From: Christian Lamparter Date: Sat, 14 Jul 2018 15:21:56 +0000 (+0200) Subject: apm821xx: attempt to fix sata access freezes X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=c3f9a1ac0e7ae536552e2745582dc47098cefc07;p=openwrt%2Fstaging%2Faparcar.git apm821xx: attempt to fix sata access freezes 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. Signed-off-by: Christian Lamparter --- diff --git a/target/linux/apm821xx/patches-4.14/302-dw-dma-hprot-fix-and-equal-priortiy.patch b/target/linux/apm821xx/patches-4.14/302-dw-dma-hprot-fix-and-equal-priortiy.patch new file mode 100644 index 0000000000..c6e4331aa9 --- /dev/null +++ b/target/linux/apm821xx/patches-4.14/302-dw-dma-hprot-fix-and-equal-priortiy.patch @@ -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);