1 files changed, 68 insertions, 0 deletions

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 47184567248..8a751054c8a 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -251,6 +251,11 @@ enum {
         HC_IRQ_COAL_IO_THRESHOLD_OFS    = 0x000c,
         HC_IRQ_COAL_TIME_THRESHOLD_OFS  = 0x0010,
 
+        SOC_LED_CTRL_OFS        = 0x2c,
+        SOC_LED_CTRL_BLINK      = (1 << 0),     /* Active LED blink */
+        SOC_LED_CTRL_ACT_PRESENCE = (1 << 2),   /* Multiplex dev presence */
+                                                /*  with dev activity LED */
+
         /* Shadow block registers */
         SHD_BLK_OFS             = 0x100,
         SHD_CTL_AST_OFS         = 0x20,         /* ofs from SHD_BLK_OFS */
@@ -411,6 +416,7 @@ enum {
         MV_HP_PCIE              = (1 << 9),     /* PCIe bus/regs: 7042 */
         MV_HP_CUT_THROUGH       = (1 << 10),    /* can use EDMA cut-through */
         MV_HP_FLAG_SOC          = (1 << 11),    /* SystemOnChip, no PCI */
+        MV_HP_QUIRK_LED_BLINK_EN = (1 << 12),   /* is led blinking enabled? */
 
         /* Port private flags (pp_flags) */
         MV_PP_FLAG_EDMA_EN      = (1 << 0),     /* is EDMA engine enabled? */
@@ -1404,6 +1410,61 @@ static void mv_bmdma_enable_iie(struct ata_port *ap, int enable_bmdma)
         mv_write_cached_reg(mv_ap_base(ap) + EDMA_UNKNOWN_RSVD_OFS, old, new);
 }
 
+/*
+ * SOC chips have an issue whereby the HDD LEDs don't always blink
+ * during I/O when NCQ is enabled. Enabling a special "LED blink" mode
+ * of the SOC takes care of it, generating a steady blink rate when
+ * any drive on the chip is active.
+ *
+ * Unfortunately, the blink mode is a global hardware setting for the SOC,
+ * so we must use it whenever at least one port on the SOC has NCQ enabled.
+ *
+ * We turn "LED blink" off when NCQ is not in use anywhere, because the normal
+ * LED operation works then, and provides better (more accurate) feedback.
+ *
+ * Note that this code assumes that an SOC never has more than one HC onboard.
+ */
+static void mv_soc_led_blink_enable(struct ata_port *ap)
+{
+        struct ata_host *host = ap->host;
+        struct mv_host_priv *hpriv = host->private_data;
+        void __iomem *hc_mmio;
+        u32 led_ctrl;
+
+        if (hpriv->hp_flags & MV_HP_QUIRK_LED_BLINK_EN)
+                return;
+        hpriv->hp_flags |= MV_HP_QUIRK_LED_BLINK_EN;
+        hc_mmio = mv_hc_base_from_port(mv_host_base(host), ap->port_no);
+        led_ctrl = readl(hc_mmio + SOC_LED_CTRL_OFS);
+        writel(led_ctrl | SOC_LED_CTRL_BLINK, hc_mmio + SOC_LED_CTRL_OFS);
+}
+
+static void mv_soc_led_blink_disable(struct ata_port *ap)
+{
+        struct ata_host *host = ap->host;
+        struct mv_host_priv *hpriv = host->private_data;
+        void __iomem *hc_mmio;
+        u32 led_ctrl;
+        unsigned int port;
+
+        if (!(hpriv->hp_flags & MV_HP_QUIRK_LED_BLINK_EN))
+                return;
+
+        /* disable led-blink only if no ports are using NCQ */
+        for (port = 0; port < hpriv->n_ports; port++) {
+                struct ata_port *this_ap = host->ports[port];
+                struct mv_port_priv *pp = this_ap->private_data;
+
+                if (pp->pp_flags & MV_PP_FLAG_NCQ_EN)
+                        return;
+        }
+
+        hpriv->hp_flags &= ~MV_HP_QUIRK_LED_BLINK_EN;
+        hc_mmio = mv_hc_base_from_port(mv_host_base(host), ap->port_no);
+        led_ctrl = readl(hc_mmio + SOC_LED_CTRL_OFS);
+        writel(led_ctrl & ~SOC_LED_CTRL_BLINK, hc_mmio + SOC_LED_CTRL_OFS);
+}
+
 static void mv_edma_cfg(struct ata_port *ap, int want_ncq, int want_edma)
 {
         u32 cfg;
@@ -1451,6 +1512,13 @@ static void mv_edma_cfg(struct ata_port *ap, int want_ncq, int want_edma)
                 if (hpriv->hp_flags & MV_HP_CUT_THROUGH)
                         cfg |= (1 << 17); /* enab cut-thru (dis stor&forwrd) */
                 mv_bmdma_enable_iie(ap, !want_edma);
+
+                if (IS_SOC(hpriv)) {
+                        if (want_ncq)
+                                mv_soc_led_blink_enable(ap);
+                        else
+                                mv_soc_led_blink_disable(ap);
+                }
         }
 
         if (want_ncq) {