Merge branch 'net-ipa-simplify-endpoint-programming'

Alex Elder says:

====================
net: ipa: simplify endpoint programming

Add tests to functions so they don't update undefined endpoint
registers, rather than requiring the caller to avoid calling them.

Move the call to a workaround function required when suspending
inside the function that puts an endpoint into suspend mode.  This
requires moving a few functions (which are otherwise unchanged).

Then simplify ipa_endpoint_program() to call essentially all
endpoint register update functions unconditionally.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ipa/ipa_endpoint.c

@@ -318,41 +318,102 @@ ipa_endpoint_program_delay(struct ipa_endpoint *endpoint, bool enable)
 {
 	/* assert(endpoint->toward_ipa); */
 
+	/* Delay mode doesn't work properly for IPA v4.2 */
+	if (endpoint->ipa->version != IPA_VERSION_4_2)
 		(void)ipa_endpoint_init_ctrl(endpoint, enable);
 }
 
-/* Returns previous suspend state (true means it was enabled) */
+static bool ipa_endpoint_aggr_active(struct ipa_endpoint *endpoint)
+{
+	u32 mask = BIT(endpoint->endpoint_id);
+	struct ipa *ipa = endpoint->ipa;
+	u32 offset;
+	u32 val;
+
+	/* assert(mask & ipa->available); */
+	offset = ipa_reg_state_aggr_active_offset(ipa->version);
+	val = ioread32(ipa->reg_virt + offset);
+
+	return !!(val & mask);
+}
+
+static void ipa_endpoint_force_close(struct ipa_endpoint *endpoint)
+{
+	u32 mask = BIT(endpoint->endpoint_id);
+	struct ipa *ipa = endpoint->ipa;
+
+	/* assert(mask & ipa->available); */
+	iowrite32(mask, ipa->reg_virt + IPA_REG_AGGR_FORCE_CLOSE_OFFSET);
+}
+
+/**
+ * ipa_endpoint_suspend_aggr() - Emulate suspend interrupt
+ * @endpoint_id:	Endpoint on which to emulate a suspend
+ *
+ *  Emulate suspend IPA interrupt to unsuspend an endpoint suspended
+ *  with an open aggregation frame.  This is to work around a hardware
+ *  issue in IPA version 3.5.1 where the suspend interrupt will not be
+ *  generated when it should be.
+ */
+static void ipa_endpoint_suspend_aggr(struct ipa_endpoint *endpoint)
+{
+	struct ipa *ipa = endpoint->ipa;
+
+	if (!endpoint->data->aggregation)
+		return;
+
+	/* Nothing to do if the endpoint doesn't have aggregation open */
+	if (!ipa_endpoint_aggr_active(endpoint))
+		return;
+
+	/* Force close aggregation */
+	ipa_endpoint_force_close(endpoint);
+
+	ipa_interrupt_simulate_suspend(ipa->interrupt);
+}
+
+/* Returns previous suspend state (true means suspend was enabled) */
 static bool
 ipa_endpoint_program_suspend(struct ipa_endpoint *endpoint, bool enable)
 {
+	bool suspended;
+
+	if (endpoint->ipa->version != IPA_VERSION_3_5_1)
+		return enable;	/* For IPA v4.0+, no change made */
+
 	/* assert(!endpoint->toward_ipa); */
 
-	return ipa_endpoint_init_ctrl(endpoint, enable);
+	suspended = ipa_endpoint_init_ctrl(endpoint, enable);
+
+	/* A client suspended with an open aggregation frame will not
+	 * generate a SUSPEND IPA interrupt.  If enabling suspend, have
+	 * ipa_endpoint_suspend_aggr() handle this.
+	 */
+	if (enable && !suspended)
+		ipa_endpoint_suspend_aggr(endpoint);
+
+	return suspended;
 }
 
 /* Enable or disable delay or suspend mode on all modem endpoints */
 void ipa_endpoint_modem_pause_all(struct ipa *ipa, bool enable)
 {
-	bool support_suspend;
 	u32 endpoint_id;
 
 	/* DELAY mode doesn't work correctly on IPA v4.2 */
 	if (ipa->version == IPA_VERSION_4_2)
 		return;
 
-	/* Only IPA v3.5.1 supports SUSPEND mode on RX endpoints */
-	support_suspend = ipa->version == IPA_VERSION_3_5_1;
-
 	for (endpoint_id = 0; endpoint_id < IPA_ENDPOINT_MAX; endpoint_id++) {
 		struct ipa_endpoint *endpoint = &ipa->endpoint[endpoint_id];
 
 		if (endpoint->ee_id != GSI_EE_MODEM)
 			continue;
 
