mmc: msm_sdcc: Handle dma resource not present case

If DMA resource is not available then SDCC driver
should atleast work in PIO data transfer mode.

Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 10 insertions, 5 deletions

diff --git a/drivers/mmc/host/msm_sdcc.c b/drivers/mmc/host/msm_sdcc.c
index a835ac0269e0..61c7d385fd3a 100644
--- a/drivers/mmc/host/msm_sdcc.c
+++ b/drivers/mmc/host/msm_sdcc.c
@@ -1242,9 +1242,13 @@ msmsdcc_probe(struct platform_device *pdev)
         /*
          * Setup DMA
          */
-        ret = msmsdcc_init_dma(host);
-        if (ret)
-                goto ioremap_free;
+        if (host->dmares) {
+                ret = msmsdcc_init_dma(host);
+                if (ret)
+                        goto ioremap_free;
+        } else {
+                host->dma.channel = -1;
+        }
 
         /* Get our clocks */
         host->pclk = clk_get(&pdev->dev, "sdc_pclk");
@@ -1388,8 +1392,9 @@ msmsdcc_probe(struct platform_device *pdev)
  pclk_put:
         clk_put(host->pclk);
 dma_free:
-        dma_free_coherent(NULL, sizeof(struct msmsdcc_nc_dmadata),
-                                host->dma.nc, host->dma.nc_busaddr);
+        if (host->dmares)
+                dma_free_coherent(NULL, sizeof(struct msmsdcc_nc_dmadata),
+                                        host->dma.nc, host->dma.nc_busaddr);
 ioremap_free:
         tasklet_kill(&host->dma_tlet);
         iounmap(host->base);