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scsi: ufs: exynos: Allow UFS Gear 4

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UFS Gear 4 offers faster speeds, and better power usage so lets enable
it.

Currently ufshcd_init_host_params() sets UFS_HS_G3 as a default, so even
if the device supports G4 we end up negotiating down to G3.

For SoCs like gs101 which have a UFS major controller version of 3 or
above advertise Gear 4. This then allows a Gear 4 link on Pixel 6.

For earlier controller versions keep the current default behaviour of
reporting G3.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Link: https://lore.kernel.org/r/20241031150033.3440894-4-peter.griffin@linaro.org
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Peter Griffin 2024-10-31 15:00:22 +00:00 committed by Martin K. Petersen
parent afd613ca2c
commit 516ceaaf53
1 changed files with 19 additions and 0 deletions
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19
drivers/ufs/host/ufs-exynos.c
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@ -766,6 +766,21 @@ static void exynos_ufs_config_sync_pattern_mask(struct exynos_ufs *ufs,
exynos_ufs_disable_ov_tm(hba);
}
#define UFS_HW_VER_MAJOR_MASK GENMASK(15, 8)
static u32 exynos_ufs_get_hs_gear(struct ufs_hba *hba)
{
u8 major;
major = FIELD_GET(UFS_HW_VER_MAJOR_MASK, hba->ufs_version);
if (major >= 3)
return UFS_HS_G4;
/* Default is HS-G3 */
return UFS_HS_G3;
}
static int exynos_ufs_pre_pwr_mode(struct ufs_hba *hba,
struct ufs_pa_layer_attr *dev_max_params,
struct ufs_pa_layer_attr *dev_req_params)
@ -783,6 +798,10 @@ static int exynos_ufs_pre_pwr_mode(struct ufs_hba *hba,
ufshcd_init_host_params(&host_params);
/* This driver only support symmetric gear setting e.g. hs_tx_gear == hs_rx_gear */
host_params.hs_tx_gear = exynos_ufs_get_hs_gear(hba);
host_params.hs_rx_gear = exynos_ufs_get_hs_gear(hba);
ret = ufshcd_negotiate_pwr_params(&host_params, dev_max_params, dev_req_params);
if (ret) {
pr_err("%s: failed to determine capabilities\n", __func__);