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rockchip: sdhci: rk3568: bypass DLL when clk <= 52 MHz

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For Rockchip platform, DLL bypass bit and start bit need to be set if
DLL is not locked.

With this change applied eMMC in my NanoPi R5S can run at 52 MHz.

Based on linux commit b75a52b0dda3 ("mmc: sdhci-of-dwcmshc: Update DLL
and pre-change delay for rockchip platform")

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Vasily Khoruzhick 2023-03-08 17:28:30 -08:00 committed by Kever Yang
parent 9fe2e4ab93
commit 2321a991bb
1 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/mmc/rockchip_sdhci.c
View File

@ -61,6 +61,7 @@
#define DWCMSHC_EMMC_DLL_RXCLK 0x804
#define DWCMSHC_EMMC_DLL_TXCLK 0x808
#define DWCMSHC_EMMC_DLL_STRBIN 0x80c
#define DECMSHC_EMMC_DLL_CMDOUT 0x810
#define DWCMSHC_EMMC_DLL_STATUS0 0x840
#define DWCMSHC_EMMC_DLL_STATUS1 0x844
#define DWCMSHC_EMMC_DLL_START BIT(0)
@ -69,6 +70,7 @@
#define DWCMSHC_EMMC_DLL_START_DEFAULT 5
#define DWCMSHC_EMMC_DLL_INC_VALUE 2
#define DWCMSHC_EMMC_DLL_INC 8
#define DWCMSHC_EMMC_DLL_BYPASS BIT(24)
#define DWCMSHC_EMMC_DLL_DLYENA BIT(27)
#define DLL_TXCLK_TAPNUM_DEFAULT 0xA
@ -83,6 +85,7 @@
#define DWCMSHC_EMMC_DLL_TIMEOUT BIT(9)
#define DLL_RXCLK_NO_INVERTER 1
#define DLL_RXCLK_INVERTER 0
#define DLL_RXCLK_ORI_GATE BIT(31)
#define DWCMSHC_ENHANCED_STROBE BIT(8)
#define DLL_LOCK_WO_TMOUT(x) \
((((x) & DWCMSHC_EMMC_DLL_LOCKED) == DWCMSHC_EMMC_DLL_LOCKED) && \
@ -348,10 +351,14 @@ static int rk3568_sdhci_emmc_set_clock(struct sdhci_host *host, unsigned int clo
DLL_STRBIN_TAPNUM_FROM_SW;
sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_STRBIN);
} else {
/* reset the clock phase when the frequency is lower than 100MHz */
sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_CTRL);
extra = DLL_RXCLK_NO_INVERTER << DWCMSHC_EMMC_DLL_RXCLK_SRCSEL;
sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_RXCLK);
/*
* Disable DLL and reset both of sample and drive clock.
* The bypass bit and start bit need to be set if DLL is not locked.
*/
sdhci_writel(host, DWCMSHC_EMMC_DLL_BYPASS | DWCMSHC_EMMC_DLL_START,
DWCMSHC_EMMC_DLL_CTRL);
sdhci_writel(host, DLL_RXCLK_ORI_GATE, DWCMSHC_EMMC_DLL_RXCLK);
sdhci_writel(host, 0, DECMSHC_EMMC_DLL_CMDOUT);
sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_TXCLK);
/*
* Before switching to hs400es mode, the driver will enable