Coldfire: Fix alpha bitmap drawing from messing up the emac status register.

It failed to restore macsr to the expected default (FRAC/SAT) which caused DSP
functions like tone control filter calculation to fail (resulting in noise).
The FFT plugin was also affected.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31589 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 4 insertions, 0 deletions

diff --git a/firmware/target/coldfire/iaudio/x5/lcd-x5.c b/firmware/target/coldfire/iaudio/x5/lcd-x5.c
index e1504b6e98..19b0725ce4 100644
--- a/firmware/target/coldfire/iaudio/x5/lcd-x5.c
+++ b/firmware/target/coldfire/iaudio/x5/lcd-x5.c
@@ -451,7 +451,9 @@ void lcd_blit_yuv(unsigned char * const src[3],
     vsrc = src[2] + (src_y * stride >> 2) + (src_x >> 1);
     ysrc_max = ysrc + height * stride;
 
+    unsigned long macsr = coldfire_get_macsr();
     coldfire_set_macsr(EMAC_SATURATE);
+
     do
     {
         lcd_write_reg(R_HORIZ_RAM_ADDR_POS, ((y + y_offset + 1) << 8) | (y + y_offset));
@@ -470,6 +472,8 @@ void lcd_blit_yuv(unsigned char * const src[3],
         vsrc += stride >> 1;
     }
     while (ysrc < ysrc_max);
+
+    coldfire_set_macsr(macsr);
 } /* lcd_yuv_blit */