bcm53xx: revert SPI controller commit breaking flash reads
That upstream commit caused instability in flash reads. It was reported but there isn't any proper fix as for now. Signed-off-by: Rafał Miłecki <rafal@milecki.pl>v19.07.3_mercusys_ac12_duma
Rafał Miłecki
6 years ago
parent
b078229412
commit
0417b08b06
@ -0,0 +1,146 @@
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Subject: [PATCH] Revert "spi: bcm-qspi: Fix bcm_qspi_bspi_read() performance"
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This reverts commit 345309fa7c0c9206a5344d379b174499952d79d9.
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BSPI reads became unstable starting with above commit. There are BSPI
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timeouts like this:
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[ 15.637809] bcm_iproc 18029200.spi: timeout waiting for BSPI
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(...)
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[ 15.997809] bcm_iproc 18029200.spi: timeout waiting for BSPI
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which cause filesystem stability problems.
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Before above commit every time that bcm_qspi_bspi_lr_l2_isr() called
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bcm_qspi_bspi_lr_l2_isr() it was resulting in bspi_rf_msg_len becoming
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0.
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With that change it's not the case anymore which suggests there may be
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some bug around that code.
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It has changed and the new behavior seems to be causing problems.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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---
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--- a/drivers/spi/spi-bcm-qspi.c
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+++ b/drivers/spi/spi-bcm-qspi.c
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@@ -88,7 +88,7 @@
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#define BSPI_BPP_MODE_SELECT_MASK BIT(8)
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#define BSPI_BPP_ADDR_SELECT_MASK BIT(16)
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-#define BSPI_READ_LENGTH 512
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+#define BSPI_READ_LENGTH 256
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/* MSPI register offsets */
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#define MSPI_SPCR0_LSB 0x000
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@@ -806,7 +806,7 @@ static int bcm_qspi_bspi_flash_read(stru
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struct spi_flash_read_message *msg)
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{
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struct bcm_qspi *qspi = spi_master_get_devdata(spi->master);
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- u32 addr = 0, len, rdlen, len_words;
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+ u32 addr = 0, len, len_words;
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int ret = 0;
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unsigned long timeo = msecs_to_jiffies(100);
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struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc;
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@@ -819,7 +819,7 @@ static int bcm_qspi_bspi_flash_read(stru
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bcm_qspi_write(qspi, MSPI, MSPI_WRITE_LOCK, 0);
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/*
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- * when using flex mode we need to send
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+ * when using flex mode mode we need to send
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* the upper address byte to bspi
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*/
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if (bcm_qspi_bspi_ver_three(qspi) == false) {
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@@ -833,56 +833,47 @@ static int bcm_qspi_bspi_flash_read(stru
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else
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addr = msg->from & 0x00ffffff;
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+ /* set BSPI RAF buffer max read length */
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+ len = msg->len;
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+ if (len > BSPI_READ_LENGTH)
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+ len = BSPI_READ_LENGTH;
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+
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if (bcm_qspi_bspi_ver_three(qspi) == true)
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addr = (addr + 0xc00000) & 0xffffff;
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- /*
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- * read into the entire buffer by breaking the reads
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- * into RAF buffer read lengths
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- */
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- len = msg->len;
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+ reinit_completion(&qspi->bspi_done);
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+ bcm_qspi_enable_bspi(qspi);
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+ len_words = (len + 3) >> 2;
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+ qspi->bspi_rf_msg = msg;
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+ qspi->bspi_rf_msg_status = 0;
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qspi->bspi_rf_msg_idx = 0;
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+ qspi->bspi_rf_msg_len = len;
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+ dev_dbg(&qspi->pdev->dev, "bspi xfr addr 0x%x len 0x%x", addr, len);
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- do {
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- if (len > BSPI_READ_LENGTH)
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- rdlen = BSPI_READ_LENGTH;
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- else
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- rdlen = len;
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-
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- reinit_completion(&qspi->bspi_done);
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- bcm_qspi_enable_bspi(qspi);
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- len_words = (rdlen + 3) >> 2;
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- qspi->bspi_rf_msg = msg;
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- qspi->bspi_rf_msg_status = 0;
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- qspi->bspi_rf_msg_len = rdlen;
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- dev_dbg(&qspi->pdev->dev,
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- "bspi xfr addr 0x%x len 0x%x", addr, rdlen);
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- bcm_qspi_write(qspi, BSPI, BSPI_RAF_START_ADDR, addr);
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- bcm_qspi_write(qspi, BSPI, BSPI_RAF_NUM_WORDS, len_words);
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- bcm_qspi_write(qspi, BSPI, BSPI_RAF_WATERMARK, 0);
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- if (qspi->soc_intc) {
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- /*
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- * clear soc MSPI and BSPI interrupts and enable
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- * BSPI interrupts.
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- */
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- soc_intc->bcm_qspi_int_ack(soc_intc, MSPI_BSPI_DONE);
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- soc_intc->bcm_qspi_int_set(soc_intc, BSPI_DONE, true);
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- }
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+ bcm_qspi_write(qspi, BSPI, BSPI_RAF_START_ADDR, addr);
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+ bcm_qspi_write(qspi, BSPI, BSPI_RAF_NUM_WORDS, len_words);
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+ bcm_qspi_write(qspi, BSPI, BSPI_RAF_WATERMARK, 0);
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+
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+ if (qspi->soc_intc) {
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+ /*
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+ * clear soc MSPI and BSPI interrupts and enable
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+ * BSPI interrupts.
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+ */
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+ soc_intc->bcm_qspi_int_ack(soc_intc, MSPI_BSPI_DONE);
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+ soc_intc->bcm_qspi_int_set(soc_intc, BSPI_DONE, true);
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+ }
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- /* Must flush previous writes before starting BSPI operation */
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- mb();
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- bcm_qspi_bspi_lr_start(qspi);
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- if (!wait_for_completion_timeout(&qspi->bspi_done, timeo)) {
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- dev_err(&qspi->pdev->dev, "timeout waiting for BSPI\n");
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- ret = -ETIMEDOUT;
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- break;
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- }
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+ /* Must flush previous writes before starting BSPI operation */
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+ mb();
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- /* set msg return length */
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- msg->retlen += rdlen;
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- addr += rdlen;
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- len -= rdlen;
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- } while (len);
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+ bcm_qspi_bspi_lr_start(qspi);
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+ if (!wait_for_completion_timeout(&qspi->bspi_done, timeo)) {
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+ dev_err(&qspi->pdev->dev, "timeout waiting for BSPI\n");
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+ ret = -ETIMEDOUT;
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+ } else {
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+ /* set the return length for the caller */
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+ msg->retlen = len;
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+ }
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return ret;
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}
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