| Message ID | 82cf7861-5cf8-302d-5354-435282d95619@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Heiner Kallweit <hkallweit1@gmail.com> writes: > So far max_blk_count isn't set what results in a default of value 8 > to be used (PAGE_SIZE / block size). > > Set max_blk_count to 256 as used in the uboot driver. > > Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Thanks for the patch. A minor comment below: > --- > drivers/mmc/host/meson-gx-mmc.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c > index 3308b5b6..030425be 100644 > --- a/drivers/mmc/host/meson-gx-mmc.c > +++ b/drivers/mmc/host/meson-gx-mmc.c > @@ -799,6 +799,7 @@ static int meson_mmc_probe(struct platform_device *pdev) > goto free_host; > } > > + mmc->max_blk_count = 256; A step in the right direction, but the # blocks is actually a 9-bit field (c.f. length field of cmd_cfg part of descriptor (bits 8:0). So this should be more like: /* blk count is 'length' field of cmd_cfg part of descriptor */ mmc->max_blk_count = CMD_CFG_LENGTH_MASK + 1; I tested that change locally, so after changing that, please resend and feel free to add: Reviewed-by: Kevin Hilman <khilman@baylibre.com> Tested-by: Kevin Hilman <khilman@baylibre.com> Kevin
Am 27.01.2017 um 19:28 schrieb Kevin Hilman: > Heiner Kallweit <hkallweit1@gmail.com> writes: > >> So far max_blk_count isn't set what results in a default of value 8 >> to be used (PAGE_SIZE / block size). >> >> Set max_blk_count to 256 as used in the uboot driver. >> >> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> > > Thanks for the patch. A minor comment below: > >> --- >> drivers/mmc/host/meson-gx-mmc.c | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c >> index 3308b5b6..030425be 100644 >> --- a/drivers/mmc/host/meson-gx-mmc.c >> +++ b/drivers/mmc/host/meson-gx-mmc.c >> @@ -799,6 +799,7 @@ static int meson_mmc_probe(struct platform_device *pdev) >> goto free_host; >> } >> >> + mmc->max_blk_count = 256; > > A step in the right direction, but the # blocks is actually a 9-bit > field (c.f. length field of cmd_cfg part of descriptor (bits 8:0). > > So this should be more like: > > /* blk count is 'length' field of cmd_cfg part of descriptor */ > mmc->max_blk_count = CMD_CFG_LENGTH_MASK + 1; > > I tested that change locally, so after changing that, please resend and > feel free to add: > max_blk_count = 0 means unlimited number of blocks. Therefore I think we have to go with: mmc->max_blk_count = CMD_CFG_LENGTH_MASK And I figured out later that we also have to set mmc->max_req_size. In my tests the system never read / wrote more than 8 blocks in a row, most likely because the upper block layers use 4k blocks. Therefore setting max_blk_count doesn't really provide a benefit but I think it's cleaner to expose the actual chip limit. Rgds, Heiner > Reviewed-by: Kevin Hilman <khilman@baylibre.com> > Tested-by: Kevin Hilman <khilman@baylibre.com> > > Kevin >
Heiner Kallweit <hkallweit1@gmail.com> writes: > Am 27.01.2017 um 19:28 schrieb Kevin Hilman: >> Heiner Kallweit <hkallweit1@gmail.com> writes: >> >>> So far max_blk_count isn't set what results in a default of value 8 >>> to be used (PAGE_SIZE / block size). >>> >>> Set max_blk_count to 256 as used in the uboot driver. >>> >>> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> >> >> Thanks for the patch. A minor comment below: >> >>> --- >>> drivers/mmc/host/meson-gx-mmc.c | 1 + >>> 1 file changed, 1 insertion(+) >>> >>> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c >>> index 3308b5b6..030425be 100644 >>> --- a/drivers/mmc/host/meson-gx-mmc.c >>> +++ b/drivers/mmc/host/meson-gx-mmc.c >>> @@ -799,6 +799,7 @@ static int meson_mmc_probe(struct platform_device *pdev) >>> goto free_host; >>> } >>> >>> + mmc->max_blk_count = 256; >> >> A step in the right direction, but the # blocks is actually a 9-bit >> field (c.f. length field of cmd_cfg part of descriptor (bits 8:0). >> >> So this should be more like: >> >> /* blk count is 'length' field of cmd_cfg part of descriptor */ >> mmc->max_blk_count = CMD_CFG_LENGTH_MASK + 1; >> >> I tested that change locally, so after changing that, please resend and >> feel free to add: >> > max_blk_count = 0 means unlimited number of blocks. Therefore I think > we have to go with: mmc->max_blk_count = CMD_CFG_LENGTH_MASK Ah, yes. Good catch. Kevin > And I figured out later that we also have to set mmc->max_req_size. > > In my tests the system never read / wrote more than 8 blocks in a row, > most likely because the upper block layers use 4k blocks. > > Therefore setting max_blk_count doesn't really provide a benefit but > I think it's cleaner to expose the actual chip limit. > > >> Reviewed-by: Kevin Hilman <khilman@baylibre.com> >> Tested-by: Kevin Hilman <khilman@baylibre.com> >> >> Kevin >>
diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c index 3308b5b6..030425be 100644 --- a/drivers/mmc/host/meson-gx-mmc.c +++ b/drivers/mmc/host/meson-gx-mmc.c @@ -799,6 +799,7 @@ static int meson_mmc_probe(struct platform_device *pdev) goto free_host; } + mmc->max_blk_count = 256; mmc->ops = &meson_mmc_ops; mmc_add_host(mmc);
So far max_blk_count isn't set what results in a default of value 8 to be used (PAGE_SIZE / block size). Set max_blk_count to 256 as used in the uboot driver. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> --- drivers/mmc/host/meson-gx-mmc.c | 1 + 1 file changed, 1 insertion(+)