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scsi: ufs: host: mediatek: Fine-tune clock scaling

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Disable clock scaling for UFS versions below 4.0. Clock scaling is
unnecessary for these versions, and this change ensures that the feature
is only enabled for compatible UFS versions.

Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Link: https://lore.kernel.org/r/20250811131423.3444014-5-peter.wang@mediatek.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Peter Wang 2025-08-11 21:11:20 +08:00 committed by Martin K. Petersen
parent f91c6c70d1
commit 86a678a251
1 changed files with 13 additions and 0 deletions
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13
drivers/ufs/host/ufs-mediatek.c
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@ -29,6 +29,7 @@
#include "ufs-mediatek-sip.h"
static int ufs_mtk_config_mcq(struct ufs_hba *hba, bool irq);
static void _ufs_mtk_clk_scale(struct ufs_hba *hba, bool scale_up);
#define CREATE_TRACE_POINTS
#include "ufs-mediatek-trace.h"
@ -1144,6 +1145,17 @@ static void ufs_mtk_fix_ahit(struct ufs_hba *hba)
ufs_mtk_setup_clk_gating(hba);
}
static void ufs_mtk_fix_clock_scaling(struct ufs_hba *hba)
{
/* UFS version is below 4.0, clock scaling is not necessary */
if ((hba->dev_info.wspecversion < 0x0400) &&
ufs_mtk_is_clk_scale_ready(hba)) {
hba->caps &= ~UFSHCD_CAP_CLK_SCALING;
_ufs_mtk_clk_scale(hba, false);
}
}
static void ufs_mtk_init_mcq_irq(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
@ -1774,6 +1786,7 @@ static void ufs_mtk_fixup_dev_quirks(struct ufs_hba *hba)
ufs_mtk_vreg_fix_vcc(hba);
ufs_mtk_vreg_fix_vccqx(hba);
ufs_mtk_fix_ahit(hba);
ufs_mtk_fix_clock_scaling(hba);
}
static void ufs_mtk_event_notify(struct ufs_hba *hba,