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mmc: core: Read performance enhancements registers for SD cards

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In SD spec v6.x the SD function extension registers for performance
enhancements were introduced. These registers let the SD card announce
supports for various performance related features, like "self-maintenance",
"cache" and "command queuing".

Let's extend the parsing of SD function extension registers and store the
information in the struct mmc_card. This prepares for subsequent changes to
implement the complete support for new the performance enhancement
features.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Link: https://lore.kernel.org/r/20210504161222.101536-11-ulf.hansson@linaro.org
This commit is contained in:
Ulf Hansson 2021-05-04 18:12:21 +02:00
parent c784f92769
commit 4e6306e0b8
2 changed files with 60 additions and 0 deletions
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53
drivers/mmc/core/sd.c
View File

@ -1058,6 +1058,55 @@ out:
return err;
}
static int sd_parse_ext_reg_perf(struct mmc_card *card, u8 fno, u8 page,
u16 offset)
{
int err;
u8 *reg_buf;
reg_buf = kzalloc(512, GFP_KERNEL);
if (!reg_buf)
return -ENOMEM;
err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf);
if (err) {
pr_warn("%s: error %d reading PERF func of ext reg\n",
mmc_hostname(card->host), err);
goto out;
}
/* PERF revision. */
card->ext_perf.rev = reg_buf[0];
/* FX_EVENT support at bit 0. */
if (reg_buf[1] & BIT(0))
card->ext_perf.feature_support |= SD_EXT_PERF_FX_EVENT;
/* Card initiated self-maintenance support at bit 0. */
if (reg_buf[2] & BIT(0))
card->ext_perf.feature_support |= SD_EXT_PERF_CARD_MAINT;
/* Host initiated self-maintenance support at bit 1. */
if (reg_buf[2] & BIT(1))
card->ext_perf.feature_support |= SD_EXT_PERF_HOST_MAINT;
/* Cache support at bit 0. */
if (reg_buf[4] & BIT(0))
card->ext_perf.feature_support |= SD_EXT_PERF_CACHE;
/* Command queue support indicated via queue depth bits (0 to 4). */
if (reg_buf[6] & 0x1f)
card->ext_perf.feature_support |= SD_EXT_PERF_CMD_QUEUE;
card->ext_perf.fno = fno;
card->ext_perf.page = page;
card->ext_perf.offset = offset;
out:
kfree(reg_buf);
return err;
}
static int sd_parse_ext_reg(struct mmc_card *card, u8 *gen_info_buf,
u16 *next_ext_addr)
{
@ -1102,6 +1151,10 @@ static int sd_parse_ext_reg(struct mmc_card *card, u8 *gen_info_buf,
if (sfc == 0x1)
return sd_parse_ext_reg_power(card, fno, page, offset);
/* Standard Function Code for performance enhancement. */
if (sfc == 0x2)
return sd_parse_ext_reg_perf(card, fno, page, offset);
return 0;
}

7
include/linux/mmc/card.h
View File

@ -201,6 +201,12 @@ struct sd_ext_reg {
#define SD_EXT_POWER_OFF_NOTIFY (1<<0)
#define SD_EXT_POWER_SUSTENANCE (1<<1)
#define SD_EXT_POWER_DOWN_MODE (1<<2)
/* Performance Enhancement Function. */
#define SD_EXT_PERF_FX_EVENT (1<<0)
#define SD_EXT_PERF_CARD_MAINT (1<<1)
#define SD_EXT_PERF_HOST_MAINT (1<<2)
#define SD_EXT_PERF_CACHE (1<<3)
#define SD_EXT_PERF_CMD_QUEUE (1<<4)
};
struct sdio_cccr {
@ -305,6 +311,7 @@ struct mmc_card {
struct sd_ssr ssr; /* yet more SD information */
struct sd_switch_caps sw_caps; /* switch (CMD6) caps */
struct sd_ext_reg ext_power; /* SD extension reg for PM */
struct sd_ext_reg ext_perf; /* SD extension reg for PERF */
unsigned int sdio_funcs; /* number of SDIO functions */
atomic_t sdio_funcs_probed; /* number of probed SDIO funcs */