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mmc: rtsx: add 74 Clocks in power on flow 

commit 1f311c94aabdb419c28e3147bcc8ab89269f1a7e upstream.

SD spec definition:
"Host provides at least 74 Clocks before issuing first command"
After 1ms for the voltage stable then start issuing the Clock signals

if POWER STATE is
MMC_POWER_OFF to MMC_POWER_UP to issue Clock signal to card
MMC_POWER_UP to MMC_POWER_ON to stop issuing signal to card

Signed-off-by: Ricky Wu <ricky_wu@realtek.com>
Link: https://lore.kernel.org/r/1badf10aba764191a1a752edcbf90389@realtek.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Christian Loehle <cloehle@hyperstone.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ricky WU 2022-03-02 09:43:01 +00:00 committed by Greg Kroah-Hartman
parent d789b98917
commit 8a7f92053d
1 changed files with 21 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/mmc/host/rtsx_pci_sdmmc.c
View File

@ -37,10 +37,7 @@ struct realtek_pci_sdmmc {
bool double_clk;
bool eject;
bool initial_mode;
int power_state;
#define SDMMC_POWER_ON 1
#define SDMMC_POWER_OFF 0
int prev_power_state;
int sg_count;
s32 cookie;
int cookie_sg_count;
@ -902,14 +899,21 @@ static int sd_set_bus_width(struct realtek_pci_sdmmc *host,
return err;
}
static int sd_power_on(struct realtek_pci_sdmmc *host)
static int sd_power_on(struct realtek_pci_sdmmc *host, unsigned char power_mode)
{
struct rtsx_pcr *pcr = host->pcr;
int err;
if (host->power_state == SDMMC_POWER_ON)
if (host->prev_power_state == MMC_POWER_ON)
return 0;
if (host->prev_power_state == MMC_POWER_UP) {
rtsx_pci_write_register(pcr, SD_BUS_STAT, SD_CLK_TOGGLE_EN, 0);
goto finish;
}
msleep(100);
rtsx_pci_init_cmd(pcr);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_SELECT, 0x07, SD_MOD_SEL);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_SHARE_MODE,
@ -928,11 +932,17 @@ static int sd_power_on(struct realtek_pci_sdmmc *host)
if (err < 0)
return err;
mdelay(1);
err = rtsx_pci_write_register(pcr, CARD_OE, SD_OUTPUT_EN, SD_OUTPUT_EN);
if (err < 0)
return err;
host->power_state = SDMMC_POWER_ON;
/* send at least 74 clocks */
rtsx_pci_write_register(pcr, SD_BUS_STAT, SD_CLK_TOGGLE_EN, SD_CLK_TOGGLE_EN);
finish:
host->prev_power_state = power_mode;
return 0;
}
@ -941,7 +951,7 @@ static int sd_power_off(struct realtek_pci_sdmmc *host)
struct rtsx_pcr *pcr = host->pcr;
int err;
host->power_state = SDMMC_POWER_OFF;
host->prev_power_state = MMC_POWER_OFF;
rtsx_pci_init_cmd(pcr);
@ -967,7 +977,7 @@ static int sd_set_power_mode(struct realtek_pci_sdmmc *host,
if (power_mode == MMC_POWER_OFF)
err = sd_power_off(host);
else
err = sd_power_on(host);
err = sd_power_on(host, power_mode);
return err;
}
@ -1402,10 +1412,11 @@ static int rtsx_pci_sdmmc_drv_probe(struct platform_device *pdev)
host = mmc_priv(mmc);
host->pcr = pcr;
mmc->ios.power_delay_ms = 5;
host->mmc = mmc;
host->pdev = pdev;
host->cookie = -1;
host->power_state = SDMMC_POWER_OFF;
host->prev_power_state = MMC_POWER_OFF;
INIT_WORK(&host->work, sd_request);
platform_set_drvdata(pdev, host);
pcr->slots[RTSX_SD_CARD].p_dev = pdev;