Messages in this thread Patch in this message | | | From | Ricky WU <> | Subject | [PATCH] mmc: rtsx: add 74 Clocks in power on flow | Date | Tue, 22 Feb 2022 07:27:52 +0000 |
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After 1ms stabilizing the voltage time add "Host provides at least 74 Clocks before issuing first command" that is spec definition
Signed-off-by: Ricky Wu <ricky_wu@realtek.com> --- drivers/mmc/host/rtsx_pci_sdmmc.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c index 2a3f14afe9f8..e016d720e453 100644 --- a/drivers/mmc/host/rtsx_pci_sdmmc.c +++ b/drivers/mmc/host/rtsx_pci_sdmmc.c @@ -940,10 +940,17 @@ 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; + /* send init 74 clocks */ + rtsx_pci_write_register(pcr, SD_BUS_STAT, SD_CLK_TOGGLE_EN, SD_CLK_TOGGLE_EN); + mdelay(5); + rtsx_pci_write_register(pcr, SD_BUS_STAT, SD_CLK_TOGGLE_EN, 0); + if (PCI_PID(pcr) == PID_5261) { /* * If test mode is set switch to SD Express mandatorily, -- 2.25.1 | |