mmc: omap_hsmmc: if multiblock reads are broken, disable them

When device data indicates that multiple block reads are not supported
on a given HSMMC controller instance, log a message to the console, and
pass the appropriate MMC capability flag to the MMC core.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Dave Hylands <dhylands@gmail.com>
Tested-by: Steve Sakoman <sakoman@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index bb334be562d7..e8ff12396680 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -1942,6 +1942,10 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev)
         omap_hsmmc_context_save(host);
 
         mmc->caps |= MMC_CAP_DISABLE;
+        if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
+                dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n");
+                mmc->caps2 |= MMC_CAP2_NO_MULTI_READ;
+        }
 
         pm_runtime_enable(host->dev);
         pm_runtime_get_sync(host->dev);