From: Adrian Hunter adrian.hunter@intel.com
[ Upstream commit c763729a10e538d997744317cf4a1c4f25266066 ]
Currently, ufshcd-pci is the only UFS driver with support for suspend-to-disk PM callbacks (i.e. freeze/thaw/restore/poweroff). These callbacks are set by the macro SET_SYSTEM_SLEEP_PM_OPS to the same functions as system suspend/resume. That will work with spm_lvl 5 because spm_lvl 5 will result in a full restore for the ->restore() callback. In the absence of a full restore, the host controller registers will have values set up by the restore kernel (the kernel that boots and loads the restore image) which are not necessarily the same. However it turns out, the only registers that sometimes need restore are the base address registers. This has gone un-noticed because, depending on IOMMU settings, the kernel can end up allocating the same addresses every time.
For Intel controllers, an spm_lvl other than 5 can be used, so to support S4 (suspend-to-disk) with spm_lvl other than 5, restore the base address registers.
Link: https://lore.kernel.org/r/20201207083120.26732-2-adrian.hunter@intel.com Signed-off-by: Adrian Hunter adrian.hunter@intel.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/ufs/ufshcd-pci.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c index df3a564c3e334..360c25f1f061a 100644 --- a/drivers/scsi/ufs/ufshcd-pci.c +++ b/drivers/scsi/ufs/ufshcd-pci.c @@ -163,6 +163,24 @@ static void ufs_intel_common_exit(struct ufs_hba *hba) intel_ltr_hide(hba->dev); }
+static int ufs_intel_resume(struct ufs_hba *hba, enum ufs_pm_op op) +{ + /* + * To support S4 (suspend-to-disk) with spm_lvl other than 5, the base + * address registers must be restored because the restore kernel can + * have used different addresses. + */ + ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr), + REG_UTP_TRANSFER_REQ_LIST_BASE_L); + ufshcd_writel(hba, upper_32_bits(hba->utrdl_dma_addr), + REG_UTP_TRANSFER_REQ_LIST_BASE_H); + ufshcd_writel(hba, lower_32_bits(hba->utmrdl_dma_addr), + REG_UTP_TASK_REQ_LIST_BASE_L); + ufshcd_writel(hba, upper_32_bits(hba->utmrdl_dma_addr), + REG_UTP_TASK_REQ_LIST_BASE_H); + return 0; +} + static int ufs_intel_ehl_init(struct ufs_hba *hba) { hba->quirks |= UFSHCD_QUIRK_BROKEN_AUTO_HIBERN8; @@ -174,6 +192,7 @@ static struct ufs_hba_variant_ops ufs_intel_cnl_hba_vops = { .init = ufs_intel_common_init, .exit = ufs_intel_common_exit, .link_startup_notify = ufs_intel_link_startup_notify, + .resume = ufs_intel_resume, };
static struct ufs_hba_variant_ops ufs_intel_ehl_hba_vops = { @@ -181,6 +200,7 @@ static struct ufs_hba_variant_ops ufs_intel_ehl_hba_vops = { .init = ufs_intel_ehl_init, .exit = ufs_intel_common_exit, .link_startup_notify = ufs_intel_link_startup_notify, + .resume = ufs_intel_resume, };
#ifdef CONFIG_PM_SLEEP