diff options
| author | Krishna Yarlagadda <kyarlagadda@nvidia.com> | 2019-09-04 10:13:03 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-05 10:00:05 +0200 |
| commit | 7799a3aa81279637031abad19e56e4bbf1481d4e (patch) | |
| tree | b2f9c08d42044819c1ddeb72622b3b27b83a4032 /drivers/tty/serial | |
| parent | 53d0a062cb771d62cd205d9e2845fe26c9989142 (diff) | |
serial: tegra: add support to use 8 bytes trigger
Add support to use 8 bytes trigger for Tegra186 SOC.
Signed-off-by: Shardar Shariff Md <smohammed@nvidia.com>
Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
Link: https://lore.kernel.org/r/1567572187-29820-9-git-send-email-kyarlagadda@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial')
| -rw-r--r-- | drivers/tty/serial/serial-tegra.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index 8422516a2afd..02f85353d720 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -88,6 +88,7 @@ struct tegra_uart_chip_data { bool support_clk_src_div; bool fifo_mode_enable_status; int uart_max_port; + int max_dma_burst_bytes; }; struct tegra_uart_port { @@ -931,7 +932,12 @@ static int tegra_uart_hw_init(struct tegra_uart_port *tup) * programmed in the DMA registers. */ tup->fcr_shadow = UART_FCR_ENABLE_FIFO; - tup->fcr_shadow |= UART_FCR_R_TRIG_01; + + if (tup->cdata->max_dma_burst_bytes == 8) + tup->fcr_shadow |= UART_FCR_R_TRIG_10; + else + tup->fcr_shadow |= UART_FCR_R_TRIG_01; + tup->fcr_shadow |= TEGRA_UART_TX_TRIG_16B; tegra_uart_write(tup, tup->fcr_shadow, UART_FCR); @@ -1045,7 +1051,7 @@ static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup, } dma_sconfig.src_addr = tup->uport.mapbase; dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; - dma_sconfig.src_maxburst = 4; + dma_sconfig.src_maxburst = tup->cdata->max_dma_burst_bytes; tup->rx_dma_chan = dma_chan; tup->rx_dma_buf_virt = dma_buf; tup->rx_dma_buf_phys = dma_phys; @@ -1324,6 +1330,7 @@ static struct tegra_uart_chip_data tegra20_uart_chip_data = { .support_clk_src_div = false, .fifo_mode_enable_status = false, .uart_max_port = 5, + .max_dma_burst_bytes = 4, }; static struct tegra_uart_chip_data tegra30_uart_chip_data = { @@ -1332,6 +1339,7 @@ static struct tegra_uart_chip_data tegra30_uart_chip_data = { .support_clk_src_div = true, .fifo_mode_enable_status = false, .uart_max_port = 5, + .max_dma_burst_bytes = 4, }; static struct tegra_uart_chip_data tegra186_uart_chip_data = { @@ -1340,6 +1348,7 @@ static struct tegra_uart_chip_data tegra186_uart_chip_data = { .support_clk_src_div = true, .fifo_mode_enable_status = true, .uart_max_port = 8, + .max_dma_burst_bytes = 8, }; static const struct of_device_id tegra_uart_of_match[] = { |