-		/* Set TX delay mode, or for IPA v3.5.1 RX suspend mode */
+		/* Set TX delay mode or RX suspend mode */
 		if (endpoint->toward_ipa)
 			ipa_endpoint_program_delay(endpoint, enable);
-		else if (support_suspend)
+		else
 			(void)ipa_endpoint_program_suspend(endpoint, enable);
 	}
 }
@@ -527,6 +588,9 @@ static void ipa_endpoint_init_hdr_metadata_mask(struct ipa_endpoint *endpoint)
 	u32 val = 0;
 	u32 offset;
 
+	if (endpoint->toward_ipa)
+		return;		/* Register not valid for TX endpoints */
+
 	offset = IPA_REG_ENDP_INIT_HDR_METADATA_MASK_N_OFFSET(endpoint_id);
 
 	/* Note that HDR_ENDIANNESS indicates big endian header fields */
@@ -541,6 +605,9 @@ static void ipa_endpoint_init_mode(struct ipa_endpoint *endpoint)
 	u32 offset = IPA_REG_ENDP_INIT_MODE_N_OFFSET(endpoint->endpoint_id);
 	u32 val;
 
+	if (!endpoint->toward_ipa)
+		return;		/* Register not valid for RX endpoints */
+
 	if (endpoint->data->dma_mode) {
 		enum ipa_endpoint_name name = endpoint->data->dma_endpoint;
 		u32 dma_endpoint_id;
@@ -699,6 +766,9 @@ static void ipa_endpoint_init_deaggr(struct ipa_endpoint *endpoint)
 	u32 offset = IPA_REG_ENDP_INIT_DEAGGR_N_OFFSET(endpoint->endpoint_id);
 	u32 val = 0;
 
+	if (!endpoint->toward_ipa)
+		return;		/* Register not valid for RX endpoints */
+
 	/* DEAGGR_HDR_LEN is 0 */
 	/* PACKET_OFFSET_VALID is 0 */
 	/* PACKET_OFFSET_LOCATION is ignored (not valid) */
@@ -713,6 +783,9 @@ static void ipa_endpoint_init_seq(struct ipa_endpoint *endpoint)
 	u32 seq_type = endpoint->seq_type;
 	u32 val = 0;
 
+	if (!endpoint->toward_ipa)
+		return;		/* Register not valid for RX endpoints */
+
 	/* Sequencer type is made up of four nibbles */
 	val |= u32_encode_bits(seq_type & 0xf, HPS_SEQ_TYPE_FMASK);
 	val |= u32_encode_bits((seq_type >> 4) & 0xf, DPS_SEQ_TYPE_FMASK);
@@ -1142,29 +1215,6 @@ void ipa_endpoint_default_route_clear(struct ipa *ipa)
 	ipa_endpoint_default_route_set(ipa, 0);
 }
 
-static bool ipa_endpoint_aggr_active(struct ipa_endpoint *endpoint)
-{
-	u32 mask = BIT(endpoint->endpoint_id);
-	struct ipa *ipa = endpoint->ipa;
-	u32 offset;
-	u32 val;
-
-	/* assert(mask & ipa->available); */
-	offset = ipa_reg_state_aggr_active_offset(ipa->version);
-	val = ioread32(ipa->reg_virt + offset);
-
-	return !!(val & mask);
-}
-
-static void ipa_endpoint_force_close(struct ipa_endpoint *endpoint)
-{
-	u32 mask = BIT(endpoint->endpoint_id);
-	struct ipa *ipa = endpoint->ipa;
-
-	/* assert(mask & ipa->available); */
-	iowrite32(mask, ipa->reg_virt + IPA_REG_AGGR_FORCE_CLOSE_OFFSET);
-}
-
 /**
  * ipa_endpoint_reset_rx_aggr() - Reset RX endpoint with aggregation active
  * @endpoint:	Endpoint to be reset
@@ -1209,7 +1259,6 @@ static int ipa_endpoint_reset_rx_aggr(struct ipa_endpoint *endpoint)
 	gsi_channel_reset(gsi, endpoint->channel_id, false);
 
 	/* Make sure the channel isn't suspended */
-	if (endpoint->ipa->version == IPA_VERSION_3_5_1)
 	suspended = ipa_endpoint_program_suspend(endpoint, false);
 
