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tty: serial: tegra: Optimize DMA buffer synchronization 

Synchronize only the dirty part of DMA buffer in order to avoid
unnecessary overhead of syncing of the clean part, which is the case
of every serial DMA transfer in practice.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20200112180919.5194-3-digetx@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Osipenko 2020-01-12 21:09:19 +03:00 committed by Greg Kroah-Hartman
parent d5e3fadb70
commit 5c116fdf56
1 changed files with 9 additions and 7 deletions
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16
drivers/tty/serial/serial-tegra.c
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@ -534,11 +534,12 @@ static int tegra_uart_start_tx_dma(struct tegra_uart_port *tup,
struct circ_buf *xmit = &tup->uport.state->xmit;
dma_addr_t tx_phys_addr;
dma_sync_single_for_device(tup->uport.dev, tup->tx_dma_buf_phys,
UART_XMIT_SIZE, DMA_TO_DEVICE);
tup->tx_bytes = count & ~(0xF);
tx_phys_addr = tup->tx_dma_buf_phys + xmit->tail;
dma_sync_single_for_device(tup->uport.dev, tx_phys_addr,
tup->tx_bytes, DMA_TO_DEVICE);
tup->tx_dma_desc = dmaengine_prep_slave_single(tup->tx_dma_chan,
tx_phys_addr, tup->tx_bytes, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT);
@ -680,7 +681,7 @@ static void tegra_uart_copy_rx_to_tty(struct tegra_uart_port *tup,
return;
dma_sync_single_for_cpu(tup->uport.dev, tup->rx_dma_buf_phys,
TEGRA_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
count, DMA_FROM_DEVICE);
copied = tty_insert_flip_string(tty,
((unsigned char *)(tup->rx_dma_buf_virt)), count);
if (copied != count) {
@ -688,7 +689,7 @@ static void tegra_uart_copy_rx_to_tty(struct tegra_uart_port *tup,
dev_err(tup->uport.dev, "RxData copy to tty layer failed\n");
}
dma_sync_single_for_device(tup->uport.dev, tup->rx_dma_buf_phys,
TEGRA_UART_RX_DMA_BUFFER_SIZE, DMA_TO_DEVICE);
count, DMA_TO_DEVICE);
}
static void tegra_uart_rx_buffer_push(struct tegra_uart_port *tup,
@ -788,8 +789,6 @@ static int tegra_uart_start_rx_dma(struct tegra_uart_port *tup)
tup->rx_dma_active = true;
tup->rx_dma_desc->callback = tegra_uart_rx_dma_complete;
tup->rx_dma_desc->callback_param = tup;
dma_sync_single_for_device(tup->uport.dev, tup->rx_dma_buf_phys,
count, DMA_TO_DEVICE);
tup->rx_bytes_requested = count;
tup->rx_cookie = dmaengine_submit(tup->rx_dma_desc);
dma_async_issue_pending(tup->rx_dma_chan);
@ -1154,6 +1153,9 @@ static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup,
dma_release_channel(dma_chan);
return -ENOMEM;
}
dma_sync_single_for_device(tup->uport.dev, dma_phys,
TEGRA_UART_RX_DMA_BUFFER_SIZE,
DMA_TO_DEVICE);
dma_sconfig.src_addr = tup->uport.mapbase;
dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
dma_sconfig.src_maxburst = tup->cdata->max_dma_burst_bytes;