The patch spi: tegra114: reset controller on probe has been applied to the spi tree at https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark >From 019194933339b3e9b486639c8cb3692020844d65 Mon Sep 17 00:00:00 2001 From: Sowjanya Komatineni <skomatineni@xxxxxxxxxx> Date: Tue, 26 Mar 2019 22:56:32 -0700 Subject: [PATCH] spi: tegra114: reset controller on probe Fixes: SPI driver can be built as module so perform SPI controller reset on probe to make sure it is in valid state before initiating transfer. Signed-off-by: Sowjanya Komatineni <skomatineni@xxxxxxxxxx> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> --- drivers/spi/spi-tegra114.c | 32 ++++++++++++++++++-------------- 1 file changed, 18 insertions(+), 14 deletions(-) diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c index 05bb2f9bff3c..09cfae3abce2 100644 --- a/drivers/spi/spi-tegra114.c +++ b/drivers/spi/spi-tegra114.c @@ -1136,27 +1136,19 @@ static int tegra_spi_probe(struct platform_device *pdev) spi_irq = platform_get_irq(pdev, 0); tspi->irq = spi_irq; - ret = request_threaded_irq(tspi->irq, tegra_spi_isr, - tegra_spi_isr_thread, IRQF_ONESHOT, - dev_name(&pdev->dev), tspi); - if (ret < 0) { - dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n", - tspi->irq); - goto exit_free_master; - } tspi->clk = devm_clk_get(&pdev->dev, "spi"); if (IS_ERR(tspi->clk)) { dev_err(&pdev->dev, "can not get clock\n"); ret = PTR_ERR(tspi->clk); - goto exit_free_irq; + goto exit_free_master; } tspi->rst = devm_reset_control_get_exclusive(&pdev->dev, "spi"); if (IS_ERR(tspi->rst)) { dev_err(&pdev->dev, "can not get reset\n"); ret = PTR_ERR(tspi->rst); - goto exit_free_irq; + goto exit_free_master; } tspi->max_buf_size = SPI_FIFO_DEPTH << 2; @@ -1164,7 +1156,7 @@ static int tegra_spi_probe(struct platform_device *pdev) ret = tegra_spi_init_dma_param(tspi, true); if (ret < 0) - goto exit_free_irq; + goto exit_free_master; ret = tegra_spi_init_dma_param(tspi, false); if (ret < 0) goto exit_rx_dma_free; @@ -1186,18 +1178,32 @@ static int tegra_spi_probe(struct platform_device *pdev) dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret); goto exit_pm_disable; } + + reset_control_assert(tspi->rst); + udelay(2); + reset_control_deassert(tspi->rst); tspi->def_command1_reg = SPI_M_S; tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); pm_runtime_put(&pdev->dev); + ret = request_threaded_irq(tspi->irq, tegra_spi_isr, + tegra_spi_isr_thread, IRQF_ONESHOT, + dev_name(&pdev->dev), tspi); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n", + tspi->irq); + goto exit_pm_disable; + } master->dev.of_node = pdev->dev.of_node; ret = devm_spi_register_master(&pdev->dev, master); if (ret < 0) { dev_err(&pdev->dev, "can not register to master err %d\n", ret); - goto exit_pm_disable; + goto exit_free_irq; } return ret; +exit_free_irq: + free_irq(spi_irq, tspi); exit_pm_disable: pm_runtime_disable(&pdev->dev); if (!pm_runtime_status_suspended(&pdev->dev)) @@ -1205,8 +1211,6 @@ static int tegra_spi_probe(struct platform_device *pdev) tegra_spi_deinit_dma_param(tspi, false); exit_rx_dma_free: tegra_spi_deinit_dma_param(tspi, true); -exit_free_irq: - free_irq(spi_irq, tspi); exit_free_master: spi_master_put(master); return ret; -- 2.20.1
