msm: ipa: Add a support to retry uC send command

For the status IPA_HW_2_CPU_WDI_RX_FSM_TRANSITION_ERROR,
receive from the uC, add a logic to retry sending the same
command for maximum of 10 retires.

Change-Id: I4b241311e0699aea0e24b3a279622a8a1aaa737d
Acked-by: Mohammed Javid <mjavid@qti.qualcomm.com>
Signed-off-by: Utkarsh Saxena <usaxena@codeaurora.org>

4 files changed, 59 insertions, 43 deletions

diff --git a/drivers/platform/msm/ipa/ipa_v2/ipa_i.h b/drivers/platform/msm/ipa/ipa_v2/ipa_i.h
index a14d1fee9c35..bb11230c960a 100644
--- a/drivers/platform/msm/ipa/ipa_v2/ipa_i.h
+++ b/drivers/platform/msm/ipa/ipa_v2/ipa_i.h
@@ -51,6 +51,7 @@
 #define IPA_UC_FINISH_MAX 6
 #define IPA_UC_WAIT_MIN_SLEEP 1000
 #define IPA_UC_WAII_MAX_SLEEP 1200
+#define IPA_BAM_STOP_MAX_RETRY 10
 
 #define IPA_MAX_STATUS_STAT_NUM 30
 
diff --git a/drivers/platform/msm/ipa/ipa_v2/ipa_uc.c b/drivers/platform/msm/ipa/ipa_v2/ipa_uc.c
index 3dd2eb093317..364cd4b7d38a 100644
--- a/drivers/platform/msm/ipa/ipa_v2/ipa_uc.c
+++ b/drivers/platform/msm/ipa/ipa_v2/ipa_uc.c
@@ -590,6 +590,7 @@ int ipa_uc_send_cmd(u32 cmd, u32 opcode, u32 expected_status,
 {
 	int index;
 	union IpaHwCpuCmdCompletedResponseData_t uc_rsp;
+	int retries = 0;
 
 	mutex_lock(&ipa_ctx->uc_ctx.uc_lock);
 
@@ -599,6 +600,7 @@ int ipa_uc_send_cmd(u32 cmd, u32 opcode, u32 expected_status,
 		return -EBADF;
 	}
 
+send_cmd:
 	init_completion(&ipa_ctx->uc_ctx.uc_completion);
 
 	ipa_ctx->uc_ctx.uc_sram_mmio->cmdParams = cmd;
@@ -658,6 +660,19 @@ int ipa_uc_send_cmd(u32 cmd, u32 opcode, u32 expected_status,
 	}
 
 	if (ipa_ctx->uc_ctx.uc_status != expected_status) {
+		if (IPA_HW_2_CPU_WDI_RX_FSM_TRANSITION_ERROR ==
+			ipa_ctx->uc_ctx.uc_status) {
+			retries++;
+			if (retries == IPA_BAM_STOP_MAX_RETRY) {
+				IPAERR("Failed after %d tries\n", retries);
+			} else {
+				/* sleep for short period to flush IPA */
+				usleep_range(IPA_UC_WAIT_MIN_SLEEP,
+					IPA_UC_WAII_MAX_SLEEP);
+				goto send_cmd;
+			}
+		}
+
 		IPAERR("Recevied status %u, Expected status %u\n",
 			ipa_ctx->uc_ctx.uc_status, expected_status);
 		ipa_ctx->uc_ctx.pending_cmd = -1;
diff --git a/drivers/platform/msm/ipa/ipa_v2/ipa_uc_offload_i.h b/drivers/platform/msm/ipa/ipa_v2/ipa_uc_offload_i.h
index 3bec471b4656..a98d60249c0e 100644
--- a/drivers/platform/msm/ipa/ipa_v2/ipa_uc_offload_i.h
+++ b/drivers/platform/msm/ipa/ipa_v2/ipa_uc_offload_i.h
@@ -1,4 +1,4 @@
-/* Copyright (c) 2016, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -441,7 +441,7 @@ enum ipa_hw_offload_channel_states {
 
 
 /**
- * enum ipa_hw_2_cpu_cmd_resp_status -  Values that represent
+ * enum ipa_hw_2_cpu_offload_cmd_resp_status -  Values that represent
  * offload related command response status to be sent to CPU.
  */
 enum ipa_hw_2_cpu_offload_cmd_resp_status {
@@ -478,6 +478,47 @@ enum ipa_hw_2_cpu_offload_cmd_resp_status {
 };
 
