When the sdhci-cap-speed-modes-broken DT property is set, the driver
will ignore the bits of the capability registers that correspond to
speed modes.
Signed-off-by: Zach Brown <zach.brown@xxxxxx>
---
drivers/mmc/host/sdhci.c | 25 +++++++++++++++++++++++--
1 file changed, 23 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 1e25b01..a17c47e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -22,6 +22,7 @@
#include <linux/scatterlist.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>
+#include <linux/of.h>
#include <linux/leds.h>
@@ -2991,6 +2992,7 @@ static int sdhci_set_dma_mask(struct sdhci_host *host)
void __sdhci_read_caps(struct sdhci_host *host, u16 *ver, u32 *caps, u32 *caps1)
{
u16 v;
+ unsigned int speed_cap_broken = false;
if (host->read_caps)
return;
@@ -3005,18 +3007,37 @@ void __sdhci_read_caps(struct sdhci_host *host, u16 *ver, u32 *caps, u32 *caps1)
sdhci_do_reset(host, SDHCI_RESET_ALL);
+ if (of_property_read_bool(mmc_dev(host->mmc)->of_node,
+ "sdhci-cap-speed-modes-broken"))
+ speed_cap_broken = true;
+
v = ver ? *ver : sdhci_readw(host, SDHCI_HOST_VERSION);
host->version = (v & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
if (host->quirks & SDHCI_QUIRK_MISSING_CAPS)
return;
- host->caps = caps ? *caps : sdhci_readl(host, SDHCI_CAPABILITIES);
+ if (caps)
+ host->caps = *caps;
+ else {
+ host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
+ if (speed_cap_broken)
+ host->caps &= ~SDHCI_CAN_DO_HISPD;
+ }
if (host->version < SDHCI_SPEC_300)
return;
- host->caps1 = caps1 ? *caps1 : sdhci_readl(host, SDHCI_CAPABILITIES_1);
+ if (caps1)
+ host->caps1 = *caps1;
+ else {
+ host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
+ if (speed_cap_broken)
+ host->caps1 &= ~(SDHCI_SUPPORT_SDR50 |
+ SDHCI_SUPPORT_SDR104 |
+ SDHCI_SUPPORT_DDR50 |
+ SDHCI_SUPPORT_HS400);
+ }
}
EXPORT_SYMBOL_GPL(__sdhci_read_caps);
--
2.7.4
--
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