+ Heiko
在 2016/8/26 14:38, Ziyuan Xu 写道:
Hi Shawn,
On 2016年08月26日 11:22, Shawn Lin wrote:
corecfg_clockmultipler indicates clock multiplier value of
programmable clock generator which should be the same value
of SDHCI_CAPABILITIES_1. The default value of the register,
corecfg_clockmultipler, is 0x10. But actually it is a mistake
corecfg_clockmultipler==>corecfg_clockmultiplier
by designer as our intention was to set it to be zero which
means we don't support programmable clock generator. So we have
to made it to be zero on bootloader which seems work fine until
made==>make
now. But now we find a issue that when deploying genpd support
a issue==>an issue
for it, the remove callback will trigger the genpd to poweroff the
power domain for sdhci-of-arasan which magage the controller, phy
magage==>manage
and corecfg_* stuff.
So when we do bind/unbind the driver, we have already reinit
do==>doing
the controller and phy, but without doing that for corecfg_*.
Regarding to only the corecfg_clockmultipler is wrong, let's
fix it by explicitly marking it to be zero when probing. With
this change, we could do bind/unbind successfully.
Reported-by: Ziyuan Xu <xzy.xu@xxxxxxxxxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci-of-arasan.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/mmc/host/sdhci-of-arasan.c
b/drivers/mmc/host/sdhci-of-arasan.c
index 0b3a9cf..c1eb263 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -67,10 +67,12 @@ struct sdhci_arasan_soc_ctl_field {
* accessible via the syscon API.
*
* @baseclkfreq: Where to find corecfg_baseclkfreq
+ * @clockmultiplier: Where to find corecfg_clockmultiplier
* @hiword_update: If true, use HIWORD_UPDATE to access the syscon
*/
struct sdhci_arasan_soc_ctl_map {
struct sdhci_arasan_soc_ctl_field baseclkfreq;
+ struct sdhci_arasan_soc_ctl_field clockmultiplier;
bool hiword_update;
};
@@ -100,6 +102,7 @@ struct sdhci_arasan_data {
static const struct sdhci_arasan_soc_ctl_map rk3399_soc_ctl_map = {
.baseclkfreq = { .reg = 0xf000, .width = 8, .shift = 8 },
+ .clockmultiplier = { .reg = 0xf02c, .width = 8, .shit = 0},
.hiword_update = true,
};
@@ -528,6 +531,12 @@ static int sdhci_arasan_probe(struct
platform_device *pdev)
ret);
goto err_pltfm_free;
}
+
+ if (of_device_is_compatible(pdev->dev.of_node,
+ "rockchip,rk3399-sdhci-5.1"))
+ sdhci_arasan_syscon_write(host,
+ &soc_ctl_map->clockmultiplier,
+ 0);
Variable soc_ctl_map is undefined in sdhci_arasan_probe(), please fix it.
Woops, I change the code a bit after generating patch, I will fix it.
Moreover, we can not access grf_emmccore/grf_emmcphy prior to enable
clk_ahb, so do it after clock enable.
Hrmm, we configure the grf vai CPU and the clock for accessing
grf is aclk_emmc_grf( I saw aclk_emmc_noc is critical and it seems we
should treat aclk_emmc_* the same way). I could move this after
enabling aclk_emmc, but that is a bogus critical for aclk_emmc_* to me
since it's off when disabling aclk_emmc, no?
}
sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
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--
Best Regards
Shawn Lin
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