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| author | Jaehoon Chung <jh80.chung@samsung.com> | 2011-10-18 01:26:42 -0400 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-10-26 16:32:29 -0400 |
| commit | eb0d8f135b6730d6d0324a064664d121334290e7 (patch) | |
| tree | 74876f5d20163bb5e9b185d9357237e1f22a2262 /drivers/mmc/core/mmc.c | |
| parent | 881d1c25f765938a95def5afe39486ce39f9fc96 (diff) | |
| download | lwn-eb0d8f135b6730d6d0324a064664d121334290e7.tar.gz lwn-eb0d8f135b6730d6d0324a064664d121334290e7.zip | |
mmc: core: support HPI send command
HPI command is defined in eMMC4.41.
This feature is important for eMMC4.5 devices.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/core/mmc.c')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index de5900aa81cd..fb5bf01dd1b2 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -448,6 +448,21 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) } if (card->ext_csd.rev >= 5) { + /* check whether the eMMC card supports HPI */ + if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) { + card->ext_csd.hpi = 1; + if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2) + card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION; + else + card->ext_csd.hpi_cmd = MMC_SEND_STATUS; + /* + * Indicate the maximum timeout to close + * a command interrupted by HPI + */ + card->ext_csd.out_of_int_time = + ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10; + } + card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM]; card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION]; } @@ -896,6 +911,22 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, } /* + * Enable HPI feature (if supported) + */ + if (card->ext_csd.hpi) { + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_HPI_MGMT, 1, 0); + if (err && err != -EBADMSG) + goto free_card; + if (err) { + pr_warning("%s: Enabling HPI failed\n", + mmc_hostname(card->host)); + err = 0; + } else + card->ext_csd.hpi_en = 1; + } + + /* * Compute bus speed. */ max_dtr = (unsigned int)-1; |