mmc: rtsx: add 74 Clocks in power on flow

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>
This commit is contained in:
Ricky WU 2022-03-02 09:43:01 +00:00 committed by Ulf Hansson
parent a4ee79063f
commit 1f311c94aa
1 changed files with 19 additions and 10 deletions

View File

@ -38,10 +38,7 @@ 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;
@ -905,7 +902,7 @@ 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;
struct mmc_host *mmc = host->mmc;
@ -913,9 +910,14 @@ static int sd_power_on(struct realtek_pci_sdmmc *host)
u32 val;
u8 test_mode;
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);
@ -936,10 +938,15 @@ 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;
/* send at least 74 clocks */
rtsx_pci_write_register(pcr, SD_BUS_STAT, SD_CLK_TOGGLE_EN, SD_CLK_TOGGLE_EN);
if (PCI_PID(pcr) == PID_5261) {
/*
* If test mode is set switch to SD Express mandatorily,
@ -964,7 +971,8 @@ static int sd_power_on(struct realtek_pci_sdmmc *host)
}
}
host->power_state = SDMMC_POWER_ON;
finish:
host->prev_power_state = power_mode;
return 0;
}
@ -973,7 +981,7 @@ 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);
@ -999,7 +1007,7 @@ 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;
}
@ -1482,10 +1490,11 @@ 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;