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d81c03f05e
These patches were generated from: https://github.com/raspberrypi/linux/commits/rpi-6.12.y With the following command: git format-patch -N v6.12.27..HEAD (HEAD -> 8d3206ee456a5ecdf9ddbfd8e5e231e4f0cd716e) Exceptions: - (def)configs patches - github workflows patches - applied & reverted patches - readme patches - wireless patches Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
67 lines
2.0 KiB
Diff
67 lines
2.0 KiB
Diff
From e0fcd746ae7bc239bec6536078c8b4a93dab328d Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Mon, 1 Jul 2024 15:49:14 +0100
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Subject: [PATCH] spi: dw: Save bandwidth with the TMOD_TO feature
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TMOD_TO is the transmit-only mode that doesn't put data into the receive
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FIFO. Using TMOD_TO when the user doesn't want the received data saves
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CPU time and memory bandwidth.
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/spi/spi-dw-core.c | 27 +++++++++++++++++----------
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1 file changed, 17 insertions(+), 10 deletions(-)
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--- a/drivers/spi/spi-dw-core.c
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+++ b/drivers/spi/spi-dw-core.c
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@@ -227,12 +227,17 @@ static irqreturn_t dw_spi_transfer_handl
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* final stage of the transfer. By doing so we'll get the next IRQ
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* right when the leftover incoming data is received.
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*/
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- dw_reader(dws);
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- if (!dws->rx_len) {
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- dw_spi_mask_intr(dws, 0xff);
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+ if (dws->rx_len) {
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+ dw_reader(dws);
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+ if (!dws->rx_len) {
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+ dw_spi_mask_intr(dws, 0xff);
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+ spi_finalize_current_transfer(dws->host);
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+ } else if (dws->rx_len <= dw_readl(dws, DW_SPI_RXFTLR)) {
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+ dw_writel(dws, DW_SPI_RXFTLR, dws->rx_len - 1);
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+ }
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+ } else if (!dws->tx_len) {
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+ dw_spi_mask_intr(dws, DW_SPI_INT_TXEI);
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spi_finalize_current_transfer(dws->host);
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- } else if (dws->rx_len <= dw_readl(dws, DW_SPI_RXFTLR)) {
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- dw_writel(dws, DW_SPI_RXFTLR, dws->rx_len - 1);
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}
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/*
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@@ -241,12 +246,9 @@ static irqreturn_t dw_spi_transfer_handl
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* have the TXE IRQ flood at the final stage of the transfer.
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*/
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if (irq_status & DW_SPI_INT_TXEI) {
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- dw_writer(dws);
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- if (!dws->tx_len) {
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+ if (!dws->tx_len)
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dw_spi_mask_intr(dws, DW_SPI_INT_TXEI);
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- if (!dws->rx_len)
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- spi_finalize_current_transfer(dws->host);
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- }
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+ dw_writer(dws);
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}
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return IRQ_HANDLED;
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@@ -436,6 +438,11 @@ static int dw_spi_transfer_one(struct sp
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dws->rx = transfer->rx_buf;
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dws->rx_len = dws->tx_len;
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+ if (!dws->rx) {
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+ dws->rx_len = 0;
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+ cfg.tmode = DW_SPI_CTRLR0_TMOD_TO;
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+ }
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+
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/* Ensure the data above is visible for all CPUs */
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smp_mb();
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