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Commit 71e24ae6 authored by Mahesh Sivasubramanian's avatar Mahesh Sivasubramanian
Browse files

rpm-smd: Handle TX FIFO full scenario by retrying 



When a rpm-smd packet transmission is attempted and fails due to
the TX FIFO being full, retry for a fixed duration before returning
failure.

Change-Id: I93ecfb303e43ae56f4d5f12a88589e13a966cfcd
Signed-off-by: default avatarKarthik Parsha <kparsha@codeaurora.org>
Signed-off-by: default avatarMahesh Sivasubramanian <msivasub@codeaurora.org>
parent 3b74bf1e

drivers/soc/qcom/rpm-smd.c

+10 −7
Original line number Diff line number Diff line
@@ -1139,13 +1139,16 @@ static int msm_rpm_glink_send_buffer(char *buf, uint32_t size, bool noirq) 
	do {

		ret = glink_tx(glink_data->glink_handle, buf, buf,

					size, GLINK_TX_SINGLE_THREADED);

		if (ret == -EBUSY) {

			pr_warn("%s: Channel is not ready. ret = %d\n",

							__func__, ret);

			spin_unlock_irqrestore(&msm_rpm_data.smd_lock_write,

									flags);

		if (ret == -EBUSY || ret == -ENOSPC) {

			if (!noirq) {

				spin_unlock_irqrestore(

					&msm_rpm_data.smd_lock_write, flags);

				cpu_relax();

				spin_lock_irqsave(

					&msm_rpm_data.smd_lock_write, flags);

			} else {

				udelay(5);

			spin_lock_irqsave(&msm_rpm_data.smd_lock_write, flags);

			}

			timeout--;

		} else {

			ret = 0;