msm: ipa: Enable GSI Channel almost empty Feature

Enable GSI Channel almost empty Feature for MHI DL channel.

Change-Id: I9e27044f30bf61b91c0dcd7b7f109404b303bb62

drivers/platform/msm/gsi/gsi.c

@@ -5145,6 +5145,13 @@ int gsi_get_fw_version(struct gsi_fw_version *ver)
 	return 0;
 }
 
+void gsi_update_almst_empty_thrshold(unsigned long chan_hdl, unsigned short threshold)
+{
+	gsihal_write_reg_nk(GSI_EE_n_CH_k_CH_ALMST_EMPTY_THRSHOLD,
+		gsi_ctx->per.ee, chan_hdl, threshold);
+}
+EXPORT_SYMBOL(gsi_update_almst_empty_thrshold);
+
 static int msm_gsi_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;

drivers/platform/msm/gsi/gsi.h

@@ -2316,6 +2316,15 @@ int gsi_enable_flow_control_ee(unsigned int chan_idx, unsigned int ee,
 */
 int gsi_query_msi_addr(unsigned long chan_hdl, phys_addr_t *addr);
 
+/**
+* gsi_update_almst_empty_thrshold - update almst_empty_thrshold
+*
+* @chan_id: channel id
+* @threshold: Threshold value for channel almost empty indication to MCS.
+*
+*/
+void gsi_update_almst_empty_thrshold(unsigned long chan_hdl, unsigned short threshold);
+
 /**
 * gsi_dump_ch_info - channel information.
 *

drivers/platform/msm/gsi/gsihal/gsihal_reg.c

@@ -171,6 +171,7 @@ static const char *gsireg_name_to_str[GSI_REG_MAX] = {
 	__stringify(GSI_GSI_MCS_PROFILING_MCS_BUSY_CNT_MSB),
 	__stringify(GSI_GSI_MCS_PROFILING_MCS_IDLE_CNT_LSB),
 	__stringify(GSI_GSI_MCS_PROFILING_MCS_IDLE_CNT_MSB),
+	__stringify(GSI_EE_n_CH_k_CH_ALMST_EMPTY_THRSHOLD),
 };
 
 /*
@@ -1757,7 +1758,10 @@ static struct gsihal_reg_obj gsihal_reg_objs[GSI_VER_MAX][GSI_REG_MAX] = {
 	0x0001401c, 0x12000, 0x80 },
 	[GSI_VER_3_0][GSI_EE_n_GSI_CH_k_CNTXT_8] = {
 	gsireg_construct_dummy, gsireg_parse_dummy,
-	0x00014020 , 0x12000, 0x80 },
+	0x00014020, 0x12000, 0x80 },
+	[GSI_VER_3_0][GSI_EE_n_CH_k_CH_ALMST_EMPTY_THRSHOLD] = {
+	gsireg_construct_dummy, gsireg_parse_dummy,
+	0x00014028, 0x12000, 0x80 },
 	[GSI_VER_3_0][GSI_EE_n_GSI_CH_k_RE_FETCH_READ_PTR] = {
 	gsireg_construct_dummy, gsireg_parse_dummy,
 	0x00014040, 0x12000, 0x80 },

drivers/platform/msm/gsi/gsihal/gsihal_reg.h

@@ -161,6 +161,7 @@ enum gsihal_reg_name {
 	GSI_GSI_MCS_PROFILING_MCS_BUSY_CNT_MSB,
 	GSI_GSI_MCS_PROFILING_MCS_IDLE_CNT_LSB,
 	GSI_GSI_MCS_PROFILING_MCS_IDLE_CNT_MSB,
+	GSI_EE_n_CH_k_CH_ALMST_EMPTY_THRSHOLD,
 	GSI_REG_MAX
 };
 

drivers/platform/msm/ipa/ipa_v3/ipa_mhi.c

@@ -180,7 +180,11 @@ static int ipa3_mhi_get_ch_poll_cfg(enum ipa_client_type client,
 		if (IPA_CLIENT_IS_PROD(client))
 			return 7;
 		else
-			return (ring_size/2)/8;
+			/* IPA5.0 use almst empty register */
+			if (ipa3_ctx->ipa_hw_type >= IPA_HW_v5_0)
+				return (ring_size/2);
+			else
+				return (ring_size/2)/8;
 		break;
 	default:
 		return ch_ctx_host->pollcfg;
@@ -350,8 +354,14 @@ static int ipa_mhi_start_gsi_channel(enum ipa_client_type client,
 		ch_scratch1.mhi_v2.mhi_host_wp_addr_hi =
 			(ch_scratch.mhi.mhi_host_wp_addr & 0x1FF00000000ll) >>
 			32;
-		ch_scratch1.mhi_v2.polling_configuration =
-			ch_scratch.mhi.polling_configuration;
+		if (ipa3_ctx->ipa_hw_type >= IPA_HW_v5_0 &&
+			client == IPA_CLIENT_MHI_CONS) {
+			gsi_update_almst_empty_thrshold(ep->gsi_chan_hdl,
+				ch_scratch.mhi.polling_configuration);
+		} else {
+			ch_scratch1.mhi_v2.polling_configuration =
+				ch_scratch.mhi.polling_configuration;
+		}
 		ch_scratch1.mhi_v2.assert_bit40 = ch_scratch.mhi.assert_bit40;
 		ch_scratch1.mhi_v2.burst_mode_enabled =
 			ch_scratch.mhi.burst_mode_enabled;