Messages in this thread Patch in this message | | | Date | Sat, 12 Feb 2011 14:22:20 +0800 | From | Chuanxiao Dong <> | Subject | [PATCH v4 2/3]mmc: enable TRIM/ERASE caps for SDHCI host |
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SDHCI host controller has TRIM/ERASE capability, enable these caps for erasing purpose.
ERASE command needs R1B response. So for such command with busy signal, before sending command, SDHCI host driver will simply set a maximum value for timeout control register which is safe to use.
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com> --- drivers/mmc/host/sdhci.c | 16 +++++++++++----- 1 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 655617c..fe7cbd0 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -41,7 +41,6 @@ static unsigned int debug_quirks = 0; -static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *); static void sdhci_finish_data(struct sdhci_host *); static void sdhci_send_command(struct sdhci_host *, struct mmc_command *); @@ -652,16 +651,23 @@ static void sdhci_set_transfer_irqs(struct sdhci_host *host) sdhci_clear_set_irqs(host, dma_irqs, pio_irqs); } -static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data) +static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) { u8 count; u8 ctrl; + struct mmc_data *data = cmd->data; int ret; WARN_ON(host->data); - if (data == NULL) + if (data == NULL) { + /* + * set timeout to be maximum value for command with busy signal. + */ + if (cmd->flags & MMC_RSP_BUSY) + sdhci_writeb(host, 0xE, SDHCI_TIMEOUT_CONTROL); return; + } /* Sanity checks */ BUG_ON(data->blksz * data->blocks > 524288); @@ -921,7 +927,7 @@ static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd) host->cmd = cmd; - sdhci_prepare_data(host, cmd->data); + sdhci_prepare_data(host, cmd); sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT); @@ -1939,7 +1945,7 @@ int sdhci_add_host(struct sdhci_host *host) mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200; mmc->f_max = host->max_clk; - mmc->caps |= MMC_CAP_SDIO_IRQ; + mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE; /* * A controller may support 8-bit width, but the board itself -- 1.6.6.1
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