[PATCH v6 00/10] phy: rockchip: samsung-hdptx: Clock fixes and API transition cleanups

[Cristian Ciocaltea]

This series provides a set of bug fixes and cleanups for the Rockchip
Samsung HDPTX PHY driver.

The first part of the series addresses clock rate calculation and
synchronization issues.  Specifically, it fixes edge cases where the PHY
PLL is pre-programmed by an external component (like a bootloader) or
when changing the color depth (bpc) while keeping the modeline constant.
Because the Common Clock Framework .set_rate() callback might not be
invoked if the pixel clock remains unchanged, this previously led to
out-of-sync states between CCF and the actual HDMI PHY configuration.

The second part focuses on code cleanups and modernizing the register
access.  Now that dw_hdmi_qp driver has fully switched to using
phy_configure(), we can drop the deprecated TMDS rate setup workarounds
and the restrict_rate_change flag logic.  Finally, it refactors the
driver to consistently use standard bitfield macros.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
---
Changes in v6:
- Collected R-b tags from Mani
- Documented the expected recovery from invalid PLL hardware state in
  patches 2 & 3 (Vinod)
- Updated patch 5 description to avoid mentioning 'patches' (Mani)
- Rebased series onto latest phy/next
- Link to v5: https://patch.msgid.link/20260723-hdptx-clk-fixes-v5-0-8e786067865f@xxxxxxxxxxxxx

Changes in v5:
- Collected R-b/T-b tags from Dmitry, Andy & Diederik
- Added new patch to guard against clk rate integer underflow (Sashiko)
- Updated debug message in "Prevent divide-by-zero when computing clk
  rate" to be consistent with the one introduced in the "underflow"
  patch above
- Added separate patch to consolidate consumer_put in
  rk_hdptx_phy_power_on() error path (Dmitry)
- Rebased series onto latest phy/next
- Link to v4: https://patch.msgid.link/20260612-hdptx-clk-fixes-v4-0-ce5e1d456cda@xxxxxxxxxxxxx

Changes in v4:
- Added new patches to address new findings from Sashiko:
  * Prevent divide-by-zero when computing clk rate
  * Fix rate recalculation for 3.2GHz FRL
- Updated patch "Consistently use bitfield macros" to handle a few more
  bit operations
- Link to v3: https://patch.msgid.link/20260611-hdptx-clk-fixes-v3-0-67b1b0c00e16@xxxxxxxxxxxxx

Changes in v3:
- Replaced div_u64() with DIV_ROUND_CLOSEST_ULL() in Patch 1 (Sashiko)
- Fixed theoretical usage_count unbalanced issue in Patch 2 (Sashiko)
- Rebased series onto latest phy/next
- Link to v2: https://patch.msgid.link/20260511-hdptx-clk-fixes-v2-0-664e41379cab@xxxxxxxxxxxxx

Changes in v2:
- Collected Tested-by tags from Thomas and Simon
- Fixed a typo in commit description of patch 1
- Added a comment in patch 2 explaining why PLL config errors are
  ignored for rk_hdptx_phy_consumer_get()
- Added a missed FIELD_GET conversion for lcpll_hw.pms_sdiv in patch 6
- Rebased onto latest phy/fixes
- Link to v1: https://lore.kernel.org/r/20260227-hdptx-clk-fixes-v1-0-f998f2762d0f@xxxxxxxxxxxxx

---
Cristian Ciocaltea (10):
      phy: rockchip: samsung-hdptx: Fix rate recalculation for high bpc
      phy: rockchip: samsung-hdptx: Prevent divide-by-zero when computing clk rate
      phy: rockchip: samsung-hdptx: Guard against clk rate integer underflow
      phy: rockchip: samsung-hdptx: Fix rate recalculation for 3.2GHz FRL
      phy: rockchip: samsung-hdptx: Handle uncommitted PHY config changes
      phy: rockchip: samsung-hdptx: Drop TMDS rate setup workaround
      phy: rockchip: samsung-hdptx: Consolidate consumer_put on error path
      phy: rockchip: samsung-hdptx: Drop restrict_rate_change handling
      phy: rockchip: samsung-hdptx: Simplify GRF access with FIELD_PREP_WM16()
      phy: rockchip: samsung-hdptx: Consistently use bitfield macros

 drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c | 285 +++++++++++-----------
 1 file changed, 147 insertions(+), 138 deletions(-)
---
base-commit: 9e953732c3ed02b19698bf4af05396a3573681e1
change-id: 20260227-hdptx-clk-fixes-47426632f862