Merge tag 'mmc-v6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc

Pull MMC fixes from Ulf Hansson:
 "MMC core:
   - Prevent splat from warning when setting maximum DMA segment

  MMC host:
   - mvsdio: Drop sg_miter support for PIO as it didn't work
   - sdhci-of-dwcmshc: Prevent stale interrupt for the T-Head 1520
     variant"

* tag 'mmc-v6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
  mmc: sdhci-of-dwcmshc: Prevent stale command interrupt handling
  Revert "mmc: mvsdio: Use sg_miter for PIO"
  mmc: core: Only set maximum DMA segment size if DMA is supported

3 files changed, 28 insertions, 54 deletions

diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
index d0b3ca8a11f0..4d6844261912 100644
--- a/drivers/mmc/core/queue.c
+++ b/drivers/mmc/core/queue.c
@@ -388,7 +388,8 @@ static struct gendisk *mmc_alloc_disk(struct mmc_queue *mq,
 
 	blk_queue_rq_timeout(mq->queue, 60 * HZ);
 
-	dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));
+	if (mmc_dev(host)->dma_parms)
+		dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));
 
 	INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler);
 	INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);
diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c
index d859b1a3ab71..12df4ff9eeee 100644
--- a/drivers/mmc/host/mvsdio.c
+++ b/drivers/mmc/host/mvsdio.c
@@ -38,9 +38,8 @@ struct mvsd_host {
 	unsigned int xfer_mode;
 	unsigned int intr_en;
 	unsigned int ctrl;
-	bool use_pio;
-	struct sg_mapping_iter sg_miter;
 	unsigned int pio_size;
+	void *pio_ptr;
 	unsigned int sg_frags;
 	unsigned int ns_per_clk;
 	unsigned int clock;
@@ -115,18 +114,11 @@ static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
 		 * data when the buffer is not aligned on a 64 byte
 		 * boundary.
 		 */
-		unsigned int miter_flags = SG_MITER_ATOMIC; /* Used from IRQ */
-
-		if (data->flags & MMC_DATA_READ)
-			miter_flags |= SG_MITER_TO_SG;
-		else
-			miter_flags |= SG_MITER_FROM_SG;
-
 		host->pio_size = data->blocks * data->blksz;
-		sg_miter_start(&host->sg_miter, data->sg, data->sg_len, miter_flags);
+		host->pio_ptr = sg_virt(data->sg);
 		if (!nodma)
-			dev_dbg(host->dev, "fallback to PIO for data\n");
-		host->use_pio = true;
+			dev_dbg(host->dev, "fallback to PIO for data at 0x%p size %d\n",
+				host->pio_ptr, host->pio_size);
 		return 1;
 	} else {
 		dma_addr_t phys_addr;
@@ -137,7 +129,6 @@ static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
 		phys_addr = sg_dma_address(data->sg);
 		mvsd_write(MVSD_SYS_ADDR_LOW, (u32)phys_addr & 0xffff);
 		mvsd_write(MVSD_SYS_ADDR_HI,  (u32)phys_addr >> 16);
-		host->use_pio = false;
 		return 0;
 	}
 }
@@ -297,8 +288,8 @@ static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data,
 {
 	void __iomem *iobase = host->base;
 
-	if (host->use_pio) {
-		sg_miter_stop(&host->sg_miter);
+	if (host->pio_ptr) {
+		host->pio_ptr = NULL;
 		host->pio_size = 0;
 	} else {
 		dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags,
@@ -353,12 +344,9 @@ static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data,
 static irqreturn_t mvsd_irq(int irq, void *dev)
 {
 	struct mvsd_host *host = dev;
-	struct sg_mapping_iter *sgm = &host->sg_miter;
 	void __iomem *iobase = host->base;
 	u32 intr_status, intr_done_mask;
 	int irq_handled = 0;
-	u16 *p;
-	int s;
 
 	intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 	dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n",
@@ -382,36 +370,15 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
 	spin_lock(&host->lock);
 
