Currently just AXIDMA_RWDATA_BURST_LEN[3:0] field is set to 8
in exynos_ufs_post_link() function.
To enable WLU transaction additionally we need to set Write Line
Unique enable [31], Write Line Unique Burst Length [30:27] and
AXIDMA_RWDATA_BURST_LEN[3:0].
To support WLU transaction on gs101, both burst length fields need
to be 0x3. As all other SoCs expect the current value we update this
in the gs101_ufs_post_link() specific hook.
Signed-off-by: Peter Griffin <peter.griffin@xxxxxxxxxx>
Reviewed-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx>
---
v3: fix typo s/burth/burst typo (Tudor)
v3: update commit message (Peter)
---
drivers/ufs/host/ufs-exynos.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c
index d59e1933b64e..78307440107f 100644
--- a/drivers/ufs/host/ufs-exynos.c
+++ b/drivers/ufs/host/ufs-exynos.c
@@ -48,6 +48,8 @@
#define HCI_UNIPRO_APB_CLK_CTRL 0x68
#define UNIPRO_APB_CLK(v, x) (((v) & ~0xF) | ((x) & 0xF))
#define HCI_AXIDMA_RWDATA_BURST_LEN 0x6C
+#define WLU_EN BIT(31)
+#define WLU_BURST_LEN(x) ((x) << 27 | ((x) & 0xF))
#define HCI_GPIO_OUT 0x70
#define HCI_ERR_EN_PA_LAYER 0x78
#define HCI_ERR_EN_DL_LAYER 0x7C
@@ -1922,6 +1924,12 @@ static int gs101_ufs_post_link(struct exynos_ufs *ufs)
{
struct ufs_hba *hba = ufs->hba;
+ /*
+ * Enable Write Line Unique. This field has to be 0x3
+ * to support Write Line Unique transaction on gs101.
+ */
+ hci_writel(ufs, WLU_EN | WLU_BURST_LEN(3), HCI_AXIDMA_RWDATA_BURST_LEN);
+
exynos_ufs_enable_dbg_mode(hba);
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_SAVECONFIGTIME), 0x3e8);
exynos_ufs_disable_dbg_mode(hba);
--
2.47.0.163.g1226f6d8fa-goog
