Commit 16274d7e authored by Mukesh Ojha's avatar Mukesh Ojha Committed by Jassi Brar
Browse files

mailbox: qcom-ipcc: Reset CLEAR_ON_RECV_RD if set from boot firmware 



For some SoCs, boot firmware is using the same IPCC instance used
by Linux and it has kept CLEAR_ON_RECV_RD set which basically means
interrupt pending registers are cleared when RECV_ID is read and the
register automatically updates to the next pending interrupt/client
status based on priority.

Clear the CLEAR_ON_RECV_RD if it is set from the boot firmware.

Signed-off-by: default avatarMukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Signed-off-by: default avatarJassi Brar <jassisinghbrar@gmail.com>
parent e4b1d67e

drivers/mailbox/qcom-ipcc.c

+16 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <dt-bindings/mailbox/qcom-ipcc.h>



/* IPCC Register offsets */

#define IPCC_REG_CONFIG			0x08

#define IPCC_REG_SEND_ID		0x0c

#define IPCC_REG_RECV_ID		0x10

#define IPCC_REG_RECV_SIGNAL_ENABLE	0x14
@@ -21,6 +22,7 @@ 
#define IPCC_REG_RECV_SIGNAL_CLEAR	0x1c

#define IPCC_REG_CLIENT_CLEAR		0x38



#define IPCC_CLEAR_ON_RECV_RD		BIT(0)

#define IPCC_SIGNAL_ID_MASK		GENMASK(15, 0)

#define IPCC_CLIENT_ID_MASK		GENMASK(31, 16)
@@ -274,6 +276,7 @@ static int qcom_ipcc_pm_resume(struct device *dev) 
static int qcom_ipcc_probe(struct platform_device *pdev)

{

	struct qcom_ipcc *ipcc;

	u32 config_value;

	static int id;

	char *name;

	int ret;
@@ -288,6 +291,19 @@ static int qcom_ipcc_probe(struct platform_device *pdev) 
	if (IS_ERR(ipcc->base))

		return PTR_ERR(ipcc->base);



	/*

	 * It is possible that boot firmware is using the same IPCC instance

	 * as of the HLOS and it has kept CLEAR_ON_RECV_RD set which basically

	 * means Interrupt pending registers are cleared when RECV_ID is read.

	 * The register automatically updates to the next pending interrupt/client

	 * status based on priority.

	 */

	config_value = readl(ipcc->base + IPCC_REG_CONFIG);

	if (config_value & IPCC_CLEAR_ON_RECV_RD) {

		config_value &= ~(IPCC_CLEAR_ON_RECV_RD);

		writel(config_value, ipcc->base + IPCC_REG_CONFIG);

	}



	ipcc->irq = platform_get_irq(pdev, 0);

	if (ipcc->irq < 0)

		return ipcc->irq;