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path: root/drivers/mmc/imxmmc.c
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Diffstat (limited to 'drivers/mmc/imxmmc.c')
-rw-r--r--drivers/mmc/imxmmc.c24
1 files changed, 14 insertions, 10 deletions
diff --git a/drivers/mmc/imxmmc.c b/drivers/mmc/imxmmc.c
index 79358e223f57..a4eb1d0e7a71 100644
--- a/drivers/mmc/imxmmc.c
+++ b/drivers/mmc/imxmmc.c
@@ -218,8 +218,10 @@ static int imxmci_busy_wait_for_status(struct imxmci_host *host,
if(!loops)
return 0;
- dev_info(mmc_dev(host->mmc), "busy wait for %d usec in %s, STATUS = 0x%x (0x%x)\n",
- loops, where, *pstat, stat_mask);
+ /* The busy-wait is expected there for clock <8MHz due to SDHC hardware flaws */
+ if(!(stat_mask & STATUS_END_CMD_RESP) || (host->mmc->ios.clock>=8000000))
+ dev_info(mmc_dev(host->mmc), "busy wait for %d usec in %s, STATUS = 0x%x (0x%x)\n",
+ loops, where, *pstat, stat_mask);
return loops;
}
@@ -333,6 +335,9 @@ static void imxmci_start_cmd(struct imxmci_host *host, struct mmc_command *cmd,
WARN_ON(host->cmd != NULL);
host->cmd = cmd;
+ /* Ensure, that clock are stopped else command programming and start fails */
+ imxmci_stop_clock(host);
+
if (cmd->flags & MMC_RSP_BUSY)
cmdat |= CMD_DAT_CONT_BUSY;
@@ -553,7 +558,7 @@ static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
int trans_done = 0;
unsigned int stat = *pstat;
- if(host->actual_bus_width == MMC_BUS_WIDTH_4)
+ if(host->actual_bus_width != MMC_BUS_WIDTH_4)
burst_len = 16;
else
burst_len = 64;
@@ -591,8 +596,7 @@ static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
stat = MMC_STATUS;
/* Flush extra bytes from FIFO */
- while(flush_len >= 2){
- flush_len -= 2;
+ while(flush_len && !(stat & STATUS_DATA_TRANS_DONE)){
i = MMC_BUFFER_ACCESS;
stat = MMC_STATUS;
stat &= ~STATUS_CRC_READ_ERR; /* Stupid but required there */
@@ -746,10 +750,6 @@ static void imxmci_tasklet_fnc(unsigned long data)
data_dir_mask = STATUS_DATA_TRANS_DONE;
}
- imxmci_busy_wait_for_status(host, &stat,
- data_dir_mask,
- 50, "imxmci_tasklet_fnc data");
-
if(stat & data_dir_mask) {
clear_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
imxmci_data_done(host, stat);
@@ -865,7 +865,11 @@ static void imxmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
imxmci_stop_clock(host);
MMC_CLK_RATE = (prescaler<<3) | clk;
- imxmci_start_clock(host);
+ /*
+ * Under my understanding, clock should not be started there, because it would
+ * initiate SDHC sequencer and send last or random command into card
+ */
+ /*imxmci_start_clock(host);*/
dev_dbg(mmc_dev(host->mmc), "MMC_CLK_RATE: 0x%08x\n", MMC_CLK_RATE);
} else {
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