diff options
author | Kishon Vijay Abraham I <kishon@ti.com> | 2018-04-27 14:47:17 +0300 |
---|---|---|
committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-05-03 10:36:20 +0300 |
commit | fc1fa1b7db27546803905feef403cedf40ca027a (patch) | |
tree | d649284a31fde36d72e46bd18e3f7ce7917f997c /drivers/mmc/host/sdhci.c | |
parent | 0bb28d738fb2066b314d0fe2eccffd1cab59517b (diff) | |
download | linux-fc1fa1b7db27546803905feef403cedf40ca027a.tar.xz |
mmc: sdhci: Program a relatively accurate SW timeout value
sdhci has a 10 second timeout to catch devices that stop responding.
In the case of quirk SDHCI_QUIRK2_DISABLE_HW_TIMEOUT, instead of
programming 10 second arbitrary value, calculate the total time it would
take for the entire transfer to happen and program the timeout value
accordingly.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/sdhci.c')
-rw-r--r-- | drivers/mmc/host/sdhci.c | 52 |
1 files changed, 45 insertions, 7 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index b229354e5b88..1c828e0e9905 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -738,6 +738,39 @@ static unsigned int sdhci_target_timeout(struct sdhci_host *host, return target_timeout; } +static void sdhci_calc_sw_timeout(struct sdhci_host *host, + struct mmc_command *cmd) +{ + struct mmc_data *data = cmd->data; + struct mmc_host *mmc = host->mmc; + struct mmc_ios *ios = &mmc->ios; + unsigned char bus_width = 1 << ios->bus_width; + unsigned int blksz; + unsigned int freq; + u64 target_timeout; + u64 transfer_time; + + target_timeout = sdhci_target_timeout(host, cmd, data); + target_timeout *= NSEC_PER_USEC; + + if (data) { + blksz = data->blksz; + freq = host->mmc->actual_clock ? : host->clock; + transfer_time = (u64)blksz * NSEC_PER_SEC * (8 / bus_width); + do_div(transfer_time, freq); + /* multiply by '2' to account for any unknowns */ + transfer_time = transfer_time * 2; + /* calculate timeout for the entire data */ + host->data_timeout = data->blocks * target_timeout + + transfer_time; + } else { + host->data_timeout = target_timeout; + } + + if (host->data_timeout) + host->data_timeout += MMC_CMD_TRANSFER_TIME; +} + static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd, bool *too_big) { @@ -831,6 +864,7 @@ static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd) if (too_big && host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT) { + sdhci_calc_sw_timeout(host, cmd); sdhci_set_data_timeout_irq(host, false); } else if (!(host->ier & SDHCI_INT_DATA_TIMEOUT)) { sdhci_set_data_timeout_irq(host, true); @@ -845,6 +879,8 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) u8 ctrl; struct mmc_data *data = cmd->data; + host->data_timeout = 0; + if (sdhci_data_line_cmd(cmd)) sdhci_set_timeout(host, cmd); @@ -1198,13 +1234,6 @@ void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd) mdelay(1); } - timeout = jiffies; - if (!cmd->data && cmd->busy_timeout > 9000) - timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ; - else - timeout += 10 * HZ; - sdhci_mod_timer(host, cmd->mrq, timeout); - host->cmd = cmd; if (sdhci_data_line_cmd(cmd)) { WARN_ON(host->data_cmd); @@ -1244,6 +1273,15 @@ void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd) cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200) flags |= SDHCI_CMD_DATA; + timeout = jiffies; + if (host->data_timeout) + timeout += nsecs_to_jiffies(host->data_timeout); + else if (!cmd->data && cmd->busy_timeout > 9000) + timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ; + else + timeout += 10 * HZ; + sdhci_mod_timer(host, cmd->mrq, timeout); + sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND); } EXPORT_SYMBOL_GPL(sdhci_send_command); |