diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.1/0163-bcm2708-dmaengine-Use-more-DMA-channels-but-not-12.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.1/0163-bcm2708-dmaengine-Use-more-DMA-channels-but-not-12.patch | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0163-bcm2708-dmaengine-Use-more-DMA-channels-but-not-12.patch b/target/linux/brcm2708/patches-4.1/0163-bcm2708-dmaengine-Use-more-DMA-channels-but-not-12.patch deleted file mode 100644 index 6e01d8fe91..0000000000 --- a/target/linux/brcm2708/patches-4.1/0163-bcm2708-dmaengine-Use-more-DMA-channels-but-not-12.patch +++ /dev/null @@ -1,173 +0,0 @@ -From 08746a98cb4867e704bb799506301ca7200d78fa Mon Sep 17 00:00:00 2001 -From: Phil Elwell <phil@raspberrypi.org> -Date: Thu, 20 Aug 2015 13:50:18 +0100 -Subject: [PATCH 163/222] bcm2708-dmaengine: Use more DMA channels (but not 12) - -1) Only the bcm2708_fb drivers uses the legacy DMA API, and -it requires a BULK-capable channel, so all other types -(FAST, NORMAL and LITE) can be made available to the regular -DMA API. - -2) DMA channels 11-14 share an interrupt. The driver can't -handle this, so don't use channels 12-14 (12 was used, probably -because it appears to have an interrupt, but in reality that -interrupt is for activity on ANY channel). This may explain -a lockup encountered when running out of DMA channels. - -The combined effect of this patch is to leave 7 DMA channels -available + channel 0 for bcm2708_fb via the legacy API. - -See: https://github.com/raspberrypi/linux/issues/1110 - https://github.com/raspberrypi/linux/issues/1108 ---- - arch/arm/boot/dts/bcm2708_common.dtsi | 5 ++-- - drivers/dma/bcm2708-dmaengine.c | 43 +++++++++++++++++++++++------------ - 2 files changed, 31 insertions(+), 17 deletions(-) - ---- a/arch/arm/boot/dts/bcm2708_common.dtsi -+++ b/arch/arm/boot/dts/bcm2708_common.dtsi -@@ -59,11 +59,10 @@ - <1 24>, - <1 25>, - <1 26>, -- <1 27>, -- <1 28>; -+ <1 27>; - - #dma-cells = <1>; -- brcm,dma-channel-mask = <0x7f35>; -+ brcm,dma-channel-mask = <0x0f35>; - }; - - intc: interrupt-controller { ---- a/drivers/dma/bcm2708-dmaengine.c -+++ b/drivers/dma/bcm2708-dmaengine.c -@@ -184,7 +184,7 @@ static void vc_dmaman_init(struct vc_dma - } - - static int vc_dmaman_chan_alloc(struct vc_dmaman *dmaman, -- unsigned preferred_feature_set) -+ unsigned required_feature_set) - { - u32 chans; - int chan = 0; -@@ -193,10 +193,8 @@ static int vc_dmaman_chan_alloc(struct v - chans = dmaman->chan_available; - for (feature = 0; feature < BCM_DMA_FEATURE_COUNT; feature++) - /* select the subset of available channels with the desired -- feature so long as some of the candidate channels have that -- feature */ -- if ((preferred_feature_set & (1 << feature)) && -- (chans & dmaman->has_feature[feature])) -+ features */ -+ if (required_feature_set & (1 << feature)) - chans &= dmaman->has_feature[feature]; - - if (!chans) -@@ -228,7 +226,7 @@ static int vc_dmaman_chan_free(struct vc - - /* DMA Manager Monitor */ - --extern int bcm_dma_chan_alloc(unsigned preferred_feature_set, -+extern int bcm_dma_chan_alloc(unsigned required_feature_set, - void __iomem **out_dma_base, int *out_dma_irq) - { - struct vc_dmaman *dmaman = g_dmaman; -@@ -240,7 +238,7 @@ extern int bcm_dma_chan_alloc(unsigned p - return -ENODEV; - - mutex_lock(&dmaman->lock); -- chan = vc_dmaman_chan_alloc(dmaman, preferred_feature_set); -+ chan = vc_dmaman_chan_alloc(dmaman, required_feature_set); - if (chan < 0) - goto out; - -@@ -442,6 +440,7 @@ static inline struct bcm2835_desc *to_bc - return container_of(t, struct bcm2835_desc, vd.tx); - } - -+#if 0 - static void dma_dumpregs(struct bcm2835_chan *c) - { - pr_debug("-------------DMA DUMPREGS-------------\n"); -@@ -457,6 +456,7 @@ static void dma_dumpregs(struct bcm2835_ - readl(c->chan_base + BCM2835_DMA_NEXTCB)); - pr_debug("--------------------------------------\n"); - } -+#endif - - static void bcm2835_dma_desc_free(struct virt_dma_desc *vd) - { -@@ -862,6 +862,7 @@ static struct dma_async_tx_descriptor *b - uint32_t len = sg_dma_len(sgent); - - for (j = 0; j < len; j += max_size) { -+ u32 waits; - struct bcm2835_dma_cb *control_block = - &d->control_block_base[i+splitct]; - -@@ -879,7 +880,7 @@ static struct dma_async_tx_descriptor *b - } - - /* Common part */ -- u32 waits = SDHCI_BCM_DMA_WAITS; -+ waits = SDHCI_BCM_DMA_WAITS; - if ((dma_debug >> 0) & 0x1f) - waits = (dma_debug >> 0) & 0x1f; - control_block->info |= BCM2835_DMA_WAITS(waits); -@@ -1074,6 +1075,14 @@ static int bcm2835_dma_probe(struct plat - int rc; - int i; - int irq; -+#ifdef CONFIG_DMA_BCM2708_LEGACY -+ static const u32 wanted_features[] = { -+ BCM_DMA_FEATURE_FAST, -+ BCM_DMA_FEATURE_NORMAL, -+ BCM_DMA_FEATURE_LITE -+ }; -+ int j; -+#endif - - - if (!pdev->dev.dma_mask) -@@ -1120,20 +1129,24 @@ static int bcm2835_dma_probe(struct plat - - platform_set_drvdata(pdev, od); - -- for (i = 0; i < 5; i++) { -+ for (i = 0, j = 0; j < ARRAY_SIZE(wanted_features);) { -+ - void __iomem *chan_base; - int chan_id; - -- chan_id = bcm_dma_chan_alloc(BCM_DMA_FEATURE_LITE, -- &chan_base, -- &irq); -- -- if (chan_id < 0) -- break; -+ chan_id = bcm_dma_chan_alloc(wanted_features[j], -+ &chan_base, -+ &irq); -+ -+ if (chan_id < 0) { -+ j++; -+ continue; -+ } - - rc = bcm2708_dma_chan_init(od, chan_base, chan_id, irq); - if (rc) - goto err_no_dma; -+ i++; - } - - if (pdev->dev.of_node) { -@@ -1146,6 +1159,8 @@ static int bcm2835_dma_probe(struct plat - } - } - -+ dev_info(&pdev->dev, "Initialized %i DMA channels (+ 1 legacy)\n", i); -+ - #else - rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); - if (rc) |