| Message ID | 20241025131442.112862-10-peter.griffin@linaro.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | UFS cleanups and enhancements to ufs-exynos for gs101 | expand |
On 10/25/24 2:14 PM, Peter Griffin wrote: > HCI_IOP_ACG_DISABLE is an undocumented register in the TRM but the > downstream driver sets this register so we follow suit here. > > The register is already 0 presumed to be set by the bootloader as > the comment downstream implies the reset state is 1. So whilst this > is a nop currently, it should help with suspend/resume. It should help in case the bootloader changes I assume. I see gs101_ufs_drv_init() gets called only at probe time, via ufshcd_pltfrm_init(). > > Signed-off-by: Peter Griffin <peter.griffin@linaro.org> Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org> > --- > drivers/ufs/host/ufs-exynos.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c > index b0cbb147c7a1..fa4e61f152c4 100644 > --- a/drivers/ufs/host/ufs-exynos.c > +++ b/drivers/ufs/host/ufs-exynos.c > @@ -76,6 +76,10 @@ > #define CLK_CTRL_EN_MASK (REFCLK_CTRL_EN |\ > UNIPRO_PCLK_CTRL_EN |\ > UNIPRO_MCLK_CTRL_EN) > + > +#define HCI_IOP_ACG_DISABLE 0x100 > +#define HCI_IOP_ACG_DISABLE_EN BIT(0) > + > /* Device fatal error */ > #define DFES_ERR_EN BIT(31) > #define DFES_DEF_L2_ERRS (UIC_DATA_LINK_LAYER_ERROR_RX_BUF_OF |\ > @@ -220,10 +224,15 @@ static int exynos_ufs_shareability(struct exynos_ufs *ufs) > static int gs101_ufs_drv_init(struct device *dev, struct exynos_ufs *ufs) > { > struct ufs_hba *hba = ufs->hba; > + u32 reg; > > /* Enable WriteBooster */ > hba->caps |= UFSHCD_CAP_WB_EN; > > + /* set ACG to be controlled by UFS_ACG_DISABLE */ > + reg = hci_readl(ufs, HCI_IOP_ACG_DISABLE); > + hci_writel(ufs, reg & (~HCI_IOP_ACG_DISABLE_EN), HCI_IOP_ACG_DISABLE); > + > return exynos_ufs_shareability(ufs); > } >
diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c index b0cbb147c7a1..fa4e61f152c4 100644 --- a/drivers/ufs/host/ufs-exynos.c +++ b/drivers/ufs/host/ufs-exynos.c @@ -76,6 +76,10 @@ #define CLK_CTRL_EN_MASK (REFCLK_CTRL_EN |\ UNIPRO_PCLK_CTRL_EN |\ UNIPRO_MCLK_CTRL_EN) + +#define HCI_IOP_ACG_DISABLE 0x100 +#define HCI_IOP_ACG_DISABLE_EN BIT(0) + /* Device fatal error */ #define DFES_ERR_EN BIT(31) #define DFES_DEF_L2_ERRS (UIC_DATA_LINK_LAYER_ERROR_RX_BUF_OF |\ @@ -220,10 +224,15 @@ static int exynos_ufs_shareability(struct exynos_ufs *ufs) static int gs101_ufs_drv_init(struct device *dev, struct exynos_ufs *ufs) { struct ufs_hba *hba = ufs->hba; + u32 reg; /* Enable WriteBooster */ hba->caps |= UFSHCD_CAP_WB_EN; + /* set ACG to be controlled by UFS_ACG_DISABLE */ + reg = hci_readl(ufs, HCI_IOP_ACG_DISABLE); + hci_writel(ufs, reg & (~HCI_IOP_ACG_DISABLE_EN), HCI_IOP_ACG_DISABLE); + return exynos_ufs_shareability(ufs); }
HCI_IOP_ACG_DISABLE is an undocumented register in the TRM but the downstream driver sets this register so we follow suit here. The register is already 0 presumed to be set by the bootloader as the comment downstream implies the reset state is 1. So whilst this is a nop currently, it should help with suspend/resume. Signed-off-by: Peter Griffin <peter.griffin@linaro.org> --- drivers/ufs/host/ufs-exynos.c | 9 +++++++++ 1 file changed, 9 insertions(+)