 	/* Start channel and do a 1 byte read */
@@ -1293,23 +1342,18 @@ static void ipa_endpoint_reset(struct ipa_endpoint *endpoint)
 
 static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
 {
-	if (endpoint->toward_ipa) {
-		if (endpoint->ipa->version != IPA_VERSION_4_2)
+	if (endpoint->toward_ipa)
 		ipa_endpoint_program_delay(endpoint, false);
+	else
+		(void)ipa_endpoint_program_suspend(endpoint, false);
+	ipa_endpoint_init_cfg(endpoint);
+	ipa_endpoint_init_hdr(endpoint);
 	ipa_endpoint_init_hdr_ext(endpoint);
+	ipa_endpoint_init_hdr_metadata_mask(endpoint);
+	ipa_endpoint_init_mode(endpoint);
 	ipa_endpoint_init_aggr(endpoint);
 	ipa_endpoint_init_deaggr(endpoint);
 	ipa_endpoint_init_seq(endpoint);
-		ipa_endpoint_init_mode(endpoint);
-	} else {
-		if (endpoint->ipa->version == IPA_VERSION_3_5_1)
-			(void)ipa_endpoint_program_suspend(endpoint, false);
-		ipa_endpoint_init_hdr_ext(endpoint);
-		ipa_endpoint_init_aggr(endpoint);
-		ipa_endpoint_init_hdr_metadata_mask(endpoint);
-	}
-	ipa_endpoint_init_cfg(endpoint);
-	ipa_endpoint_init_hdr(endpoint);
 	ipa_endpoint_status(endpoint);
 }
 
@@ -1365,34 +1409,6 @@ void ipa_endpoint_disable_one(struct ipa_endpoint *endpoint)
 			endpoint->endpoint_id);
 }
 
-/**
- * ipa_endpoint_suspend_aggr() - Emulate suspend interrupt
- * @endpoint_id:	Endpoint on which to emulate a suspend
- *
- *  Emulate suspend IPA interrupt to unsuspend an endpoint suspended
- *  with an open aggregation frame.  This is to work around a hardware
- *  issue in IPA version 3.5.1 where the suspend interrupt will not be
- *  generated when it should be.
- */
-static void ipa_endpoint_suspend_aggr(struct ipa_endpoint *endpoint)
-{
-	struct ipa *ipa = endpoint->ipa;
-
-	/* assert(ipa->version == IPA_VERSION_3_5_1); */
-
-	if (!endpoint->data->aggregation)
-		return;
-
-	/* Nothing to do if the endpoint doesn't have aggregation open */
-	if (!ipa_endpoint_aggr_active(endpoint))
-		return;
-
-	/* Force close aggregation */
-	ipa_endpoint_force_close(endpoint);
-
-	ipa_interrupt_simulate_suspend(ipa->interrupt);
-}
-
 void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint)
 {
 	struct device *dev = &endpoint->ipa->pdev->dev;
@@ -1406,19 +1422,11 @@ void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint)
 	if (!endpoint->toward_ipa)
 		ipa_endpoint_replenish_disable(endpoint);
 
-	/* IPA v3.5.1 doesn't use channel stop for suspend */
-	stop_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
-	if (!endpoint->toward_ipa && !stop_channel) {
-		/* Due to a hardware bug, a client suspended with an open
-		 * aggregation frame will not generate a SUSPEND IPA
-		 * interrupt.  We work around this by force-closing the
-		 * aggregation frame, then simulating the arrival of such
-		 * an interrupt.
-		 */
+	if (!endpoint->toward_ipa)
 		(void)ipa_endpoint_program_suspend(endpoint, true);
-		ipa_endpoint_suspend_aggr(endpoint);
-	}
 
+	/* IPA v3.5.1 doesn't use channel stop for suspend */
+	stop_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
 	ret = gsi_channel_suspend(gsi, endpoint->channel_id, stop_channel);
 	if (ret)
 		dev_err(dev, "error %d suspending channel %u\n", ret,
@@ -1435,11 +1443,11 @@ void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint)
 	if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
 		return;
 
-	/* IPA v3.5.1 doesn't use channel start for resume */
-	start_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
-	if (!endpoint->toward_ipa && !start_channel)
+	if (!endpoint->toward_ipa)
 		(void)ipa_endpoint_program_suspend(endpoint, false);
 
+	/* IPA v3.5.1 doesn't use channel start for resume */
+	start_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
 	ret = gsi_channel_resume(gsi, endpoint->channel_id, start_channel);
 	if (ret)
 		dev_err(dev, "error %d resuming channel %u\n", ret,