Commit 1f47a77c authored by Heikki Krogerus's avatar Heikki Krogerus Committed by Rafael J. Wysocki
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ACPI / LPSS: not using UART RTS override with Auto Flow Control 



Adding a check for UART Auto Flow Control feature and only
enabling the RTS override when it's not supported. RTS
override is not needed when Auto Flow Control is used and
they shouldn't be used together.

Signed-off-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 871dd05c

drivers/acpi/acpi_lpss.c

+15 −7
Original line number Diff line number Diff line
@@ -83,18 +83,26 @@ struct lpss_private_data { 
	u32 prv_reg_ctx[LPSS_PRV_REG_COUNT];

};



/* UART Component Parameter Register */

#define LPSS_UART_CPR			0xF4

#define LPSS_UART_CPR_AFCE		BIT(4)



static void lpss_uart_setup(struct lpss_private_data *pdata)

{

	unsigned int offset;

	u32 reg;

	u32 val;



	offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;

	reg = readl(pdata->mmio_base + offset);

	writel(reg | LPSS_TX_INT_MASK, pdata->mmio_base + offset);

	val = readl(pdata->mmio_base + offset);

	writel(val | LPSS_TX_INT_MASK, pdata->mmio_base + offset);



	val = readl(pdata->mmio_base + LPSS_UART_CPR);

	if (!(val & LPSS_UART_CPR_AFCE)) {

		offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;

	reg = readl(pdata->mmio_base + offset);

	writel(reg | LPSS_GENERAL_UART_RTS_OVRD, pdata->mmio_base + offset);

		val = readl(pdata->mmio_base + offset);

		val |= LPSS_GENERAL_UART_RTS_OVRD;

		writel(val, pdata->mmio_base + offset);

	}

}



static void byt_i2c_setup(struct lpss_private_data *pdata)

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