linux-kernel - [PATCH v2] clk: samsung: fsd: Mark PLL_CAM

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Message-Id: <20240919123954.33000-1-inbaraj.e@samsung.com>
Date: Thu, 19 Sep 2024 18:09:54 +0530
From: Inbaraj E <inbaraj.e@...sung.com>
To: krzk@...nel.org, s.nawrocki@...sung.com, cw00.choi@...sung.com,
	alim.akhtar@...sung.com, mturquette@...libre.com, sboyd@...nel.org,
	linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: pankaj.dubey@...sung.com, gost.dev@...sung.com, Inbaraj E
	<inbaraj.e@...sung.com>
Subject: [PATCH v2] clk: samsung: fsd: Mark PLL_CAM_CSI as critical

PLL_CAM_CSI is the parent clock for the ACLK and PCLK in the CMU_CAM_CSI
block. When we gate ACLK or PCLK, the clock framework will subsequently
disables the parent clocks(PLL_CAM_CSI). Disabling PLL_CAM_CSI is causing
system level halt.

It was observed on FSD SoC, when we gate the ACLK and PCLK during CSI stop
streaming through pm_runtime_put system is getting halted. So marking
PLL_CAM_CSI as critical to prevent disabling.

Fixes: b826c3e4de1a ("clk: samsung: fsd: Add cam_csi block clock information")
Signed-off-by: Inbaraj E <inbaraj.e@...sung.com>
---
 drivers/clk/samsung/clk-fsd.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/samsung/clk-fsd.c b/drivers/clk/samsung/clk-fsd.c
index 6f984cfcd33c..d62981e4b1d6 100644
--- a/drivers/clk/samsung/clk-fsd.c
+++ b/drivers/clk/samsung/clk-fsd.c
@@ -1637,8 +1637,13 @@ static const struct samsung_pll_rate_table pll_cam_csi_rate_table[] __initconst
 };
 
 static const struct samsung_pll_clock cam_csi_pll_clks[] __initconst = {
-	PLL(pll_142xx, 0, "fout_pll_cam_csi", "fin_pll",
-	    PLL_LOCKTIME_PLL_CAM_CSI, PLL_CON0_PLL_CAM_CSI, pll_cam_csi_rate_table),
+	/*
+	 * PLL_CAM_CSI will never be turned off because PLL_CAM_CSI is
+	 * supplying clock to CMU SFR of CAM_CSI block.
+	 */
+	__PLL(pll_142xx, 0, "fout_pll_cam_csi", "fin_pll",
+		CLK_GET_RATE_NOCACHE | CLK_IS_CRITICAL, PLL_LOCKTIME_PLL_CAM_CSI,
+		PLL_CON0_PLL_CAM_CSI, pll_cam_csi_rate_table),
 };
 
 PNAME(mout_cam_csi_pll_p) = { "fin_pll", "fout_pll_cam_csi" };
-- 
2.17.1