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apm821xx: attempt to fix sata access freezes

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The original vendor's driver programmed the dma controller's
AHB HPROT values to enable bufferable, privileged mode. This
along with the "same priorty for both channels" could very
well fix the freezes that have been reported on the forum by
@ticerex and @takimata.

<https://forum.lede-project.org/t/wd-mybook-live-duo-two-disks/16195/46>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
This commit is contained in:
Christian Lamparter 2018-07-14 17:21:56 +02:00 committed by John Crispin
parent c729c43b39
commit c3f9a1ac0e
1 changed files with 25 additions and 0 deletions
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25
target/linux/apm821xx/patches-4.14/302-dw-dma-hprot-fix-and-equal-priortiy.patch Normal file
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@ -0,0 +1,25 @@
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -167,6 +167,8 @@ static void dwc_initialize_chan_dw(struc
cfghi |= DWC_CFGH_DST_PER(dwc->dws.dst_id);
cfghi |= DWC_CFGH_SRC_PER(dwc->dws.src_id);
+ cfghi |= DWC_CFGH_PROTCTL(3); /* bufferable + privileged access */
+
/* Set polarity of handshake interface */
cfglo |= hs_polarity ? DWC_CFGL_HS_DST_POL | DWC_CFGL_HS_SRC_POL : 0;
@@ -1293,11 +1295,8 @@ int dw_dma_probe(struct dw_dma_chip *chi
else
list_add(&dwc->chan.device_node, &dw->dma.channels);
- /* 7 is highest priority & 0 is lowest. */
- if (pdata->chan_priority == CHAN_PRIORITY_ASCENDING)
- dwc->priority = pdata->nr_channels - i - 1;
- else
- dwc->priority = i;
+ /* set all channels to the same priority */
+ dwc->priority = pdata->nr_channels - 1;
dwc->ch_regs = &__dw_regs(dw)->CHAN[i];
spin_lock_init(&dwc->lock);