From: Elad Nachman <enachman@xxxxxxxxxxx>
There is a limitation on AC5 SoC that mmc controller
can't have DMA access over 2G memory.
Signed-off-by: Elad Nachman <enachman@xxxxxxxxxxx>
Signed-off-by: Vadym Kochan <vadym.kochan@xxxxxxxxxxx>
---
drivers/mmc/host/sdhci-xenon.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
index 08e838400b52..666d06b58564 100644
--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -18,6 +18,7 @@
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
+#include <linux/mm.h>
#include "sdhci-pltfm.h"
#include "sdhci-xenon.h"
@@ -422,6 +423,8 @@ static int xenon_probe_params(struct platform_device *pdev)
struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
u32 sdhc_id, nr_sdhc;
u32 tuning_count;
+ struct device_node *np = pdev->dev.of_node;
+ struct sysinfo si;
/* Disable HS200 on Armada AP806 */
if (priv->hw_version == XENON_AP806)
@@ -450,6 +453,15 @@ static int xenon_probe_params(struct platform_device *pdev)
}
priv->tuning_count = tuning_count;
+ si_meminfo(&si);
+
+ if (of_device_is_compatible(np, "marvell,ac5-sdhci") &&
+ ((si.totalram * si.mem_unit) > 0x80000000 /*2G*/)) {
+ host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
+ host->quirks |= SDHCI_QUIRK_BROKEN_ADMA;
+ dev_info(mmc_dev(mmc), "Disabling DMA because of 2GB DMA access limit.\n");
+ }
+
return xenon_phy_parse_params(dev, host);
}
@@ -682,6 +694,7 @@ static const struct of_device_id sdhci_xenon_dt_ids[] = {
{ .compatible = "marvell,armada-ap807-sdhci", .data = (void *)XENON_AP807},
{ .compatible = "marvell,armada-cp110-sdhci", .data = (void *)XENON_CP110},
{ .compatible = "marvell,armada-3700-sdhci", .data = (void *)XENON_A3700},
+ { .compatible = "marvell,ac5-sdhci", .data = (void *)XENON_AP806},
{}
};
MODULE_DEVICE_TABLE(of, sdhci_xenon_dt_ids);
--
2.17.1
