linux-kernel - [PATCH v3 13/14] scsi: ufs: exynos: gs101: enable clock gating with hibern8

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Message-ID: <20241031150033.3440894-14-peter.griffin@linaro.org>
Date: Thu, 31 Oct 2024 15:00:32 +0000
From: Peter Griffin <peter.griffin@...aro.org>
To: alim.akhtar@...sung.com,
	James.Bottomley@...senPartnership.com,
	martin.petersen@...cle.com,
	avri.altman@....com,
	bvanassche@....org,
	krzk@...nel.org
Cc: tudor.ambarus@...aro.org,
	ebiggers@...nel.org,
	andre.draszik@...aro.org,
	kernel-team@...roid.com,
	willmcvicker@...gle.com,
	linux-scsi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Peter Griffin <peter.griffin@...aro.org>
Subject: [PATCH v3 13/14] scsi: ufs: exynos: gs101: enable clock gating with hibern8

Enable clock gating and hibern8 capabilities for gs101. This
leads to a significantly cooler phone when running the upstream
kernel.

The exynos_ufs_post_hibern8() hook is also updated to remove the
UIC_CMD_DME_HIBER_EXIT code path as this causes a hang on gs101.

The code path is removed rather than re-factored as no other SoC
in ufs-exynos driver sets UFSHCD_CAP_HIBERN8_WITH_CLK_GATING
capability. Additionally until the previous commit the hibern8
callbacks were broken anyway as they expected a bool.

Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
Reviewed-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 drivers/ufs/host/ufs-exynos.c | 24 ++++--------------------
 1 file changed, 4 insertions(+), 20 deletions(-)

diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c
index 9b6c4cfd7665..91827b3e582b 100644
--- a/drivers/ufs/host/ufs-exynos.c
+++ b/drivers/ufs/host/ufs-exynos.c
@@ -224,6 +224,9 @@ static int gs101_ufs_drv_init(struct exynos_ufs *ufs)
 	/* Enable WriteBooster */
 	hba->caps |= UFSHCD_CAP_WB_EN;
 
+	/* Enable clock gating and hibern8 */
+	hba->caps |= UFSHCD_CAP_CLK_GATING | UFSHCD_CAP_HIBERN8_WITH_CLK_GATING;
+
 	/* set ACG to be controlled by UFS_ACG_DISABLE */
 	reg = hci_readl(ufs, HCI_IOP_ACG_DISABLE);
 	hci_writel(ufs, reg & (~HCI_IOP_ACG_DISABLE_EN), HCI_IOP_ACG_DISABLE);
@@ -1563,26 +1566,7 @@ static void exynos_ufs_post_hibern8(struct ufs_hba *hba, enum uic_cmd_dme cmd)
 {
 	struct exynos_ufs *ufs = ufshcd_get_variant(hba);
 
-	if (cmd == UIC_CMD_DME_HIBER_EXIT) {
-		u32 cur_mode = 0;
-		u32 pwrmode;
-
-		if (ufshcd_is_hs_mode(&ufs->dev_req_params))
-			pwrmode = FAST_MODE;
-		else
-			pwrmode = SLOW_MODE;
-
-		ufshcd_dme_get(hba, UIC_ARG_MIB(PA_PWRMODE), &cur_mode);
-		if (cur_mode != (pwrmode << 4 | pwrmode)) {
-			dev_warn(hba->dev, "%s: power mode change\n", __func__);
-			hba->pwr_info.pwr_rx = (cur_mode >> 4) & 0xf;
-			hba->pwr_info.pwr_tx = cur_mode & 0xf;
-			ufshcd_config_pwr_mode(hba, &hba->max_pwr_info.info);
-		}
-
-		if (!(ufs->opts & EXYNOS_UFS_OPT_SKIP_CONNECTION_ESTAB))
-			exynos_ufs_establish_connt(ufs);
-	} else if (cmd == UIC_CMD_DME_HIBER_ENTER) {
+	if (cmd == UIC_CMD_DME_HIBER_ENTER) {
 		ufs->entry_hibern8_t = ktime_get();
 		exynos_ufs_gate_clks(ufs);
 		if (ufs->opts & EXYNOS_UFS_OPT_BROKEN_AUTO_CLK_CTRL)
-- 
2.47.0.163.g1226f6d8fa-goog