diff options
| author | Stephen Warren <swarren@nvidia.com> | 2012-01-26 15:12:23 +0000 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2012-02-06 18:25:01 -0800 |
| commit | 76c2f6e513b3df8031dda383838da2a3820adbe3 (patch) | |
| tree | fbdcb3cb9b703ff30d5a6906fba3b8f005ac46a7 /arch/arm/mach-tegra/tegra2_emc.c | |
| parent | 3391811c4294da42e412ec5f83a251caf05869a4 (diff) | |
ARM: tegra: Fix EMC pdata initialization from registers
Commit d91eeb0 "ARM: tegra: emc: device tree support" modified the EMC
driver to create an EMC table from existing register settings when none
was provided through platform data or device tree. This code wrote the
wrong clock rate into the table; the actual rate in Hz, rather than the
expected half-rate in KHz. This caused the BUG_ON in
tegra2_emc_clk_round_rate() to fire, since that enormous rate could not
be generated.
Fixes:
[ 2.425921] kernel BUG at arch/arm/mach-tegra/tegra2_clocks.c:1158!
...
[ 2.618766] [<c001c0e8>] (tegra2_emc_clk_round_rate+0x58/0x70) from [<c00198b4>] (clk_round_rate+0x48/0x68)
[ 2.628494] [<c00198b4>] (clk_round_rate+0x48/0x68) from [<c0019cc0>] (clk_set_rate_locked+0x40/0x68)
[ 2.637707] [<c0019cc0>] (clk_set_rate_locked+0x40/0x68) from [<c0019d10>] (clk_set_rate+0x28/0x40)
[ 2.646754] [<c0019d10>] (clk_set_rate+0x28/0x40) from [<c001ffc8>] (tegra_update_cpu_speed+0x54/0x144)
[ 2.656144] [<c001ffc8>] (tegra_update_cpu_speed+0x54/0x144) from [<c002016c>] (tegra_target+0xb4/0xe0)
[ 2.665538] [<c002016c>] (tegra_target+0xb4/0xe0) from [<c01a96c0>] (__cpufreq_driver_target+0x88/0xa4)
[ 2.674931] [<c01a96c0>] (__cpufreq_driver_target+0x88/0xa4) from [<c01ac9d0>] (dbs_check_cpu+0x324/0x340)
[ 2.684582] [<c01ac9d0>] (dbs_check_cpu+0x324/0x340) from [<c01aca40>] (do_dbs_timer+0x54/0xf4)
[ 2.693277] [<c01aca40>] (do_dbs_timer+0x54/0xf4) from [<c00369a8>] (process_one_work+0x1d4/0x320)
[ 2.702225] [<c00369a8>] (process_one_work+0x1d4/0x320) from [<c0036f34>] (worker_thread+0x134/0x230)
[ 2.711437] [<c0036f34>] (worker_thread+0x134/0x230) from [<c003add0>] (kthread+0x80/0x8c)
[ 2.719700] [<c003add0>] (kthread+0x80/0x8c) from [<c000ebf4>] (kernel_thread_exit+0x0/0x8)
Reported-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
[olof: fixed calculation of printed values]
Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/mach-tegra/tegra2_emc.c')
| -rw-r--r-- | arch/arm/mach-tegra/tegra2_emc.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/mach-tegra/tegra2_emc.c b/arch/arm/mach-tegra/tegra2_emc.c index 52df6ca3629..5070d833bdd 100644 --- a/arch/arm/mach-tegra/tegra2_emc.c +++ b/arch/arm/mach-tegra/tegra2_emc.c @@ -284,16 +284,16 @@ static struct tegra_emc_pdata __devinit *tegra_emc_fill_pdata(struct platform_de pdata->tables = devm_kzalloc(&pdev->dev, sizeof(*pdata->tables), GFP_KERNEL); - pdata->tables[0].rate = clk_get_rate(c); + pdata->tables[0].rate = clk_get_rate(c) / 2 / 1000; for (i = 0; i < TEGRA_EMC_NUM_REGS; i++) pdata->tables[0].regs[i] = emc_readl(emc_reg_addr[i]); pdata->num_tables = 1; - khz = pdata->tables[0].rate / 1000; + khz = pdata->tables[0].rate; dev_info(&pdev->dev, "no tables provided, using %ld kHz emc, " - "%ld kHz mem\n", khz, khz/2); + "%ld kHz mem\n", khz * 2, khz); return pdata; } |