From: Diwakar Sharma <diwakar.sharma@xxxxxxxxxxxx>
This patch adds a quirk to reduce clock rate for "SDR104" mode on
IMX side for Marvell 8887 WiFi + Bluetooth chip side, as Marvell
does not recommend to use SDIO at the speed of higher than 150MHz.
Signed-off-by: Diwakar Sharma <diwakar.sharma@xxxxxxxxxxxx>
[Harish: Reduced SDIO clock of SDR104 to 150MHz]
Signed-off-by: Harish Jenny K N <harish_kandiga@xxxxxxxxxx>
---
drivers/mmc/core/card.h | 5 +++++
drivers/mmc/core/quirks.h | 3 +++
drivers/mmc/core/sdio.c | 21 +++++++++++++++++++++
include/linux/mmc/card.h | 4 ++++
include/linux/mmc/sdio_ids.h | 1 +
5 files changed, 34 insertions(+)
diff --git a/drivers/mmc/core/card.h b/drivers/mmc/core/card.h
index 9c821ee..e6c7dad 100644
--- a/drivers/mmc/core/card.h
+++ b/drivers/mmc/core/card.h
@@ -221,4 +221,9 @@ static inline int mmc_card_broken_hpi(const struct mmc_card *c)
return c->quirks & MMC_QUIRK_BROKEN_HPI;
}
+static inline int mmc_card_broken_uhs(const struct mmc_card *c)
+{
+ return c->quirks & MMC_QUIRK_BROKEN_UHS;
+}
+
#endif
diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h
index 5153577..575b6f7 100644
--- a/drivers/mmc/core/quirks.h
+++ b/drivers/mmc/core/quirks.h
@@ -132,6 +132,9 @@
SDIO_FIXUP(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8797_F0,
add_quirk, MMC_QUIRK_BROKEN_IRQ_POLLING),
+ SDIO_FIXUP(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8887WLAN,
+ add_quirk, MMC_QUIRK_BROKEN_UHS),
+
END_FIXUP
};
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index c599a62..4389f57 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -444,6 +444,8 @@ static int sdio_set_bus_speed_mode(struct mmc_card *card)
unsigned int bus_speed, timing;
int err;
unsigned char speed;
+ int cccr_vsn;
+ unsigned char data;
/*
* If the host doesn't support any of the UHS-I modes, fallback on
@@ -460,6 +462,25 @@ static int sdio_set_bus_speed_mode(struct mmc_card *card)
timing = MMC_TIMING_UHS_SDR104;
card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
+
+ err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR,
+ 0, &data);
+ if (err)
+ return err;
+
+ cccr_vsn = data & 0x0f;
+ if (cccr_vsn >= SDIO_CCCR_REV_3_00) {
+ if (mmc_host_uhs(card->host) &&
+ mmc_card_broken_uhs(card)) {
+ /*
+ * Reduce the max clock rate to
+ * 150MHz for SD_MODE_UHS_SDR104.
+ */
+ card->sw_caps.uhs_max_dtr =
+ UHS_SDR104_REDUCED_DTR;
+ }
+ }
+
} else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
(card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
bus_speed = SDIO_SPEED_DDR50;
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 279b390..ccb29f8 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -268,6 +268,10 @@ struct mmc_card {
#define MMC_QUIRK_BROKEN_IRQ_POLLING (1<<11) /* Polling SDIO_CCCR_INTx could create a fake interrupt */
#define MMC_QUIRK_TRIM_BROKEN (1<<12) /* Skip trim */
#define MMC_QUIRK_BROKEN_HPI (1<<13) /* Disable broken HPI support */
+#define MMC_QUIRK_BROKEN_UHS (1<<14) /* Report a lower SDIO clock rate */
+ /* for broken UHS */
+
+#define UHS_SDR104_REDUCED_DTR 150000000
bool reenable_cmdq; /* Re-enable Command Queue */
diff --git a/include/linux/mmc/sdio_ids.h b/include/linux/mmc/sdio_ids.h
index cdd66a5..00e18e2 100644
--- a/include/linux/mmc/sdio_ids.h
+++ b/include/linux/mmc/sdio_ids.h
@@ -55,6 +55,7 @@
#define SDIO_DEVICE_ID_MARVELL_8688WLAN 0x9104
#define SDIO_DEVICE_ID_MARVELL_8688BT 0x9105
#define SDIO_DEVICE_ID_MARVELL_8797_F0 0x9128
+#define SDIO_DEVICE_ID_MARVELL_8887WLAN 0x9134
#define SDIO_VENDOR_ID_SIANO 0x039a
#define SDIO_DEVICE_ID_SIANO_NOVA_B0 0x0201
--
1.9.1
--
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