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63 lines
2.3 KiB
Diff
63 lines
2.3 KiB
Diff
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From 4d2261fe86ce08bbee3c000718000e9f86593d88 Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.com>
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Date: Wed, 8 Nov 2023 11:52:16 +0000
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Subject: [PATCH] drivers: mmc: sdhci: add SPURIOUS_INT_RESP quirk
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Certain controllers (dwc-mshc) generate timeout conditions separately to
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command-completion conditions, where the end result is interrupts are
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separated in time depending on the current SDCLK frequency.
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This causes spurious interrupts if SDCLK is slow compared to the CPU's
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ability to process and return from interrupt. This occurs during card
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probe with an empty slot where all commands that would generate a
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response time out.
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Add a quirk to squelch command response interrupts when a command
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timeout interrupt is received.
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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---
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drivers/mmc/host/sdhci.c | 11 +++++++++++
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drivers/mmc/host/sdhci.h | 3 +++
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2 files changed, 14 insertions(+)
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--- a/drivers/mmc/host/sdhci.c
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+++ b/drivers/mmc/host/sdhci.c
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@@ -1728,6 +1728,12 @@ static bool sdhci_send_command(struct sd
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if (host->use_external_dma)
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sdhci_external_dma_pre_transfer(host, cmd);
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+ if (host->quirks2 & SDHCI_QUIRK2_SPURIOUS_INT_RESP) {
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+ host->ier |= SDHCI_INT_RESPONSE;
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+ sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
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+ sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
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+ }
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+
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sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
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return true;
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@@ -3330,6 +3336,11 @@ static void sdhci_cmd_irq(struct sdhci_h
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if (intmask & SDHCI_INT_TIMEOUT) {
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host->cmd->error = -ETIMEDOUT;
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sdhci_err_stats_inc(host, CMD_TIMEOUT);
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+ if (host->quirks2 & SDHCI_QUIRK2_SPURIOUS_INT_RESP) {
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+ host->ier &= ~SDHCI_INT_RESPONSE;
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+ sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
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+ sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
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+ }
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} else {
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host->cmd->error = -EILSEQ;
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if (!mmc_op_tuning(host->cmd->opcode))
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--- a/drivers/mmc/host/sdhci.h
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+++ b/drivers/mmc/host/sdhci.h
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@@ -486,6 +486,9 @@ struct sdhci_host {
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#define SDHCI_QUIRK2_NO_SDR50 (1<<20)
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#define SDHCI_QUIRK2_NO_SDR104 (1<<21)
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+/* Command timeouts may generate a trailing INT_RESPONSE later */
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+#define SDHCI_QUIRK2_SPURIOUS_INT_RESP (1<<31)
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+
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int irq; /* Device IRQ */
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void __iomem *ioaddr; /* Mapped address */
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phys_addr_t mapbase; /* physical address base */
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