linux-kernel - [PATCH 5.4 103/453] drm/msm/dsi_pll_10nm: restore VCO rate during restore

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Message-Id: <20201228124942.175453910@linuxfoundation.org>
Date:   Mon, 28 Dec 2020 13:45:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 103/453] drm/msm/dsi_pll_10nm: restore VCO rate during restore_state

From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

[ Upstream commit a4ccc37693a271330a46208afbeaed939d54fdbb ]

PHY disable/enable resets PLL registers to default values. Thus in
addition to restoring several registers we also need to restore VCO rate
settings.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Fixes: c6659785dfb3 ("drm/msm/dsi/pll: call vco set rate explicitly")
Signed-off-by: Rob Clark <robdclark@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c
index aa9385d5bfff9..33033b94935ed 100644
--- a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c
+++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c
@@ -559,6 +559,7 @@ static int dsi_pll_10nm_restore_state(struct msm_dsi_pll *pll)
 	struct pll_10nm_cached_state *cached = &pll_10nm->cached_state;
 	void __iomem *phy_base = pll_10nm->phy_cmn_mmio;
 	u32 val;
+	int ret;
 
 	val = pll_read(pll_10nm->mmio + REG_DSI_10nm_PHY_PLL_PLL_OUTDIV_RATE);
 	val &= ~0x3;
@@ -573,6 +574,13 @@ static int dsi_pll_10nm_restore_state(struct msm_dsi_pll *pll)
 	val |= cached->pll_mux;
 	pll_write(phy_base + REG_DSI_10nm_PHY_CMN_CLK_CFG1, val);
 
+	ret = dsi_pll_10nm_vco_set_rate(&pll->clk_hw, pll_10nm->vco_current_rate, pll_10nm->vco_ref_clk_rate);
+	if (ret) {
+		DRM_DEV_ERROR(&pll_10nm->pdev->dev,
+			"restore vco rate failed. ret=%d\n", ret);
+		return ret;
+	}
+
 	DBG("DSI PLL%d", pll_10nm->id);
 
 	return 0;
-- 
2.27.0