diff options
author | Pierre Ossman <drzeus@drzeus.cx> | 2007-05-01 15:08:30 +0200 |
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committer | Pierre Ossman <drzeus@drzeus.cx> | 2007-05-01 15:08:30 +0200 |
commit | 89a73cf52ba2ae4402c53487b71ec4475544f139 (patch) | |
tree | 9ac38faa312bb5127dee2381d6c0923fe94192b1 /drivers | |
parent | 1addfcdbe4b23a20f28a097c2469d9f0c21bef23 (diff) | |
download | linux-89a73cf52ba2ae4402c53487b71ec4475544f139.tar.bz2 |
mmc: separate out reading EXT_CSD
Separate the reading and decoding of the EXT_CSD register with the
actions taken on it.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/mmc/core/mmc.c | 75 |
1 files changed, 35 insertions, 40 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index c2e120b11bef..47449e870131 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -152,10 +152,9 @@ static void mmc_decode_csd(struct mmc_card *card) } /* - * Read and decode extended CSD. Switch to high-speed and wide bus - * if supported. + * Read and decode extended CSD. */ -static int mmc_process_ext_csd(struct mmc_card *card) +static int mmc_read_ext_csd(struct mmc_card *card) { int err; u8 *ext_csd; @@ -223,39 +222,6 @@ static int mmc_process_ext_csd(struct mmc_card *card) goto out; } - if (card->host->caps & MMC_CAP_MMC_HIGHSPEED) { - /* Activate highspeed support. */ - err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, - EXT_CSD_HS_TIMING, 1); - if (err != MMC_ERR_NONE) { - printk(KERN_WARNING "%s: failed to switch " - "card to mmc v4 high-speed mode.\n", - mmc_hostname(card->host)); - err = MMC_ERR_NONE; - goto out; - } - - mmc_card_set_highspeed(card); - - mmc_set_timing(card->host, MMC_TIMING_MMC_HS); - } - - /* Check for host support for wide-bus modes. */ - if (card->host->caps & MMC_CAP_4_BIT_DATA) { - /* Activate 4-bit support. */ - err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, - EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4); - if (err != MMC_ERR_NONE) { - printk(KERN_WARNING "%s: failed to switch " - "card to mmc v4 4-bit bus mode.\n", - mmc_hostname(card->host)); - err = MMC_ERR_NONE; - goto out; - } - - mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); - } - out: kfree(ext_csd); @@ -391,19 +357,35 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr) mmc_decode_cid(card); /* - * Fetch and process extened CSD. - * This will switch into high-speed and wide bus modes, - * as available. + * Select card, as all following commands rely on that. */ err = mmc_select_card(card); if (err != MMC_ERR_NONE) goto free_card; - err = mmc_process_ext_csd(card); + /* + * Fetch and process extened CSD. + */ + err = mmc_read_ext_csd(card); if (err != MMC_ERR_NONE) goto free_card; /* + * Activate high speed (if supported) + */ + if ((card->ext_csd.hs_max_dtr != 0) && + (host->caps & MMC_CAP_MMC_HIGHSPEED)) { + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_HS_TIMING, 1); + if (err != MMC_ERR_NONE) + goto free_card; + + mmc_card_set_highspeed(card); + + mmc_set_timing(card->host, MMC_TIMING_MMC_HS); + } + + /* * Compute bus speed. */ max_dtr = (unsigned int)-1; @@ -417,6 +399,19 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr) mmc_set_clock(host, max_dtr); + /* + * Activate wide bus (if supported). + */ + if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) && + (host->caps & MMC_CAP_4_BIT_DATA)) { + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4); + if (err != MMC_ERR_NONE) + goto free_card; + + mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); + } + host->card = card; mmc_release_host(host); |