From ddd594b03ea7209f1b17b1ce918e585c48bd1df8 Mon Sep 17 00:00:00 2001
From: Tomasz Moń <desowin@gmail.com>
Date: Thu, 15 Dec 2011 15:33:53 +0000
Subject: Sansa Connect: Use sleep() instead udelay() in AVR spi_txrx.

This should prevent buffer underruns that can occur during heavy use of buttons or scrollwheel.



git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31267 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.c  | 8 ++++----
 firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.h  | 1 +
 firmware/target/arm/tms320dm320/sansa-connect/lcd-sansaconnect.c  | 1 +
 .../target/arm/tms320dm320/sansa-connect/power-sansaconnect.c     | 3 +++
 firmware/target/arm/tms320dm320/sdmmc-dm320.c                     | 6 +++---
 firmware/target/arm/tms320dm320/system-dm320.c                    | 7 ++++++-
 6 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.c b/firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.c
index dedd017cf7..2ed69b6c9b 100644
--- a/firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.c
+++ b/firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.c
@@ -228,7 +228,9 @@ static void spi_txrx(unsigned char *buf_tx, unsigned char *buf_rx, int n)
     for (i = 0; i<n; i++)
     {
         IO_SERIAL1_TX_DATA = buf_tx[i];
-        udelay(100);
+
+        /* a short wait for AVR to process data */
+        sleep(HZ/1000);
 
         do
         {
@@ -248,7 +250,7 @@ static void spi_txrx(unsigned char *buf_tx, unsigned char *buf_rx, int n)
     mutex_unlock(&avr_mtx);
 }
 
-static void avr_hid_sync(void)
+void avr_hid_sync(void)
 {
     int i;
     unsigned char prg[4] = {CMD_SYNC, CMD_VER, CMD_FILL, CMD_CLOSE};
@@ -279,8 +281,6 @@ void avr_hid_init(void)
     IO_SERIAL1_MODE = 0x6DB;
 
     mutex_init(&avr_mtx);
-
-    avr_hid_sync();
 }
 
 /* defined in powermgmt-sansaconnect.c */
diff --git a/firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.h b/firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.h
index 64b44675f7..06fd2b2d72 100644
--- a/firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.h
+++ b/firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.h
@@ -24,6 +24,7 @@
 
 #include "config.h"
 
+void avr_hid_sync(void);
 void avr_hid_init(void);
 
 void avr_hid_enable_charger(void);
diff --git a/firmware/target/arm/tms320dm320/sansa-connect/lcd-sansaconnect.c b/firmware/target/arm/tms320dm320/sansa-connect/lcd-sansaconnect.c
index fcfc82e876..e53a15e94f 100644
--- a/firmware/target/arm/tms320dm320/sansa-connect/lcd-sansaconnect.c
+++ b/firmware/target/arm/tms320dm320/sansa-connect/lcd-sansaconnect.c
@@ -133,6 +133,7 @@ void lcd_init_device(void)
     /* Copy Rockbox frame buffer to the second framebuffer */
     lcd_update();
 
+    avr_hid_sync();
     avr_hid_lcm_power_on();
 
     /* set framebuffer address - OF sets RAM start address to 0x1000000 */
diff --git a/firmware/target/arm/tms320dm320/sansa-connect/power-sansaconnect.c b/firmware/target/arm/tms320dm320/sansa-connect/power-sansaconnect.c
index f73df98641..ecdf3b1a75 100644
--- a/firmware/target/arm/tms320dm320/sansa-connect/power-sansaconnect.c
+++ b/firmware/target/arm/tms320dm320/sansa-connect/power-sansaconnect.c
@@ -60,6 +60,9 @@ void power_init(void)
 
     /* Set LCM (LDO1) to 2.85V, Set CODEC and USB (LDO2) to 1.8V */
     tps65021_write_reg(0x08, 0x36);
+
+    /* Enable internal charger */
+    avr_hid_enable_charger();
 }
 
 void power_off(void)
diff --git a/firmware/target/arm/tms320dm320/sdmmc-dm320.c b/firmware/target/arm/tms320dm320/sdmmc-dm320.c
index 7df2925e20..6c744755f2 100644
--- a/firmware/target/arm/tms320dm320/sdmmc-dm320.c
+++ b/firmware/target/arm/tms320dm320/sdmmc-dm320.c
@@ -891,9 +891,9 @@ int sd_init(void)
     bitclr16(&IO_CLK_MOD2, CLK_MOD2_MMC);
     bitset16(&IO_CLK_INV, CLK_INV_MMC);
 
-    /* mmc module clock: 75 Mhz (AHB) / 2 = ~37.5 Mhz */
-    /* OF uses 1, but for some reason it freezes on us */
-    IO_CLK_DIV3 = (IO_CLK_DIV3 & 0xFF00) | 0x02;
+    /* mmc module clock: 75 Mhz (AHB) / 2 = ~37.5 Mhz
+     * (Frequencies above are taken from Sansa Connect's OF source code) */
+    IO_CLK_DIV3 = (IO_CLK_DIV3 & 0xFF00) | 0x01;
 
     bitset16(&IO_CLK_MOD2, CLK_MOD2_MMC);
 
diff --git a/firmware/target/arm/tms320dm320/system-dm320.c b/firmware/target/arm/tms320dm320/system-dm320.c
index 37d06f4343..abdca21627 100644
--- a/firmware/target/arm/tms320dm320/system-dm320.c
+++ b/firmware/target/arm/tms320dm320/system-dm320.c
@@ -310,6 +310,11 @@ void system_init(void)
     else
 #endif
     {
+#ifdef SANSA_CONNECT
+        /* Setting AHB divisor to 0 causes MMC/SD interface to lock */
+        clock_arm_slow = (1 << 8) | 3;
+        clock_arm_fast = (1 << 8) | 1;
+#else
         /* Set the slow and fast clock speeds used for boosting
          * Slow Setup:
          *  ARM div  = 4    ( 87.5 MHz )
@@ -320,6 +325,7 @@ void system_init(void)
          */
         clock_arm_slow = (0 << 8) | 3;
         clock_arm_fast = (1 << 8) | 1;
+#endif
     }
 
     /* M48XI disabled, USB buffer powerdown */
@@ -368,7 +374,6 @@ void system_init(void)
 
     i2c_init();
     avr_hid_init();
-    avr_hid_enable_charger();
 #endif
 }
 
-- 
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