 	/* PIO handling, if needed. Messy business... */
-	if (host->use_pio) {
-		/*
-		 * As we set sgm->consumed this always gives a valid buffer
-		 * position.
-		 */
-		if (!sg_miter_next(sgm)) {
-			/* This should not happen */
-			dev_err(host->dev, "ran out of scatter segments\n");
-			spin_unlock(&host->lock);
-			host->intr_en &=
-				~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W |
-				  MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
-			mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
-			return IRQ_HANDLED;
-		}
-		p = sgm->addr;
-		s = sgm->length;
-		if (s > host->pio_size)
-			s = host->pio_size;
-	}
-
-	if (host->use_pio &&
+	if (host->pio_size &&
 	    (intr_status & host->intr_en &
 	     (MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) {
-
+		u16 *p = host->pio_ptr;
+		int s = host->pio_size;
 		while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) {
 			readsw(iobase + MVSD_FIFO, p, 16);
 			p += 16;
 			s -= 32;
-			sgm->consumed += 32;
 			intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 		}
 		/*
@@ -424,7 +391,6 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
 				put_unaligned(mvsd_read(MVSD_FIFO), p++);
 				put_unaligned(mvsd_read(MVSD_FIFO), p++);
 				s -= 4;
-				sgm->consumed += 4;
 				intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 			}
 			if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) {
@@ -432,13 +398,10 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
 				val[0] = mvsd_read(MVSD_FIFO);
 				val[1] = mvsd_read(MVSD_FIFO);
 				memcpy(p, ((void *)&val) + 4 - s, s);
-				sgm->consumed += s;
 				s = 0;
 				intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 			}
-			/* PIO transfer done */
-			host->pio_size -= sgm->consumed;
-			if (host->pio_size == 0) {
+			if (s == 0) {
 				host->intr_en &=
 				     ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W);
 				mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
@@ -450,10 +413,14 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
 		}
 		dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
 			s, intr_status, mvsd_read(MVSD_HW_STATE));
+		host->pio_ptr = p;
+		host->pio_size = s;
 		irq_handled = 1;
-	} else if (host->use_pio &&
+	} else if (host->pio_size &&
 		   (intr_status & host->intr_en &
 		    (MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) {
+		u16 *p = host->pio_ptr;
+		int s = host->pio_size;
 		/*
 		 * The TX_FIFO_8W bit is unreliable. When set, bursting
 		 * 16 halfwords all at once in the FIFO drops data. Actually
@@ -464,7 +431,6 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
 			mvsd_write(MVSD_FIFO, get_unaligned(p++));
 			mvsd_write(MVSD_FIFO, get_unaligned(p++));
 			s -= 4;
-			sgm->consumed += 4;
 			intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 		}
 		if (s < 4) {
@@ -473,13 +439,10 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
 				memcpy(((void *)&val) + 4 - s, p, s);
 				mvsd_write(MVSD_FIFO, val[0]);
 				mvsd_write(MVSD_FIFO, val[1]);
-				sgm->consumed += s;
 				s = 0;
 				intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 			}
-			/* PIO transfer done */
-			host->pio_size -= sgm->consumed;
-			if (host->pio_size == 0) {
+			if (s == 0) {
 				host->intr_en &=
 				     ~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
 				mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
@@ -487,6 +450,8 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
 		}
 		dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
 			s, intr_status, mvsd_read(MVSD_HW_STATE));
+		host->pio_ptr = p;
+		host->pio_size = s;
 		irq_handled = 1;
 	}
 
diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
index 8999b97263af..8fd80dac11bf 100644
--- a/drivers/mmc/host/sdhci-of-dwcmshc.c
+++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
@@ -852,6 +852,14 @@ static void th1520_sdhci_reset(struct sdhci_host *host, u8 mask)
 
 	sdhci_reset(host, mask);
 
+	/* The T-Head 1520 SoC does not comply with the SDHCI specification
+	 * regarding the "Software Reset for CMD line should clear 'Command
+	 * Complete' in the Normal Interrupt Status Register." Clear the bit
+	 * here to compensate for this quirk.
+	 */
+	if (mask & SDHCI_RESET_CMD)
+		sdhci_writel(host, SDHCI_INT_RESPONSE, SDHCI_INT_STATUS);
+
 	if (priv->flags & FLAG_IO_FIXED_1V8) {
 		ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 		if (!(ctrl_2 & SDHCI_CTRL_VDD_180)) {