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serial: 8250_mtk: Make sure to select the right FEATURE_SEL

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Set the FEATURE_SEL at probe time to make sure that BIT(0) is enabled:
this guarantees that when the port is configured as AP UART, the
right register layout is interpreted by the UART IP.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20220427132328.228297-3-angelogioacchino.delregno@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
AngeloGioacchino Del Regno 2022-04-27 15:23:27 +02:00 committed by Greg Kroah-Hartman
parent bb0b197aad
commit 6f81fdded0
1 changed files with 7 additions and 0 deletions
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7
drivers/tty/serial/8250/8250_mtk.c
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@ -54,6 +54,9 @@
#define MTK_UART_TX_TRIGGER 1
#define MTK_UART_RX_TRIGGER MTK_UART_RX_SIZE
#define MTK_UART_FEATURE_SEL 39 /* Feature Selection register */
#define MTK_UART_FEAT_NEWRMAP BIT(0) /* Use new register map */
#ifdef CONFIG_SERIAL_8250_DMA
enum dma_rx_status {
DMA_RX_START = 0,
@ -569,6 +572,10 @@ static int mtk8250_probe(struct platform_device *pdev)
uart.dma = data->dma;
#endif
/* Set AP UART new register map */
writel(MTK_UART_FEAT_NEWRMAP, uart.port.membase +
(MTK_UART_FEATURE_SEL << uart.port.regshift));
/* Disable Rate Fix function */
writel(0x0, uart.port.membase +
(MTK_UART_RATE_FIX << uart.port.regshift));