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serial: 8250_omap: refactor mdr1 update

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The silicon errata[1] workaround implemented in a follow-on
patch, "serial: 8250_omap: workaround errata on disabling
UART after using DMA", requires MDR1 register programming.

Extract MDR1 register update into helper function,
omap8250_update_mdr1() to help with that.

[1] Advisory 21 in http://www.ti.com/lit/er/sprz408b/sprz408b.pdf

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sekhar Nori 2015-07-14 13:32:05 +05:30 committed by Greg Kroah-Hartman
parent d879aeaa41
commit 6f03541f6b
1 changed files with 12 additions and 5 deletions
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17
drivers/tty/serial/8250/8250_omap.c
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@ -232,6 +232,15 @@ static void omap8250_update_scr(struct uart_8250_port *up,
serial_out(up, UART_OMAP_SCR, priv->scr);
}
static void omap8250_update_mdr1(struct uart_8250_port *up,
struct omap8250_priv *priv)
{
if (priv->habit & UART_ERRATA_i202_MDR1_ACCESS)
omap_8250_mdr1_errataset(up, priv);
else
serial_out(up, UART_OMAP_MDR1, priv->mdr1);
}
static void omap8250_restore_regs(struct uart_8250_port *up)
{
struct omap8250_priv *priv = up->port.private_data;
@ -282,11 +291,9 @@ static void omap8250_restore_regs(struct uart_8250_port *up)
serial_out(up, UART_XOFF1, priv->xoff);
serial_out(up, UART_LCR, up->lcr);
/* need mode A for FCR */
if (priv->habit & UART_ERRATA_i202_MDR1_ACCESS)
omap_8250_mdr1_errataset(up, priv);
else
serial_out(up, UART_OMAP_MDR1, priv->mdr1);
omap8250_update_mdr1(up, priv);
up->port.ops->set_mctrl(&up->port, up->port.mctrl);
}