This patch changes the fifo reset code to follow the reset procedure
outlined in the documentation of Synopsys Mobile storage host databook.
Signed-off-by: Sonny Rao <sonnyrao@xxxxxxxxxxxx>
Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@xxxxxxxxxxx>
---
v2: Add Generic DMA support
per the documentation, move interrupt clear before wait
make the test for DMA host->use_dma rather than host->using_dma
add proper return values (although it appears no caller checks)
v3: rename fifo reset function, and change callers
use this combined reset function in dw_mci_resume()
just one caller left (probe), so get rid of dw_mci_ctrl_all_reset()
use DMA reset bit for all systems which use DMA
remove extra IDMAC reset in dw_mci_work_routine_card()
do CIU clock update in error path, if CIU reset cleared
drivers/mmc/host/dw_mmc.c | 85 +++++++++++++++++++++++++++++++++++------------
drivers/mmc/host/dw_mmc.h | 1 +
2 files changed, 64 insertions(+), 22 deletions(-)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 55cd110..988492c 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -111,8 +111,7 @@ static const u8 tuning_blk_pattern_8bit[] = {
0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
};
-static inline bool dw_mci_fifo_reset(struct dw_mci *host);
-static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host);
+static inline bool dw_mci_reset(struct dw_mci *host);
#if defined(CONFIG_DEBUG_FS)
static int dw_mci_req_show(struct seq_file *s, void *v)
@@ -1254,7 +1253,7 @@ static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data)
* After an error, there may be data lingering
* in the FIFO
*/
- dw_mci_fifo_reset(host);
+ dw_mci_reset(host);
} else {
data->bytes_xfered = data->blocks * data->blksz;
data->error = 0;
@@ -1371,7 +1370,7 @@ static void dw_mci_tasklet_func(unsigned long priv)
/* CMD error in data command */
if (mrq->cmd->error && mrq->data)
- dw_mci_fifo_reset(host);
+ dw_mci_reset(host);
host->cmd = NULL;
host->data = NULL;
@@ -1982,14 +1981,9 @@ static void dw_mci_work_routine_card(struct work_struct *work)
}
/* Power down slot */
- if (present == 0) {
+ if (present == 0)
/* Clear down the FIFO */
- dw_mci_fifo_reset(host);
-#ifdef CONFIG_MMC_DW_IDMAC
- dw_mci_idmac_reset(host);
-#endif
-
- }
+ dw_mci_reset(host);
spin_unlock_bh(&host->lock);
@@ -2323,8 +2317,11 @@ static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset)
return false;
}
-static inline bool dw_mci_fifo_reset(struct dw_mci *host)
+static inline bool dw_mci_reset(struct dw_mci *host)
{
+ u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET;
+ bool ret = false;
+
/*
* Reseting generates a block interrupt, hence setting
* the scatter-gather pointer to NULL.
@@ -2334,15 +2331,57 @@ static inline bool dw_mci_fifo_reset(struct dw_mci *host)
host->sg = NULL;
}
- return dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET);
-}
+ if (host->use_dma)
+ flags |= SDMMC_CTRL_DMA_RESET;
-static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host)
-{
- return dw_mci_ctrl_reset(host,
- SDMMC_CTRL_FIFO_RESET |
- SDMMC_CTRL_RESET |
- SDMMC_CTRL_DMA_RESET);
+ if (dw_mci_ctrl_reset(host, flags)) {
+ /*
+ * In all cases we clear the RAWINTS register to clear any
+ * interrupts.
+ */
+ mci_writel(host, RINTSTS, 0xFFFFFFFF);
+
+ /* if using dma we wait for dma_req to clear */
+ if (host->use_dma) {
+ unsigned long timeout = jiffies + msecs_to_jiffies(500);
+ u32 status;
+ do {
+ status = mci_readl(host, STATUS);
+ if (!(status & SDMMC_STATUS_DMA_REQ))
+ break;
+ cpu_relax();
+ } while (time_before(jiffies, timeout));
+
+ if (status & SDMMC_STATUS_DMA_REQ) {
+ dev_err(host->dev,
+ "%s: Timeout waiting for dma_req to "
+ "clear during reset", __func__);
+ goto ciu_out;
+ }
+
+ /* when using DMA next we reset the fifo again */
+ if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET))
+ goto ciu_out;
+ }
+ } else {
+ dev_err(host->dev, "%s: Reset bits didn't clear", __func__);
+
+ /* if the controller reset bit did clear, then set clock regs */
+ if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET))
+ goto ciu_out;
+ }
+
+ if (IS_ENABLED(CONFIG_MMC_DW_IDMAC))
+ /* It is also recommended that we reset and reprogram idmac */
+ dw_mci_idmac_reset(host);
+
+ ret = true;
+
+ciu_out:
+ /* After a CTRL reset we need to have CIU set clock registers */
+ mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0);
+
+ return ret;
}
#ifdef CONFIG_OF
@@ -2432,6 +2471,7 @@ int dw_mci_probe(struct dw_mci *host)
const struct dw_mci_drv_data *drv_data = host->drv_data;
int width, i, ret = 0;
u32 fifo_size;
+ u32 flags;
int init_slots = 0;
if (!host->pdata) {
@@ -2555,7 +2595,8 @@ int dw_mci_probe(struct dw_mci *host)
}
/* Reset all blocks */
- if (!dw_mci_ctrl_all_reset(host))
+ flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET | SDMMC_CTRL_DMA_RESET;
+ if (!dw_mci_ctrl_reset(host, flags))
return -ENODEV;
host->dma_ops = host->pdata->dma_ops;
@@ -2744,7 +2785,7 @@ int dw_mci_resume(struct dw_mci *host)
}
}
- if (!dw_mci_ctrl_all_reset(host)) {
+ if (!dw_mci_reset(host)) {
ret = -ENODEV;
return ret;
}
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index 6bf24ab..2505804 100644
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -129,6 +129,7 @@
#define SDMMC_CMD_INDX(n) ((n) & 0x1F)
/* Status register defines */
#define SDMMC_GET_FCNT(x) (((x)>>17) & 0x1FFF)
+#define SDMMC_STATUS_DMA_REQ BIT(31)
/* FIFOTH register defines */
#define SDMMC_SET_FIFOTH(m, r, t) (((m) & 0x7) << 28 | \
((r) & 0xFFF) << 16 | \
--
1.8.3.2
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