Revert "tty: serial: OMAP: ensure FIFO levels are set correctly in non-DMA mode"

This reverts commit 0a697b22252c9d7208b5fb3e9fbd124dd229f1d2 as Paul
wants to rework it.

Cc: Paul Walmsley <paul@pwsan.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Govindraj Raja <govindraj.r@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/tty/serial/omap-serial.c

@@ -46,18 +46,6 @@
 
 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/
 
-/* SCR register bitmasks */
-#define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK		(1 << 7)
-#define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK		(1 << 6)
-
-/* FCR register bitmasks */
-#define OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT		6
-#define OMAP_UART_FCR_RX_FIFO_TRIG_MASK			(0x3 << 6)
-#define OMAP_UART_FCR_TX_FIFO_TRIG_SHIFT		4
-
-/* TLR register bitmasks */
-#define OMAP_UART_TLR_TX_FIFO_TRIG_DMA_SHIFT		0
-
 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
 
 /* Forward declaration of functions */
@@ -706,7 +694,6 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
 	unsigned char efr = 0;
 	unsigned long flags = 0;
 	unsigned int baud, quot;
-	u32 tlr;
 
 	switch (termios->c_cflag & CSIZE) {
 	case CS5:
@@ -824,28 +811,14 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
 	up->mcr = serial_in(up, UART_MCR);
 	serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
 	/* FIFO ENABLE, DMA MODE */
-
-	up->scr |= OMAP_UART_SCR_TX_TRIG_GRANU1_MASK;
-	up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
+	serial_out(up, UART_FCR, up->fcr);
+	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
 
 	if (up->use_dma) {
-		tlr = 0;
-	} else {
-		up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
-
-		/* Set receive FIFO threshold to 1 */
-		up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
-		up->fcr |= (0x1 << OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT);
-
-		/* Set TX FIFO threshold to "63" (actually 1) */
-		up->fcr |= (0x3 << OMAP_UART_FCR_TX_FIFO_TRIG_SHIFT);
-		tlr = (0xf << OMAP_UART_TLR_TX_FIFO_TRIG_DMA_SHIFT);
+		serial_out(up, UART_TI752_TLR, 0);
+		up->scr |= (UART_FCR_TRIGGER_4 | UART_FCR_TRIGGER_8);
 	}
 
-	serial_out(up, UART_TI752_TLR, tlr);
-	serial_out(up, UART_FCR, up->fcr);
-	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
-
 	serial_out(up, UART_OMAP_SCR, up->scr);
 
 	serial_out(up, UART_EFR, up->efr);