 /**
+ * enum ipa_hw_2_cpu_cmd_resp_status -  Values that represent WDI related
+ * command response status to be sent to CPU.
+ */
+enum ipa_hw_2_cpu_cmd_resp_status {
+	IPA_HW_2_CPU_WDI_CMD_STATUS_SUCCESS            =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 0),
+	IPA_HW_2_CPU_MAX_WDI_TX_CHANNELS               =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 1),
+	IPA_HW_2_CPU_WDI_CE_RING_OVERRUN_POSSIBILITY   =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 2),
+	IPA_HW_2_CPU_WDI_CE_RING_SET_UP_FAILURE        =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 3),
+	IPA_HW_2_CPU_WDI_CE_RING_PARAMS_UNALIGNED      =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 4),
+	IPA_HW_2_CPU_WDI_COMP_RING_OVERRUN_POSSIBILITY =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 5),
+	IPA_HW_2_CPU_WDI_COMP_RING_SET_UP_FAILURE      =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 6),
+	IPA_HW_2_CPU_WDI_COMP_RING_PARAMS_UNALIGNED    =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 7),
+	IPA_HW_2_CPU_WDI_UNKNOWN_TX_CHANNEL            =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 8),
+	IPA_HW_2_CPU_WDI_TX_INVALID_FSM_TRANSITION     =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 9),
+	IPA_HW_2_CPU_WDI_TX_FSM_TRANSITION_ERROR       =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 10),
+	IPA_HW_2_CPU_MAX_WDI_RX_CHANNELS               =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 11),
+	IPA_HW_2_CPU_WDI_RX_RING_PARAMS_UNALIGNED      =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 12),
+	IPA_HW_2_CPU_WDI_RX_RING_SET_UP_FAILURE        =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 13),
+	IPA_HW_2_CPU_WDI_UNKNOWN_RX_CHANNEL            =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 14),
+	IPA_HW_2_CPU_WDI_RX_INVALID_FSM_TRANSITION     =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 15),
+	IPA_HW_2_CPU_WDI_RX_FSM_TRANSITION_ERROR       =
+		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 16),
+};
+
+/**
  * struct IpaHwSetUpCmd  -
  *
  *
diff --git a/drivers/platform/msm/ipa/ipa_v2/ipa_uc_wdi.c b/drivers/platform/msm/ipa/ipa_v2/ipa_uc_wdi.c
index f60669132865..56b4bf1a2d1e 100644
--- a/drivers/platform/msm/ipa/ipa_v2/ipa_uc_wdi.c
+++ b/drivers/platform/msm/ipa/ipa_v2/ipa_uc_wdi.c
@@ -110,47 +110,6 @@ enum ipa_cpu_2_hw_wdi_commands {
 };
 
 /**
- * enum ipa_hw_2_cpu_cmd_resp_status -  Values that represent WDI related
- * command response status to be sent to CPU.
- */
-enum ipa_hw_2_cpu_cmd_resp_status {
-	IPA_HW_2_CPU_WDI_CMD_STATUS_SUCCESS            =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 0),
-	IPA_HW_2_CPU_MAX_WDI_TX_CHANNELS               =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 1),
-	IPA_HW_2_CPU_WDI_CE_RING_OVERRUN_POSSIBILITY   =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 2),
-	IPA_HW_2_CPU_WDI_CE_RING_SET_UP_FAILURE        =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 3),
-	IPA_HW_2_CPU_WDI_CE_RING_PARAMS_UNALIGNED      =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 4),
-	IPA_HW_2_CPU_WDI_COMP_RING_OVERRUN_POSSIBILITY =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 5),
-	IPA_HW_2_CPU_WDI_COMP_RING_SET_UP_FAILURE      =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 6),
-	IPA_HW_2_CPU_WDI_COMP_RING_PARAMS_UNALIGNED    =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 7),
-	IPA_HW_2_CPU_WDI_UNKNOWN_TX_CHANNEL            =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 8),
-	IPA_HW_2_CPU_WDI_TX_INVALID_FSM_TRANSITION     =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 9),
-	IPA_HW_2_CPU_WDI_TX_FSM_TRANSITION_ERROR       =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 10),
-	IPA_HW_2_CPU_MAX_WDI_RX_CHANNELS               =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 11),
-	IPA_HW_2_CPU_WDI_RX_RING_PARAMS_UNALIGNED      =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 12),
-	IPA_HW_2_CPU_WDI_RX_RING_SET_UP_FAILURE        =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 13),
-	IPA_HW_2_CPU_WDI_UNKNOWN_RX_CHANNEL            =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 14),
-	IPA_HW_2_CPU_WDI_RX_INVALID_FSM_TRANSITION     =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 15),
-	IPA_HW_2_CPU_WDI_RX_FSM_TRANSITION_ERROR       =
-		FEATURE_ENUM_VAL(IPA_HW_FEATURE_WDI, 16),
-};
-
-/**
  * enum ipa_hw_wdi_errors - WDI specific error types.
  * @IPA_HW_WDI_ERROR_NONE : No error persists
  * @IPA_HW_WDI_CHANNEL_ERROR : Error is specific to channel