[PATCH 1/3 v2] ahci: qoriq: added a condition to enable dma coherence

[yuantian.tang]

From: Tang Yuantian <yuantian.t...@nxp.com>

Enable DMA coherence in SATA controller on condition that
dma-coherent property exists in sata node in DTS.

Signed-off-by: Tang Yuantian <yuantian.t...@nxp.com>
---
v2:
  - use of_dma_is_coherent() instead of open-coding.

 drivers/ata/ahci_qoriq.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/ata/ahci_qoriq.c b/drivers/ata/ahci_qoriq.c
index 9884c8c..01ef662 100644
--- a/drivers/ata/ahci_qoriq.c
+++ b/drivers/ata/ahci_qoriq.c
@@ -59,6 +59,7 @@ struct ahci_qoriq_priv {
        struct ccsr_ahci *reg_base;
        enum ahci_qoriq_type type;
        void __iomem *ecc_addr;
+       bool is_dmacoherent;
 };
 
 static const struct of_device_id ahci_qoriq_of_match[] = {
@@ -164,26 +165,31 @@ static int ahci_qoriq_phy_init(struct ahci_host_priv 
*hpriv)
                writel(LS1021A_PORT_PHY4, reg_base + PORT_PHY4);
                writel(LS1021A_PORT_PHY5, reg_base + PORT_PHY5);
                writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
-               writel(AHCI_PORT_AXICC_CFG, reg_base + LS1021A_AXICC_ADDR);
+               if (qpriv->is_dmacoherent)
+                       writel(AHCI_PORT_AXICC_CFG,
+                                       reg_base + LS1021A_AXICC_ADDR);
                break;
 
        case AHCI_LS1043A:
                writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
                writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
-               writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
+               if (qpriv->is_dmacoherent)
+                       writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
                break;
 
        case AHCI_LS2080A:
                writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
                writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
-               writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
+               if (qpriv->is_dmacoherent)
+                       writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
                break;
 
        case AHCI_LS1046A:
                writel(LS1046A_SATA_ECC_DIS, qpriv->ecc_addr);
                writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
                writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
-               writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
+               if (qpriv->is_dmacoherent)
+                       writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
                break;
        }
 
@@ -221,6 +227,7 @@ static int ahci_qoriq_probe(struct platform_device *pdev)
                if (IS_ERR(qoriq_priv->ecc_addr))
                        return PTR_ERR(qoriq_priv->ecc_addr);
        }
+       qoriq_priv->is_dmacoherent = of_dma_is_coherent(np);
 
        rc = ahci_platform_enable_resources(hpriv);
        if (rc)
-- 
2.1.0.27.g96db324