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Date: Thu, 2 Oct 2008 12:56:32 +0100
From: "Matt Fleming" <mattjfleming@...glemail.com>
To: linux-kernel@...r.kernel.org,
"Pierre Ossman" <drzeus-mmc@...eus.cx>
Subject: [PATCH 1/2] MMC: Use timeout values from CSR
>From 6c6e19a6554753edc4e25827cd0873ad512192e4 Mon Sep 17 00:00:00 2001
From: Matthew Fleming <matthew.fleming@...tec.com>
Date: Thu, 2 Oct 2008 12:21:42 +0100
Subject: [PATCH 1/2] MMC: Use timeout values from CSR
Hard-coded timeout values of 250ms for writes and 100ms for reads are
currently used for MMC transactions over SPI. The spec states that the
timeout values from the card should be used.
Signed-off-by: Matthew Fleming <matthew.fleming@...tec.com>
---
drivers/mmc/host/mmc_spi.c | 32 +++++++++++++++++++++-----------
1 files changed, 21 insertions(+), 11 deletions(-)
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 7503b81..07faf54 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 timeout)
{
struct spi_device *spi = host->spi;
int status, i;
@@ -673,7 +672,7 @@ mmc_spi_writeblock(struct mmc_spi_host *host,
struct spi_transfer *t)
if (scratch->status[i] != 0)
return 0;
}
- return mmc_spi_wait_unbusy(host, writeblock_timeout);
+ return mmc_spi_wait_unbusy(host, timeout);
}
/*
@@ -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 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, timeout);
if (status == SPI_TOKEN_SINGLE) {
if (host->dma_dev) {
@@ -778,6 +778,8 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct
mmc_command *cmd,
struct scatterlist *sg;
unsigned n_sg;
int multiple = (data->blocks > 1);
+ u32 clock_rate;
+ ktime_t timeout;
if (data->flags & MMC_DATA_READ)
direction = DMA_FROM_DEVICE;
@@ -786,6 +788,14 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct
mmc_command *cmd,
mmc_spi_setup_data_message(host, multiple, direction);
t = &host->t;
+ if (t->speed_hz)
+ clock_rate = t->speed_hz;
+ else
+ clock_rate = spi->max_speed_hz;
+
+ timeout = ktime_add_ns(ktime_set(0, 0), data->timeout_ns +
+ data->timeout_clks * 1000000 / clock_rate);
+
/* Handle scatterlist segments one at a time, with synch for
* each 512-byte block
*/
@@ -832,9 +842,9 @@ 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, timeout);
else
- status = mmc_spi_readblock(host, t);
+ status = mmc_spi_readblock(host, t, timeout);
if (status < 0)
break;
@@ -917,7 +927,7 @@ 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, timeout);
if (tmp < 0 && !data->error)
data->error = tmp;
}
--
1.5.5.2
View attachment "0001-MMC-Use-timeout-values-from-CSR.patch" of type "text/x-diff" (4135 bytes)
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