joel16/android_kernel_sony_msm8994_rework
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mmc: separate out reading EXT_CSD

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Separate the reading and decoding of the EXT_CSD register with the
actions taken on it.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman 2007-05-01 15:08:30 +02:00
parent 1addfcdbe4
commit 89a73cf52b
1 changed files with 35 additions and 40 deletions
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75
drivers/mmc/core/mmc.c
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@ -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);
@ -391,18 +357,34 @@ 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.
*/
@ -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);