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serial: ns16550: Simplify poll out

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Simplify poll_out loop.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
This commit is contained in:
Flavio Ceolin 2020-06-16 14:45:16 -07:00 • committed by Carles Cufí
commit 1cd5578539
1 changed files with 3 additions and 9 deletions
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12
drivers/serial/uart_ns16550.c
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@ -539,17 +539,11 @@ static void uart_ns16550_poll_out(struct device *dev,
{ {
k_spinlock_key_t key = k_spin_lock(&DEV_DATA(dev)->lock); k_spinlock_key_t key = k_spin_lock(&DEV_DATA(dev)->lock);
while (1) { while ((INBYTE(LSR(dev)) & LSR_THRE) == 0) {
/* wait for transmitter to ready to accept a character */
if ((INBYTE(LSR(dev)) & LSR_THRE) == 0) {
continue;
}
OUTBYTE(THR(dev), c);
break;
} }
OUTBYTE(THR(dev), c);
k_spin_unlock(&DEV_DATA(dev)->lock, key); k_spin_unlock(&DEV_DATA(dev)->lock, key);
} }