
 
     outl(inl(0x70000020) | (1<<30), 0x70000020);   /* Enable PLL power */
@@ -197,6 +202,10 @@ void set_cpu_frequency(long frequency)
     inl(0x600060a0); /* sync pipeline (?) */
     outl(unknown2, 0x600060a0);
 
+#ifdef SANSA_E200
+    i2s_scale_attn_level(frequency);
+#endif
+
 # if NUM_CORES > 1
     boostctrl_mtx.locked = 0;
 # endif
-- 
2.11.4.GIT