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mmc: parse new binding for eMMC fixed driver type

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Parse the new binding and store it in the host struct after doing some
sanity checks. The code is designed to support fixed SD driver type if
we ever need that.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Wolfram Sang 2017-10-15 14:46:14 +02:00 committed by Ulf Hansson
parent f7834cbd90
commit 6186d06c51
3 changed files with 22 additions and 4 deletions
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13
drivers/mmc/core/host.c
View File

@ -179,7 +179,7 @@ static void mmc_retune_timer(unsigned long data)
int mmc_of_parse(struct mmc_host *host)
{
struct device *dev = host->parent;
u32 bus_width;
u32 bus_width, drv_type;
int ret;
bool cd_cap_invert, cd_gpio_invert = false;
bool ro_cap_invert, ro_gpio_invert = false;
@ -321,6 +321,15 @@ int mmc_of_parse(struct mmc_host *host)
if (device_property_read_bool(dev, "no-mmc"))
host->caps2 |= MMC_CAP2_NO_MMC;
/* Must be after "non-removable" check */
if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
if (host->caps & MMC_CAP_NONREMOVABLE)
host->fixed_drv_type = drv_type;
else
dev_err(host->parent,
"can't use fixed driver type, media is removable\n");
}
host->dsr_req = !device_property_read_u32(dev, "dsr", &host->dsr);
if (host->dsr_req && (host->dsr & ~0xffff)) {
dev_err(host->parent,
@ -393,6 +402,8 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
host->max_blk_size = 512;
host->max_blk_count = PAGE_SIZE / 512;
host->fixed_drv_type = -EINVAL;
return host;
}

11
drivers/mmc/core/mmc.c
View File

@ -1291,13 +1291,18 @@ int mmc_hs400_to_hs200(struct mmc_card *card)
static void mmc_select_driver_type(struct mmc_card *card)
{
int card_drv_type, drive_strength, drv_type;
int fixed_drv_type = card->host->fixed_drv_type;
card_drv_type = card->ext_csd.raw_driver_strength |
mmc_driver_type_mask(0);
drive_strength = mmc_select_drive_strength(card,
card->ext_csd.hs200_max_dtr,
card_drv_type, &drv_type);
if (fixed_drv_type >= 0)
drive_strength = card_drv_type & mmc_driver_type_mask(fixed_drv_type)
? fixed_drv_type : 0;
else
drive_strength = mmc_select_drive_strength(card,
card->ext_csd.hs200_max_dtr,
card_drv_type, &drv_type);
card->drive_strength = drive_strength;

2
include/linux/mmc/host.h
View File

@ -354,6 +354,8 @@ struct mmc_host {
#define MMC_CAP2_CQE (1 << 23) /* Has eMMC command queue engine */
#define MMC_CAP2_CQE_DCMD (1 << 24) /* CQE can issue a direct command */
int fixed_drv_type; /* fixed driver type for non-removable media */
mmc_pm_flag_t pm_caps; /* supported pm features */
/* host specific block data */