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Date: Wed, 24 Sep 2008 12:16:02 +0100
From: "Matt Fleming" <mattjfleming@...glemail.com>
To: "Pierre Ossman" <drzeus-mmc@...eus.cx>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] MMC: Use write timeout value as read from CSR
2008/9/20 Pierre Ossman <drzeus-mmc@...eus.cx>:
>
> It shouldn't take that long to write the more proper solution, so get
> to it and it should be possible to get in even for .27.
>
OK, attached is the latest attempt at this patch. Because a lot of
host drivers manipulate timeout_ns and timeout_clks I decided not
touch them at all. So, I created a new member of the mmc_data struct
that has the timeout value as a ktime_t. I'm still unsure of how
exactly to tackle the mmc_send_cid and mmc_send_csd() cases, the
timeout value used in the spec is Ncr, where can I find this value?
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 044d84e..b5c6f5f 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -249,8 +249,10 @@ void mmc_set_data_timeout(struct mmc_data *data,
const struct mmc_card *card)
* SDIO cards only define an upper 1 s limit on access.
*/
if (mmc_card_sdio(card)) {
- data->timeout_ns = 1000000000;
- data->timeout_clks = 0;
+ if (data->timeout_ns > 1000000000) {
+ data->timeout_ns = 1000000000;
+ data->timeout_clks = 0;
+ }
return;
}
@@ -269,6 +271,11 @@ void mmc_set_data_timeout(struct mmc_data *data,
const struct mmc_card *card)
data->timeout_ns = card->csd.tacc_ns * mult;
data->timeout_clks = card->csd.tacc_clks * mult;
+ data->ktimeout = ktime_set(0, 0);
+ data->ktimeout = ktime_add_ns(data->ktimeout, data->timeout_ns);
+ data->ktimeout = ktime_add_ns(data->ktimeout,
+ data->timeout_clks * 1000000 / card->host->ios.clock);
+
/*
* SD cards also have an upper limit on the timeout.
*/
@@ -290,6 +297,8 @@ void mmc_set_data_timeout(struct mmc_data *data,
const struct mmc_card *card)
if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
data->timeout_ns = limit_us * 1000;
data->timeout_clks = 0;
+ data->ktimeout = ktime_add_ns(ktime_set(0, 0),
+ data->timeout_ns);
}
}
}
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 7503b81..cdeb2e5 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -95,8 +95,6 @@
* reads which takes nowhere near that long. Older cards may be able to use
* shorter timeouts ... but why bother?
*/
-#define readblock_timeout ktime_set(0, 100 * 1000 * 1000)
-#define writeblock_timeout ktime_set(0, 250 * 1000 * 1000)
#define r1b_timeout ktime_set(3, 0)
@@ -220,9 +218,9 @@ mmc_spi_wait_unbusy(struct mmc_spi_host *host,
ktime_t timeout)
return mmc_spi_skip(host, timeout, sizeof(host->data->status), 0);
}
-static int mmc_spi_readtoken(struct mmc_spi_host *host)
+static int mmc_spi_readtoken(struct mmc_spi_host *host, ktime_t timeout)
{
- return mmc_spi_skip(host, readblock_timeout, 1, 0xff);
+ return mmc_spi_skip(host, timeout, 1, 0xff);
}
@@ -605,7 +603,8 @@ mmc_spi_setup_data_message(
* Return negative errno, else success.
*/
static int
-mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t)
+mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t,
+ ktime_t writeblock_timeout)
{
struct spi_device *spi = host->spi;
int status, i;
@@ -693,7 +692,8 @@ mmc_spi_writeblock(struct mmc_spi_host *host,
struct spi_transfer *t)
* STOP_TRANSMISSION command.
*/
static int
-mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t)
+mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t,
+ ktime_t readblock_timeout)
{
struct spi_device *spi = host->spi;
int status;
@@ -707,7 +707,7 @@ mmc_spi_readblock(struct mmc_spi_host *host,
struct spi_transfer *t)
return status;
status = scratch->status[0];
if (status == 0xff || status == 0)
- status = mmc_spi_readtoken(host);
+ status = mmc_spi_readtoken(host, readblock_timeout);
if (status == SPI_TOKEN_SINGLE) {
if (host->dma_dev) {
@@ -832,9 +832,11 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct
mmc_command *cmd,
t->len);
if (direction == DMA_TO_DEVICE)
- status = mmc_spi_writeblock(host, t);
+ status = mmc_spi_writeblock(host, t,
+ data->ktimeout);
else
- status = mmc_spi_readblock(host, t);
+ status = mmc_spi_readblock(host, t,
+ data->ktimeout);
if (status < 0)
break;
@@ -917,7 +919,7 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct
mmc_command *cmd,
if (scratch->status[tmp] != 0)
return;
}
- tmp = mmc_spi_wait_unbusy(host, writeblock_timeout);
+ tmp = mmc_spi_wait_unbusy(host, data->ktimeout);
if (tmp < 0 && !data->error)
data->error = tmp;
}
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 143cebf..e518391 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -10,6 +10,7 @@
#include <linux/interrupt.h>
#include <linux/device.h>
+#include <linux/ktime.h>
struct request;
struct mmc_data;
@@ -99,6 +100,7 @@ struct mmc_command {
struct mmc_data {
unsigned int timeout_ns; /* data timeout (in
ns, max 80ms) */
unsigned int timeout_clks; /* data timeout (in clocks) */
+ ktime_t ktimeout; /* data timeout */
unsigned int blksz; /* data block size */
unsigned int blocks; /* number of blocks */
unsigned int error; /* data error */
View attachment "mmc-for-pierre-use-ktime.patch" of type "text/x-diff" (4591 bytes)
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