linux-kernel - [PATCH 2/5] switchtec: Set DMA coherent mask in Switchtec driver

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Message-ID: <1544433144-7563-3-git-send-email-wesley.sheng@microchip.com>
Date:   Mon, 10 Dec 2018 17:12:21 +0800
From:   Wesley Sheng <wesley.sheng@...rochip.com>
To:     <kurt.schwemmer@...rosemi.com>, <logang@...tatee.com>,
        <bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <wesleyshenggit@...a.com>, <wesley.sheng@...rochip.com>
Subject: [PATCH 2/5] switchtec: Set DMA coherent mask in Switchtec driver

From: Boris Glimcher <Boris.Glimcher@....com>

Switchtec hardware supports 64-bit DMA, set the correct DMA mask.
This allows the CMA to allocate larger buffers for memory windows.

Signed-off-by: Boris Glimcher <Boris.Glimcher@....com>
Signed-off-by: Wesley Sheng <wesley.sheng@...rochip.com>
Reviewed-by: Logan Gunthorpe <logang@...tatee.com>
---
 drivers/pci/switch/switchtec.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index d2bca2d..480107e 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -1237,6 +1237,10 @@ static int switchtec_init_pci(struct switchtec_dev *stdev,
 	if (rc)
 		return rc;
 
+	rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
+	if (rc)
+		return rc;
+
 	pci_set_master(pdev);
 
 	stdev->mmio = pcim_iomap_table(pdev)[0];
-- 
2.7.4