linux-kernel - [PATCH 0/3] Add support to reconfigure PLL

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Message-ID: <20250113-support-pll-reconfigure-v1-0-1fae6bc1062d@quicinc.com>
Date: Mon, 13 Jan 2025 22:57:03 +0530
From: Taniya Das <quic_tdas@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette
	<mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
CC: Ajit Pandey <quic_ajipan@...cinc.com>,
        Imran Shaik
	<quic_imrashai@...cinc.com>,
        Jagadeesh Kona <quic_jkona@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Taniya Das <quic_tdas@...cinc.com>
Subject: [PATCH 0/3] Add support to reconfigure PLL

During boot-up, there is a possibility that the PLL configuration might
be missed even after invoking pll_configure() from the clock controller
probe. This is often due to the PLL being connected to rail or rails
that are in an OFF state and current clock controller also cannot vote
on multiple rails. As a result, the PLL may be enabled with suboptimal
settings, leading to functional issues.

The PLL configuration, now part of clk_alpha_pll, can be reused to
reconfigure the PLL to a known good state before scaling for frequency.
The 'clk_alpha_pll_reconfigure()' can be updated to support more PLLs
in future.

The IRIS driver support added
https://lore.kernel.org/all/20241212-qcom-video-iris-v9-0-e8c2c6bd4041@quicinc.com/
observes the pll latch warning during boot up due to the dependency of
the PLL not in good state, thus add config support for SM8550 Video
clock controller PLLs.

Signed-off-by: Taniya Das <quic_tdas@...cinc.com>
---
Taniya Das (3):
      clk: qcom: clk-alpha-pll: Integrate PLL configuration into PLL structure
      clk: qcom: clk-alpha-pll: Add support to reconfigure PLL
      clk: qcom: videocc-sm8550: Update the pll config for Video PLLs

 drivers/clk/qcom/clk-alpha-pll.c  | 30 ++++++++++++++++++++++++++++++
 drivers/clk/qcom/clk-alpha-pll.h  |  2 ++
 drivers/clk/qcom/videocc-sm8550.c |  2 ++
 3 files changed, 34 insertions(+)
---
base-commit: 37136bf5c3a6f6b686d74f41837a6406bec6b7bc
change-id: 20250113-support-pll-reconfigure-9a9cbb43a90b

Best regards,
-- 
Taniya Das <quic_tdas@...cinc.com>