diff options
| author | Laxman Dewangan <ldewangan@nvidia.com> | 2010-06-28 22:32:04 +0530 |
|---|---|---|
| committer | Gary King <gking@nvidia.com> | 2010-07-09 09:48:49 -0700 |
| commit | dcea9bbb855b9fcb34371ff4d021d5095adb5d4a (patch) | |
| tree | dc58545d7d6ee148b4484e68b6aa49f9401544bf /drivers | |
| parent | 2a63e51b5ede608a2f6cc20f31c55e660b5b2ce9 (diff) | |
[arm/tegra] serial: Enabling hw based rts control.
Tegra arch2x have the capability to control the rts line based on
data available in the rx fifo. If data vaiable in rx fifo is equal
to the rx trigger level then rts become inactive by the controller.
Once the data read from fifo either by cpu or by the dma, the rts
become active by hw.
Change-Id: I67a52ea105973e9ca21a4cc08f0fb1e3234a7d55
Reviewed-on: http://git-master/r/3299
Reviewed-by: Gary King <gking@nvidia.com>
Tested-by: Laxman Dewangan <ldewangan@nvidia.com>
Diffstat (limited to 'drivers')
| -rwxr-xr-x | drivers/serial/tegra_hsuart.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/serial/tegra_hsuart.c b/drivers/serial/tegra_hsuart.c index 6162f306212d..fc4dd8c7d791 100755 --- a/drivers/serial/tegra_hsuart.c +++ b/drivers/serial/tegra_hsuart.c @@ -815,9 +815,10 @@ static void set_rts(struct tegra_uart_port *t, bool active) unsigned char mcr; mcr = t->mcr_shadow; if (active) - mcr |= UART_MCR_RTS; + mcr |= UART_MCR_RTS_EN; else - mcr &= ~UART_MCR_RTS; + mcr &= ~UART_MCR_RTS_EN; + if (mcr != t->mcr_shadow) { uart_writeb(t, mcr, UART_MCR); t->mcr_shadow = mcr; |