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From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: benl-kernelpatches@squareup.com
Cc: airlied@linux.ie, benl@squareup.com, daniel@ffwll.ch,
	dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
	harigovi@codeaurora.org, kholk11@gmail.com,
	konradybcio@gmail.com, linux-arm-msm@vger.kernel.org,
	linux-kernel@vger.kernel.org, robdclark@gmail.com,
	sean@poorly.run, zhengbin13@huawei.com
Subject: [PATCH] drm/msm/dsi: do not try reading 28nm vco rate if it's not enabled
Date: Fri, 30 Oct 2020 18:12:07 +0300	[thread overview]
Message-ID: <20201030151207.766857-1-dmitry.baryshkov@linaro.org> (raw)
In-Reply-To: <010101750064e17e-3db0087e-fc37-494d-aac9-2c2b9b0a7c5b-000000@us-west-2.amazonses.com>

Reading VCO rate for this PLL can cause boot stalls, if it is not
enabled. Guard clk_hw_get_rate with a call to
dsi_pll_28nm_clk_is_enabled().

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c
index 6dffd7f4a99b..37a1f996a588 100644
--- a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c
+++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c
@@ -447,7 +447,10 @@ static void dsi_pll_28nm_save_state(struct msm_dsi_pll *pll)
 	cached_state->postdiv1 =
 			pll_read(base + REG_DSI_28nm_PHY_PLL_POSTDIV1_CFG);
 	cached_state->byte_mux = pll_read(base + REG_DSI_28nm_PHY_PLL_VREG_CFG);
-	cached_state->vco_rate = clk_hw_get_rate(&pll->clk_hw);
+	if (dsi_pll_28nm_clk_is_enabled(&pll->clk_hw))
+		cached_state->vco_rate = clk_hw_get_rate(&pll->clk_hw);
+	else
+		cached_state->vco_rate = 0;
 }
 
 static int dsi_pll_28nm_restore_state(struct msm_dsi_pll *pll)
-- 
2.28.0


  parent reply	other threads:[~2020-10-30 15:12 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-07  0:10 [PATCH] drm/msm/dsi: save PLL registers across first PHY reset benl-kernelpatches
2020-10-30 13:55 ` Dmitry Baryshkov
2021-01-30  2:00   ` Benjamin Li
2021-01-30 16:16     ` Dmitry Baryshkov
2020-10-30 15:12 ` Dmitry Baryshkov [this message]
2020-12-29 20:15   ` [PATCH] drm/msm/dsi: do not try reading 28nm vco rate if it's not enabled patchwork-bot+linux-arm-msm
2021-05-15  0:33 ` [PATCH] drm/msm/dsi: save PLL registers across first PHY reset Dmitry Baryshkov

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