120 lines
3.7 KiB
Diff
120 lines
3.7 KiB
Diff
From 5fcca3fd4b621d7b5bdeca18d36dfc6ca6cfe383 Mon Sep 17 00:00:00 2001
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From: Ionela Voinescu <ionela.voinescu@imgtec.com>
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Date: Wed, 10 Aug 2016 11:42:26 +0100
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Subject: spi: img-spfi: finish every transfer cleanly
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Before this change, the interrupt status bit that signaled
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the end of a tranfers was cleared in the wait_all_done
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function. That functionality triggered issues for DMA
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duplex transactions where the wait function was called
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twice, in both the TX and RX callbacks.
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In order to fix the issue, clear all interrupt data bits
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at the end of a PIO transfer or at the end of both TX and RX
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duplex transfers, if the transfer is not a pending tranfer
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(command waiting for data). After that, the status register
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is checked for new incoming data or new data requests to be
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signaled. If SPFI finished cleanly, no new interrupt data
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bits should be set.
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Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com>
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---
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drivers/spi/spi-img-spfi.c | 49 +++++++++++++++++++++++++++++++++-------------
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1 file changed, 35 insertions(+), 14 deletions(-)
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--- a/drivers/spi/spi-img-spfi.c
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+++ b/drivers/spi/spi-img-spfi.c
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@@ -83,6 +83,14 @@
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#define SPFI_INTERRUPT_SDE BIT(1)
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#define SPFI_INTERRUPT_SDTRIG BIT(0)
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+#define SPFI_INTERRUPT_DATA_BITS (SPFI_INTERRUPT_SDHF |\
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+ SPFI_INTERRUPT_SDFUL |\
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+ SPFI_INTERRUPT_GDEX32BIT |\
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+ SPFI_INTERRUPT_GDHF |\
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+ SPFI_INTERRUPT_GDFUL |\
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+ SPFI_INTERRUPT_ALLDONETRIG |\
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+ SPFI_INTERRUPT_GDEX8BIT)
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+
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/*
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* There are four parallel FIFOs of 16 bytes each. The word buffer
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* (*_32BIT_VALID_DATA) accesses all four FIFOs at once, resulting in an
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@@ -144,6 +152,23 @@ static inline void spfi_reset(struct img
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spfi_writel(spfi, 0, SPFI_CONTROL);
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}
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+static inline void spfi_finish(struct img_spfi *spfi)
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+{
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+ if (!(spfi->complete))
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+ return;
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+
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+ /* Clear data bits as all transfers(TX and RX) have finished */
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+ spfi_writel(spfi, SPFI_INTERRUPT_DATA_BITS, SPFI_INTERRUPT_CLEAR);
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+ if (spfi_readl(spfi, SPFI_INTERRUPT_STATUS) & SPFI_INTERRUPT_DATA_BITS) {
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+ dev_err(spfi->dev, "SPFI did not finish transfer cleanly.\n");
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+ spfi_reset(spfi);
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+ }
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+ /* Disable SPFI for it not to interfere with pending transactions */
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+ spfi_writel(spfi,
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+ spfi_readl(spfi, SPFI_CONTROL) & ~SPFI_CONTROL_SPFI_EN,
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+ SPFI_CONTROL);
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+}
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+
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static int spfi_wait_all_done(struct img_spfi *spfi)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(50);
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@@ -152,19 +177,9 @@ static int spfi_wait_all_done(struct img
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return 0;
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while (time_before(jiffies, timeout)) {
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- u32 status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS);
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-
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- if (status & SPFI_INTERRUPT_ALLDONETRIG) {
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- spfi_writel(spfi, SPFI_INTERRUPT_ALLDONETRIG,
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- SPFI_INTERRUPT_CLEAR);
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- /*
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- * Disable SPFI for it not to interfere with
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- * pending transactions
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- */
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- spfi_writel(spfi, spfi_readl(spfi, SPFI_CONTROL)
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- & ~SPFI_CONTROL_SPFI_EN, SPFI_CONTROL);
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+ if (spfi_readl(spfi, SPFI_INTERRUPT_STATUS) &
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+ SPFI_INTERRUPT_ALLDONETRIG)
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return 0;
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- }
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cpu_relax();
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}
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@@ -296,6 +311,8 @@ static int img_spfi_start_pio(struct spi
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}
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ret = spfi_wait_all_done(spfi);
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+ spfi_finish(spfi);
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+
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if (ret < 0)
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return ret;
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@@ -311,8 +328,10 @@ static void img_spfi_dma_rx_cb(void *dat
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spin_lock_irqsave(&spfi->lock, flags);
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spfi->rx_dma_busy = false;
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- if (!spfi->tx_dma_busy)
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+ if (!spfi->tx_dma_busy) {
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+ spfi_finish(spfi);
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spi_finalize_current_transfer(spfi->master);
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+ }
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spin_unlock_irqrestore(&spfi->lock, flags);
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}
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@@ -325,8 +344,10 @@ static void img_spfi_dma_tx_cb(void *dat
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spin_lock_irqsave(&spfi->lock, flags);
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spfi->tx_dma_busy = false;
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- if (!spfi->rx_dma_busy)
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+ if (!spfi->rx_dma_busy) {
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+ spfi_finish(spfi);
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spi_finalize_current_transfer(spfi->master);
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+ }
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spin_unlock_irqrestore(&spfi->lock, flags);
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}
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