linux-kernel - [PATCH v4 0/4] drm/msm/dsi/phy: Improvements around concurrent PHY_CMN_CLK

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Message-Id: <20250217-drm-msm-phy-pll-cfg-reg-v4-0-106b0d1df51e@linaro.org>
Date: Mon, 17 Feb 2025 12:53:13 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Jonathan Marek <jonathan@...ek.ca>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Rob Clark <robdclark@...omium.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v4 0/4] drm/msm/dsi/phy: Improvements around concurrent
 PHY_CMN_CLK_CFG[01]

Changes in v4:
- Add tags
- Patch #4: Add mising bitfield.h include
- One more FIELD_GET and DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL (Dmitry)
- Link to v3: https://lore.kernel.org/r/20250214-drm-msm-phy-pll-cfg-reg-v3-0-0943b850722c@linaro.org

Changes in v3:
- Define bitfields in patches 1-3, so move there parts from patch #4
- Use FIELD_GET
- Keep separate cached->bit_clk_div and pix_clk_div
- I think this implements entire feedback from Dmitry
- Link to v2: https://lore.kernel.org/r/20250203-drm-msm-phy-pll-cfg-reg-v2-0-862b136c5d22@linaro.org

Changes in v2:
- Add Fixes tag
- New patch #4
- Link to v1: https://lore.kernel.org/r/20250131-drm-msm-phy-pll-cfg-reg-v1-0-3b99efeb2e8d@linaro.org

Calling these improvements, not fixes, because I don't think we ever hit
actual concurrency issue.  Although if we ever hit it, it would be very
tricky to debug and find the cause.

Best regards,
Krzysztof

---
Krzysztof Kozlowski (4):
      drm/msm/dsi/phy: Protect PHY_CMN_CLK_CFG0 updated from driver side
      drm/msm/dsi/phy: Protect PHY_CMN_CLK_CFG1 against clock driver
      drm/msm/dsi/phy: Do not overwite PHY_CMN_CLK_CFG1 when choosing bitclk source
      drm/msm/dsi/phy: Define PHY_CMN_CLK_CFG[01] bitfields and simplify saving

 drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c          | 64 +++++++++++++++-------
 .../gpu/drm/msm/registers/display/dsi_phy_7nm.xml  | 12 +++-
 2 files changed, 53 insertions(+), 23 deletions(-)
---
base-commit: 883d3876ff4bb50d1b9431f525b4d3b257ead6f5
change-id: 20250131-drm-msm-phy-pll-cfg-reg-7e5bf5aa9df6

Best regards,
-- 
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>