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robh@kernel.org; krzk+dt@kernel.org; >>> conor+dt@kernel.org; miquel.raynal@bootlin.com; richard@nod.at; >>> vigneshr@ti.com; pratyush@kernel.org; mwalle@kernel.org; >>> takahiro.kuwano@infineon.com >>> Cc: linux-spi@vger.kernel.org; devicetree@vger.kernel.org; linux- >>> kernel@vger.kernel.org; linux-mtd@lists.infradead.org; praneeth@ti.com; u- >>> kumar1@ti.com; a-dutta@ti.com; s-k6@ti.com >>> Subject: [PATCH v4 00/16] spi: cadence-quadspi: add PHY tuning support >>> >>> This series implements PHY tuning support for the Cadence QSPI controller to >>> enable reliable high-speed operations. Without PHY tuning, controllers use >>> conservative timing that limits performance. PHY tuning calibrates RX/TX >>> delay lines >>> to find optimal data capture timing windows, enabling operation up to the >>> controller's >>> maximum frequency. >>> >>> Background: >>> High-speed SPI memory controllers require precise timing calibration for >>> reliable >>> operation. At higher frequencies, board-to-board variations make fixed timing >>> parameters inadequate. The Cadence QSPI controller includes a PHY interface with >>> programmable delay lines (0-127 taps) for RX and TX paths, but these require >>> runtime calibration to find the valid timing window. >>> >>> Approach: >>> Add SDR/DDR PHY tuning algorithms for the Cadence controller: >>> >>> SDR Mode Tuning (1D search): >>>   - Searches for two consecutive valid RX delay windows >>>   - Selects the larger window and uses its midpoint for maximum margin >>>   - TX delay fixed at maximum (127) as it's less critical in SDR >>> >>> DDR Mode Tuning (2D search): >>>   - Finds RX boundaries (rxlow/rxhigh) using TX window sweeps >>>   - Finds TX boundaries (txlow/txhigh) at fixed RX positions >>>   - Defines valid region corners and detects gaps via binary search >>>   - Applies temperature compensation for optimal point selection >>>   - Handles single or dual passing regions with different strategies >> >> Thank you for this series. I had a question regarding the Virtual Concat >> driver patch series [1]. Now that it has been merged into the kernel and >> enables support for multiple flash devices connected in stacked mode-where >> each flash device is probed and configured independently-if both flash >> parts are required to operate in DDR mode, each device would need to >> perform tuning and store its tuning data separately. >> >> Given this, should we consider this use case and adapt the tuning >> architecture to support it? >> >> I'd appreciate your thoughts on this. > > Good point. > > The current implementation already stores the calibration state per > chip select (delay line settings, tuned flags, and operation templates), > so the data model supports independent tuning for each device. > > However, the runtime path that enables PHY mode does not restore the > per-CS delay line settings when switching between chip selects. As a > result, consecutive PHY accesses to different devices could end up using > the wrong delay line settings. > > This can be addressed with a small change by reading the currently > programmed DLL and reprogramming the PHY configuration registers > whenever they differ from the calibrated values for the selected chip. Are you going to include it to your series? Thanks, Michal