linux-kernel - [PATCH v2 3/5] clk: qcom: gcc-sm8150: Use ALWAYS

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Date:   Wed,  2 Mar 2022 16:35:06 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     linux-arm-msm@...r.kernel.org
Cc:     bhupesh.sharma@...aro.org, bhupesh.linux@...il.com,
        agross@...nel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, sboyd@...nel.org, tdas@...eaurora.org,
        mturquette@...libre.com, linux-clk@...r.kernel.org,
        robh+dt@...nel.org, Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: [PATCH v2 3/5] clk: qcom: gcc-sm8150: Use ALWAYS_ON flag as a workaround for emac gdsc

emac GDSC currently has issues (seen on SA8155p-ADP) when its
turn'ed ON, once its already in OFF state. So when the 'eth'
interface is turned up, it fails (as RGMII CLK is unavailable,
which is gated by emac GDSC) with the following logs:

  qcom-ethqos 20000.ethernet eth0: PHY [stmmac-0:07] driver [Micrel
                                   KSZ9031 Gigabit PHY] (irq=150)
  <..snip..>
  qcom-ethqos 20000.ethernet: Failed to reset the dma
  qcom-ethqos 20000.ethernet eth0: stmmac_hw_setup: DMA engine
                                   initialization failed
  qcom-ethqos 20000.ethernet eth0: stmmac_open: Hw setup failed

So, use the 'ALWAYS_ON' flag as a workaround to describe emac GDSC
for now.

Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
---
 drivers/clk/qcom/gcc-sm8150.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/gcc-sm8150.c b/drivers/clk/qcom/gcc-sm8150.c
index 08ba29e3a835..76485bff7240 100644
--- a/drivers/clk/qcom/gcc-sm8150.c
+++ b/drivers/clk/qcom/gcc-sm8150.c
@@ -3454,7 +3454,13 @@ static struct gdsc emac_gdsc = {
 		.name = "emac_gdsc",
 	},
 	.pwrsts = PWRSTS_OFF_ON,
-	.flags = POLL_CFG_GDSCR,
+	/*
+	 * FIXME: emac GDSC cannot resume after GDSC power off:
+	 * qcom-ethqos 20000.ethernet: Failed to reset the dma
+	 *
+	 * So use ALWAYS_ON flag as a workaround.
+	 */
+	.flags = ALWAYS_ON,
 };
 
 static struct gdsc usb30_prim_gdsc = {
-- 
2.35.1