[SCSI] aci94xx: implement link rate setting

This patch implements the ability to set the minimum and maximum
linkrates for both libsas (for expanders) and aic94xx (for the host
phys).  It also tidies up the setting of the hardware min and max to
make sure they're updated when the expander emits a change broadcast.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

2 files changed, 29 insertions, 3 deletions

diff --git a/drivers/scsi/aic94xx/aic94xx.h b/drivers/scsi/aic94xx/aic94xx.h
index cb7caf1c9ce1..1bd5b4ecf3d5 100644
--- a/drivers/scsi/aic94xx/aic94xx.h
+++ b/drivers/scsi/aic94xx/aic94xx.h
@@ -109,6 +109,6 @@ int  asd_clear_nexus_port(struct asd_sas_port *port);
 int  asd_clear_nexus_ha(struct sas_ha_struct *sas_ha);
 
 /* ---------- Phy Management ---------- */
-int  asd_control_phy(struct asd_sas_phy *phy, enum phy_func func);
+int  asd_control_phy(struct asd_sas_phy *phy, enum phy_func func, void *arg);
 
 #endif
diff --git a/drivers/scsi/aic94xx/aic94xx_scb.c b/drivers/scsi/aic94xx/aic94xx_scb.c
index ef8ca08b545f..7ee49b51b724 100644
--- a/drivers/scsi/aic94xx/aic94xx_scb.c
+++ b/drivers/scsi/aic94xx/aic94xx_scb.c
@@ -52,6 +52,8 @@
 
 static inline void get_lrate_mode(struct asd_phy *phy, u8 oob_mode)
 {
+        struct sas_phy *sas_phy = phy->sas_phy.phy;
+
         switch (oob_mode & 7) {
         case PHY_SPEED_60:
                 /* FIXME: sas transport class doesn't have this */
@@ -67,6 +69,12 @@ static inline void get_lrate_mode(struct asd_phy *phy, u8 oob_mode)
                 phy->sas_phy.phy->negotiated_linkrate = SAS_LINK_RATE_1_5_GBPS;
                 break;
         }
+        sas_phy->negotiated_linkrate = phy->sas_phy.linkrate;
+        sas_phy->maximum_linkrate_hw = SAS_LINK_RATE_3_0_GBPS;
+        sas_phy->minimum_linkrate_hw = SAS_LINK_RATE_1_5_GBPS;
+        sas_phy->maximum_linkrate = phy->phy_desc->max_sas_lrate;
+        sas_phy->minimum_linkrate = phy->phy_desc->min_sas_lrate;
+
         if (oob_mode & SAS_MODE)
                 phy->sas_phy.oob_mode = SAS_OOB_MODE;
         else if (oob_mode & SATA_MODE)
@@ -710,14 +718,32 @@ static const int phy_func_table[] = {
         [PHY_FUNC_RELEASE_SPINUP_HOLD] = RELEASE_SPINUP_HOLD,
 };
 
-int asd_control_phy(struct asd_sas_phy *phy, enum phy_func func)
+int asd_control_phy(struct asd_sas_phy *phy, enum phy_func func, void *arg)
 {
         struct asd_ha_struct *asd_ha = phy->ha->lldd_ha;
+        struct asd_phy_desc *pd = asd_ha->phys[phy->id].phy_desc;
         struct asd_ascb *ascb;
+        struct sas_phy_linkrates *rates;
         int res = 1;
 
-        if (func == PHY_FUNC_CLEAR_ERROR_LOG)
+        switch (func) {
+        case PHY_FUNC_CLEAR_ERROR_LOG:
                 return -ENOSYS;
+        case PHY_FUNC_SET_LINK_RATE:
+                rates = arg;
+                if (rates->minimum_linkrate) {
+                        pd->min_sas_lrate = rates->minimum_linkrate;
+                        pd->min_sata_lrate = rates->minimum_linkrate;
+                }
+                if (rates->maximum_linkrate) {
+                        pd->max_sas_lrate = rates->maximum_linkrate;
+                        pd->max_sata_lrate = rates->maximum_linkrate;
+                }
+                func = PHY_FUNC_LINK_RESET;
+                break;
+        default:
+                break;
+        }
 
         ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
         if (!ascb)