iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

scsi: ufs: qcom: Update MAX_CORE_CLK_1US_CYCLES for UFS V4 and above

Browse Source 
UFS Controller V4 and above, the register layout for DME_VS_CORE_CLK_CTRL
register has changed. MAX_CORE_CLK_1US_CYCLES offset has changed from 0 to
0x10 and length of attrbute is changed from 8bit to 12bit.

Add support to configure MAX_CORE_CLK_1US_CYCLES for UFS V4 and above as
per new register layout.

Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>
Link: https://lore.kernel.org/r/20230905052400.13935-2-quic_nitirawa@quicinc.com
Reviewed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Nitin Rawat 2023-09-05 10:53:56 +05:30 committed by Martin K. Petersen
parent 0bb80ecc33
commit 07d2290fe8
2 changed files with 16 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/ufs/host/ufs-qcom.c
View File

@ -1299,20 +1299,28 @@ static void ufs_qcom_exit(struct ufs_hba *hba)
static int ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(struct ufs_hba *hba,
u32 clk_cycles)
{
struct ufs_qcom_host *host = ufshcd_get_variant(hba);
int err;
u32 core_clk_ctrl_reg;
if (clk_cycles > DME_VS_CORE_CLK_CTRL_MAX_CORE_CLK_1US_CYCLES_MASK)
return -EINVAL;
err = ufshcd_dme_get(hba,
UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL),
&core_clk_ctrl_reg);
if (err)
return err;
core_clk_ctrl_reg &= ~DME_VS_CORE_CLK_CTRL_MAX_CORE_CLK_1US_CYCLES_MASK;
core_clk_ctrl_reg |= clk_cycles;
/* Bit mask is different for UFS host controller V4.0.0 onwards */
if (host->hw_ver.major >= 4) {
if (!FIELD_FIT(CLK_1US_CYCLES_MASK_V4, clk_cycles))
return -ERANGE;
core_clk_ctrl_reg &= ~CLK_1US_CYCLES_MASK_V4;
core_clk_ctrl_reg |= FIELD_PREP(CLK_1US_CYCLES_MASK_V4, clk_cycles);
} else {
if (!FIELD_FIT(CLK_1US_CYCLES_MASK, clk_cycles))
return -ERANGE;
core_clk_ctrl_reg &= ~CLK_1US_CYCLES_MASK;
core_clk_ctrl_reg |= FIELD_PREP(CLK_1US_CYCLES_MASK, clk_cycles);
}
/* Clear CORE_CLK_DIV_EN */
core_clk_ctrl_reg &= ~DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT;

5
drivers/ufs/host/ufs-qcom.h
View File

@ -129,8 +129,9 @@ enum {
#define PA_VS_CONFIG_REG1 0x9000
#define DME_VS_CORE_CLK_CTRL 0xD002
/* bit and mask definitions for DME_VS_CORE_CLK_CTRL attribute */
#define DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT BIT(8)
#define DME_VS_CORE_CLK_CTRL_MAX_CORE_CLK_1US_CYCLES_MASK 0xFF
#define CLK_1US_CYCLES_MASK_V4 GENMASK(27, 16)
#define CLK_1US_CYCLES_MASK GENMASK(7, 0)
#define DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT BIT(8)
static inline void
ufs_qcom_get_controller_revision(struct ufs_hba *hba,