On Sun, Feb 03, 2019 at 11:56:27PM +0800, Chen-Yu Tsai wrote: > The MMC device tree bindings include properties used to signal various > signalling speed modes. Until now the sunxi driver was accepting them > without any further filtering, while the sunxi device trees were not > actually using them. > > Since some of the H5 boards can not run at higher speed modes stably, > we are resorting to declaring the higher speed modes per-board. > > Regardless, having boards declare modes and blindly following them, > even without proper support in the driver, is generally a bad thing. > > Filter out all unsupported modes from the capabilities mask after > the device tree properties have been parsed. > > Cc: <[email protected]> > Signed-off-by: Chen-Yu Tsai <[email protected]> > > --- > > This should be backported to stable kernels in case people try to run > new device trees (that declare newly supported modes) with old kernels. > --- > drivers/mmc/host/sunxi-mmc.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > index 7415af8c8ff6..a01433012db0 100644 > --- a/drivers/mmc/host/sunxi-mmc.c > +++ b/drivers/mmc/host/sunxi-mmc.c > @@ -1415,6 +1415,22 @@ static int sunxi_mmc_probe(struct platform_device > *pdev) > if (ret) > goto error_free_dma; > > + /* > + * If we don't support delay chains in the SoC, we can't use any > + * of the DDR speed modes. Mask them out in case the device > + * tree specifies the properties for them, which gets added to > + * the caps by mmc_of_parse() above. > + */ > + if (!(host->cfg->clk_delays || host->use_new_timings)) > + mmc->caps &= ~(MMC_CAP_3_3V_DDR | MMC_CAP_1_8V_DDR | > + MMC_CAP_1_2V_DDR); > + > + /* TODO: UHS modes untested due to lack of supporting boards */ > + mmc->caps &= ~MMC_CAP_UHS;
I've tested up to SDR104 and it works on the A64 at least > + /* TODO: This driver doesn't support HS200 and HS400 modes yet */ > + mmc->caps2 &= ~(MMC_CAP2_HS200 | MMC_CAP2_HS400); And HS200 works too. Maxime -- Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
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