4.18-stable review patch. If anyone has any objections, please let me know.
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From: Linus Walleij linus.walleij@linaro.org
[ Upstream commit 46cb52ad414ac829680d0bb8cc7090ac2b577ca7 ]
The DMA is broken on this specific device for some unknown reason (probably badly designed or plain broken interface electronics) and will only work with PIO. Other users of the same hardware does not have this problem.
Add a specific quirk so that this Gemini device gets DMA turned off. Also fix up some code around passing the port information around in probe while we're at it.
Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/ata/pata_ftide010.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-)
--- a/drivers/ata/pata_ftide010.c +++ b/drivers/ata/pata_ftide010.c @@ -256,14 +256,12 @@ static struct ata_port_operations pata_f .qc_issue = ftide010_qc_issue, };
-static struct ata_port_info ftide010_port_info[] = { - { - .flags = ATA_FLAG_SLAVE_POSS, - .mwdma_mask = ATA_MWDMA2, - .udma_mask = ATA_UDMA6, - .pio_mask = ATA_PIO4, - .port_ops = &pata_ftide010_port_ops, - }, +static struct ata_port_info ftide010_port_info = { + .flags = ATA_FLAG_SLAVE_POSS, + .mwdma_mask = ATA_MWDMA2, + .udma_mask = ATA_UDMA6, + .pio_mask = ATA_PIO4, + .port_ops = &pata_ftide010_port_ops, };
#if IS_ENABLED(CONFIG_SATA_GEMINI) @@ -349,6 +347,7 @@ static int pata_ftide010_gemini_cable_de }
static int pata_ftide010_gemini_init(struct ftide010 *ftide, + struct ata_port_info *pi, bool is_ata1) { struct device *dev = ftide->dev; @@ -373,7 +372,13 @@ static int pata_ftide010_gemini_init(str
/* Flag port as SATA-capable */ if (gemini_sata_bridge_enabled(sg, is_ata1)) - ftide010_port_info[0].flags |= ATA_FLAG_SATA; + pi->flags |= ATA_FLAG_SATA; + + /* This device has broken DMA, only PIO works */ + if (of_machine_is_compatible("itian,sq201")) { + pi->mwdma_mask = 0; + pi->udma_mask = 0; + }
/* * We assume that a simple 40-wire cable is used in the PATA mode. @@ -435,6 +440,7 @@ static int pata_ftide010_gemini_init(str } #else static int pata_ftide010_gemini_init(struct ftide010 *ftide, + struct ata_port_info *pi, bool is_ata1) { return -ENOTSUPP; @@ -446,7 +452,7 @@ static int pata_ftide010_probe(struct pl { struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; - const struct ata_port_info pi = ftide010_port_info[0]; + struct ata_port_info pi = ftide010_port_info; const struct ata_port_info *ppi[] = { &pi, NULL }; struct ftide010 *ftide; struct resource *res; @@ -490,6 +496,7 @@ static int pata_ftide010_probe(struct pl * are ATA0. This will also set up the cable types. */ ret = pata_ftide010_gemini_init(ftide, + &pi, (res->start == 0x63400000)); if (ret) goto err_dis_clk;