omap hsmmc controller IP has an inbuilt timer that can be programmed to
guard against unresponsive operations. But it's range is very narrow,
and it's maximum countable time is a few seconds.
Card maintenance operations like BKOPS and SECURE DISCARD and long
stream writes like packed command require timers of order of
several minutes.
So get rid of using the IP timer entirely and use kernel's hrtimer
functionality for guarding the device operations.
As part of this change, a workaround that disabled timeouts for
MMC_ERASE commands is removed, and the arbitary timing of 100ms
is used only when the timeout is not explicitly specified by core.
Signed-off-by: Venkatraman S <svenk...@ti.com>
---
drivers/mmc/host/omap_hsmmc.c | 96 ++++++++++++++++++++++---------------------
1 file changed, 50 insertions(+), 46 deletions(-)
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 9afdd20..8f7cebc 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -79,7 +79,7 @@
#define CLKD_SHIFT 6
#define DTO_MASK 0x000F0000
#define DTO_SHIFT 16
-#define INT_EN_MASK 0x307F0033
+#define INT_EN_MASK 0x306E0033
#define BWR_ENABLE (1 << 4)
#define BRR_ENABLE (1 << 5)
#define DTO_ENABLE (1 << 20)
@@ -160,6 +160,7 @@ struct omap_hsmmc_host {
unsigned int dma_sg_idx;
unsigned char bus_mode;
unsigned char power_mode;
+ unsigned int ns_per_clk_cycle;
int suspended;
int irq;
int use_dma, dma_ch;
@@ -172,6 +173,7 @@ struct omap_hsmmc_host {
int reqs_blocked;
int use_reg;
int req_in_progress;
+ struct hrtimer guard_timer;
struct omap_hsmmc_next next_data;
struct omap_mmc_platform_data *pdata;
@@ -455,10 +457,6 @@ static void omap_hsmmc_enable_irq(struct omap_hsmmc_host
*host,
else
irq_mask = INT_EN_MASK;
- /* Disable timeout for erases */
- if (cmd->opcode == MMC_ERASE)
- irq_mask &= ~DTO_ENABLE;
-
OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
@@ -508,6 +506,9 @@ static void omap_hsmmc_set_clock(struct omap_hsmmc_host
*host)
&& time_before(jiffies, timeout))
cpu_relax();
+ if (ios->clock)
+ host->ns_per_clk_cycle = DIV_ROUND_UP(NSEC_PER_SEC, ios->clock);
+
omap_hsmmc_start_clock(host);
}
@@ -824,7 +825,7 @@ omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct
mmc_data *data)
omap_hsmmc_request_done(host, mrq);
return;
}
-
+ hrtimer_cancel(&host->guard_timer);
host->data = NULL;
if (!data->error)
@@ -859,8 +860,11 @@ omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct
mmc_command *cmd)
cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
}
}
- if ((host->data == NULL && !host->response_busy) || cmd->error)
+ if ((host->data == NULL && !host->response_busy) || cmd->error) {
+ if (cmd->error != -ETIMEDOUT)
+ hrtimer_cancel(&host->guard_timer);
omap_hsmmc_request_done(host, cmd->mrq);
+ }
}
/*
@@ -992,7 +996,7 @@ static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host,
int status)
hsmmc_command_incomplete(host, -EILSEQ);
end_cmd = 1;
- if (host->data || host->response_busy) {
+ if (data || host->response_busy) {
end_trans = 1;
host->response_busy = 0;
}
@@ -1292,41 +1296,35 @@ static int omap_hsmmc_start_dma_transfer(struct
omap_hsmmc_host *host,
return 0;
}
-static void set_data_timeout(struct omap_hsmmc_host *host,
- unsigned int timeout_ns,
- unsigned int timeout_clks)
+static void set_guard_timer(struct omap_hsmmc_host *host,
+ unsigned long timeout_ms, unsigned long timeout_ns,
+ unsigned int timeout_clks)
{
- unsigned int timeout, cycle_ns;
- uint32_t reg, clkd, dto = 0;
+ ktime_t gtime;
+ unsigned int sec, nsec;
- reg = OMAP_HSMMC_READ(host->base, SYSCTL);
- clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
- if (clkd == 0)
- clkd = 1;
+ sec = timeout_ms / MSEC_PER_SEC;
+ nsec = (timeout_ms % MSEC_PER_SEC) * NSEC_PER_MSEC + timeout_ns;
- cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
- timeout = timeout_ns / cycle_ns;
- timeout += timeout_clks;
- if (timeout) {
- while ((timeout & 0x80000000) == 0) {
- dto += 1;
- timeout <<= 1;
- }
- dto = 31 - dto;
- timeout <<= 1;
- if (timeout && dto)
- dto += 1;
- if (dto >= 13)
- dto -= 13;
- else
- dto = 0;
- if (dto > 14)
- dto = 14;
- }
+ nsec += timeout_clks * host->ns_per_clk_cycle;
+ gtime = ktime_set(sec, nsec);
- reg &= ~DTO_MASK;
- reg |= dto << DTO_SHIFT;
- OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
+ hrtimer_start(&host->guard_timer, gtime, HRTIMER_MODE_REL);
+}
+
+enum hrtimer_restart omap_hsmmc_timedout(struct hrtimer *gtimer)
+{
+ struct omap_hsmmc_host *host;
+ host = container_of(gtimer, struct omap_hsmmc_host, guard_timer);
+
+ omap_hsmmc_disable_irq(host);
+ hsmmc_command_incomplete(host, -ETIMEDOUT);
+ host->response_busy = 0;
+ omap_hsmmc_cmd_done(host, host->cmd);
+ if (host->data)
+ omap_hsmmc_xfer_done(host, host->data);
+
+ return HRTIMER_NORESTART;
}
/*
@@ -1340,18 +1338,22 @@ omap_hsmmc_prepare_data(struct omap_hsmmc_host *host,
struct mmc_request *req)
if (req->data == NULL) {
OMAP_HSMMC_WRITE(host->base, BLK, 0);
- /*
- * Set an arbitrary 100ms data timeout for commands with
- * busy signal.
- */
- if (req->cmd->flags & MMC_RSP_BUSY)
- set_data_timeout(host, 100000000U, 0);
+ if (req->cmd->cmd_timeout_ms == 0) {
+ /*
+ * Set an arbitrary 100ms data timeout for commands with
+ * busy signal.
+ */
+ set_guard_timer(host, 100, 0, 0);
+ } else {
+ set_guard_timer(host, req->cmd->cmd_timeout_ms, 0, 0);
+ }
return 0;
}
OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
| (req->data->blocks << 16));
- set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks);
+ set_guard_timer(host, 0, req->data->timeout_ns,
+ req->data->timeout_clks);
if (host->use_dma) {
ret = omap_hsmmc_start_dma_transfer(host, req);
@@ -1921,6 +1923,8 @@ static int __devinit omap_hsmmc_probe(struct
platform_device *pdev)
pdata->suspend = omap_hsmmc_suspend_cdirq;
pdata->resume = omap_hsmmc_resume_cdirq;
}
+ hrtimer_init(&host->guard_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ host->guard_timer.function = omap_hsmmc_timedout;
omap_hsmmc_disable_irq(host);
--
1.7.11.1.25.g0e18bef
--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
