From: Manjunathappa, Prakash <prakash.pm@ti.com>
Date: Tue, 5 Feb 2013 12:22:24 +0000 (+0530)
Subject: mmc: davinci_mmc: allow driver to work without DMA resource
X-Git-Tag: firefly_0821_release~3680^2~578^2~56
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e3e020f8acbd39a6feb1b6903725aaf658b0fec4;p=firefly-linux-kernel-4.4.55.git

mmc: davinci_mmc: allow driver to work without DMA resource

Do not return probe failure with missing DMA resources, allow driver
to work in PIO mode.  Tested on da850-evm by mounting partition
followed by file creation and deletion.

Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
Tested-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
---

diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index 20636772c09b..27123f8b7041 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -1190,13 +1190,15 @@ static int __init davinci_mmcsd_probe(struct platform_device *pdev)
 
 	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 	if (!r)
-		goto out;
-	host->rxdma = r->start;
+		dev_warn(&pdev->dev, "RX DMA resource not specified\n");
+	else
+		host->rxdma = r->start;
 
 	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 	if (!r)
-		goto out;
-	host->txdma = r->start;
+		dev_warn(&pdev->dev, "TX DMA resource not specified\n");
+	else
+		host->txdma = r->start;
 
 	host->mem_res = mem;
 	host->base = ioremap(mem->start, mem_size);