fuze+: make sure lcd is ready before chaning a register

The lcd driver does not wait for the refresh to be done to return
from lcd_update(). This means that changing a register is unsafe
if done in the middle of the redraw. This could happen when
disabling the lcd for example. Make sure it doesn't happen by
waiting for the lcdif to be ready.

Change-Id: I43ec62a637dd61c3b2a3a6e131c1a9e8035524b1

1 files changed, 1 insertions, 0 deletions

diff --git a/firmware/target/arm/imx233/sansa-fuzeplus/lcd-fuzeplus.c b/firmware/target/arm/imx233/sansa-fuzeplus/lcd-fuzeplus.c
index 85ab6cd365..9997deb270 100644
--- a/firmware/target/arm/imx233/sansa-fuzeplus/lcd-fuzeplus.c
+++ b/firmware/target/arm/imx233/sansa-fuzeplus/lcd-fuzeplus.c
@@ -208,6 +208,7 @@ static uint32_t i80_read_register(uint32_t data_out)
 static void lcd_write_reg(uint32_t reg, uint32_t data)
 {
     uint32_t old_reg = reg;
+    imx233_lcdif_wait_ready();
     /* get back to 18-bit word length */
     imx233_lcdif_set_word_length(HW_LCDIF_CTRL__WORD_LENGTH_18_BIT);
     reg = encode_16_to_18(reg);