diff options
Diffstat (limited to 'drivers/mmc/core/core.c')
| -rw-r--r-- | drivers/mmc/core/core.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index bffcaf8df35..bad39442f8f 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -42,6 +42,14 @@ extern int mmc_attach_sdio(struct mmc_host *host, u32 ocr); static struct workqueue_struct *workqueue; /* + * Enabling software CRCs on the data blocks can be a significant (30%) + * performance cost, and for other reasons may not always be desired. + * So we allow it it to be disabled. + */ +int use_spi_crc = 1; +module_param(use_spi_crc, bool, 0); + +/* * Internal function. Schedule delayed work in the MMC work queue. */ static int mmc_schedule_delayed_work(struct delayed_work *work, @@ -71,6 +79,11 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) struct mmc_command *cmd = mrq->cmd; int err = cmd->error; + if (err && cmd->retries && mmc_host_is_spi(host)) { + if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) + cmd->retries = 0; + } + if (err && cmd->retries) { pr_debug("%s: req failed (CMD%u): %d, retrying...\n", mmc_hostname(host), cmd->opcode, err); @@ -453,8 +466,13 @@ static void mmc_power_up(struct mmc_host *host) int bit = fls(host->ocr_avail) - 1; host->ios.vdd = bit; - host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; - host->ios.chip_select = MMC_CS_DONTCARE; + if (mmc_host_is_spi(host)) { + host->ios.chip_select = MMC_CS_HIGH; + host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; + } else { + host->ios.chip_select = MMC_CS_DONTCARE; + host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; + } host->ios.power_mode = MMC_POWER_UP; host->ios.bus_width = MMC_BUS_WIDTH_1; host->ios.timing = MMC_TIMING_LEGACY; @@ -481,8 +499,10 @@ static void mmc_power_off(struct mmc_host *host) { host->ios.clock = 0; host->ios.vdd = 0; - host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; - host->ios.chip_select = MMC_CS_DONTCARE; + if (!mmc_host_is_spi(host)) { + host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; + host->ios.chip_select = MMC_CS_DONTCARE; + } host->ios.power_mode = MMC_POWER_OFF; host->ios.bus_width = MMC_BUS_WIDTH_1; host->ios.timing = MMC_TIMING_LEGACY; |