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| author | Dmitry Osipenko <digetx@gmail.com> | 2019-08-12 00:00:33 +0300 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2019-11-11 14:55:25 +0100 |
| commit | c72396f941fb9d4113fb2fe18c00ae75c6c92c3e (patch) | |
| tree | ecaca0bdc4d8fca554bfdb84bb703f6dc150a3ea /drivers/memory | |
| parent | d039cf2834e9eb7cfd14f245172ca4f4a67c106b (diff) | |
| download | linux-c72396f941fb9d4113fb2fe18c00ae75c6c92c3e.tar.gz linux-c72396f941fb9d4113fb2fe18c00ae75c6c92c3e.tar.bz2 linux-c72396f941fb9d4113fb2fe18c00ae75c6c92c3e.zip | |
memory: tegra: Pre-configure debug register on Tegra20
The driver expects certain debug features to be disabled in order to
work properly. Let's disable them explicitly for consistency and to not
rely on a boot state.
Acked-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/memory')
| -rw-r--r-- | drivers/memory/tegra/tegra20-emc.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c index 1ce351dd5461..85c24f285fd4 100644 --- a/drivers/memory/tegra/tegra20-emc.c +++ b/drivers/memory/tegra/tegra20-emc.c @@ -22,6 +22,7 @@ #define EMC_INTSTATUS 0x000 #define EMC_INTMASK 0x004 +#define EMC_DBG 0x008 #define EMC_TIMING_CONTROL 0x028 #define EMC_RC 0x02c #define EMC_RFC 0x030 @@ -80,6 +81,12 @@ #define EMC_REFRESH_OVERFLOW_INT BIT(3) #define EMC_CLKCHANGE_COMPLETE_INT BIT(4) +#define EMC_DBG_READ_MUX_ASSEMBLY BIT(0) +#define EMC_DBG_WRITE_MUX_ACTIVE BIT(1) +#define EMC_DBG_FORCE_UPDATE BIT(2) +#define EMC_DBG_READ_DQM_CTRL BIT(9) +#define EMC_DBG_CFG_PRIORITY BIT(24) + static const u16 emc_timing_registers[] = { EMC_RC, EMC_RFC, @@ -396,7 +403,7 @@ tegra_emc_find_node_by_ram_code(struct device *dev) static int emc_setup_hw(struct tegra_emc *emc) { u32 intmask = EMC_REFRESH_OVERFLOW_INT | EMC_CLKCHANGE_COMPLETE_INT; - u32 emc_cfg; + u32 emc_cfg, emc_dbg; emc_cfg = readl_relaxed(emc->regs + EMC_CFG_2); @@ -419,6 +426,14 @@ static int emc_setup_hw(struct tegra_emc *emc) writel_relaxed(intmask, emc->regs + EMC_INTMASK); writel_relaxed(intmask, emc->regs + EMC_INTSTATUS); + /* ensure that unwanted debug features are disabled */ + emc_dbg = readl_relaxed(emc->regs + EMC_DBG); + emc_dbg |= EMC_DBG_CFG_PRIORITY; + emc_dbg &= ~EMC_DBG_READ_MUX_ASSEMBLY; + emc_dbg &= ~EMC_DBG_WRITE_MUX_ACTIVE; + emc_dbg &= ~EMC_DBG_FORCE_UPDATE; + writel_relaxed(emc_dbg, emc->regs + EMC_DBG); + return 0; } |