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Now Internal and External memory controllers are memory interconnection
providers. This allows us to use interconnect API for tuning of memory
configuration. EMC driver now supports OPPs and DVFS. MC driver now
supports tuning of memory arbitration latency, which needs to be done
for ISO memory clients, like a Display client for example.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Peter Geis <pgwipeout@gmail.com>
Acked-by: Georgi Djakov <georgi.djakov@linaro.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201203192439.16177-4-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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initialization
Support hardware versioning, which is now required for Tegra20 EMC OPP.
Clean up OPP table initialization by using a error code returned by OPP
API for judging about the OPP table presence in a device-tree and remove
OPP regulator initialization because we're now going to use power domain
instead of a raw regulator. This puts Tegra20 EMC OPP preparation on par
with the Tegra30/124 EMC drivers.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201203192439.16177-3-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Clang warns:
drivers/memory/tegra/tegra30-emc.c:1275:15: warning: variable 'np' is uninitialized when used here [-Wuninitialized]
of_node_put(np);
^~
drivers/memory/tegra/tegra30-emc.c:1269:24: note: initialize the variable 'np' to silence this warning
There does not need to be an of_node_put call in this error handling
block after the shuffling of the np assignment. Remove it so there is
no use of uninitialized memory.
Fixes: 5e00fd90183a ("memory: tegra30-emc: Continue probing if timings are missing in device-tree")
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201119195244.1517236-1-natechancellor@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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According to Tegra X1 TRM, there are missing swgroups in the
tegra210_swgroups list. So this patch adds them to the list.
Note that the TEGRA_SWGROUP_GPU (in list) should be actually
TEGRA_SWGROUP_GPUB (in TRM), yet TEGRA_SWGROUP_GPU (in TRM) is not being
used -- only TEGRA_SWGROUP_GPUB (in TRM) is. So this patch does not add
TEGRA_SWGROUP_GPU (in TRM) and keeps TEGRA_SWGROUP_GPU (in list)
as it is.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201008003746.25659-6-nicoleotsuka@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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EMC driver will become mandatory after turning it into interconnect
provider because interconnect users, like display controller driver, will
fail to probe using newer device-trees that have interconnect properties.
Thus make EMC driver to probe even if timings are missing in device-tree.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201111011456.7875-9-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Add modularization support to the Tegra30 EMC driver, which now can be
compiled as a loadable kernel module.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201111011456.7875-8-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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The latency allowness is calculated based on buffering capabilities of
memory clients. Add FIFO sizes to the Tegra30 memory clients.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201111011456.7875-7-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Add devfreq support to the Tegra20 EMC driver. Memory utilization
statistics will be periodically polled from the memory controller and
appropriate minimum clock rate will be selected by the devfreq governor.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Link: https://lore.kernel.org/r/20201111011456.7875-5-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Remove IRQ number from error message since it doesn't add any useful
information, especially because this number is virtual.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201111011456.7875-6-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Factor out clk initialization and make it resource-managed. This makes
easier to follow code and will help to make further changes cleaner.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201111011456.7875-4-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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The dev_pm_opp_get_opp_table() shouldn't be used by drivers, use
dev_pm_opp_set_clkname() instead.
Suggested-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201111011456.7875-3-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Now Internal and External Memory Controllers are memory interconnection
providers. This allows us to use interconnect API for tuning of memory
configuration. EMC driver now supports OPPs and DVFS.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201104164923.21238-36-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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EMC driver will become mandatory after turning it into interconnect
provider because interconnect users, like display controller driver, will
fail to probe using newer device-trees that have interconnect properties.
Thus make EMC driver to probe even if timings are missing in device-tree.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201104164923.21238-35-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Add modularization support to the Tegra20 EMC driver, which now can be
compiled as a loadable kernel module.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201104164923.21238-34-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Add common SoC-agnostic ICC framework which turns Tegra Memory Controller
into a memory interconnection provider. This allows us to use interconnect
API for tuning of memory configurations.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Link: https://lore.kernel.org/r/20201104164923.21238-33-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Add missing PTC memory client latency allowness entry to the Tegra MC
drivers.
This prevents erroneous clearing of MC_INTSTATUS 0x0 register during
of the LA programming in tegra_mc_setup_latency_allowance() due to the
missing entry. Note that this patch doesn't fix any known problems.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201104164923.21238-32-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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The platform_get_irq() prints error message telling that interrupt is
missing, hence there is no need to duplicated that message in the drivers.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201104164923.21238-31-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Use devm_platform_ioremap_resource() helper which makes code a bit
cleaner.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201104164923.21238-30-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Multiple Tegra drivers need to retrieve Memory Controller and there is
duplication of the retrieval code among the drivers.
Add new devm_tegra_memory_controller_get() helper to remove the code's
duplication and to fix put_device() which was missed in the duplicated
code. Make EMC drivers to use the new helper.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201104164923.21238-29-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Cleanup the list of swgroups (ordering by register address) to prepare
for new ones.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201008003746.25659-4-nicoleotsuka@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Some def values are mismatched with Tegra X1 TRM, probably because
being copied from tegra124.c file.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201008003746.25659-3-nicoleotsuka@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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According to Tegra X1 TRM, ALLOWANCE_SESWR is located in field
[23:16] of register at address 0x3e0 with a reset value of 0x80
at register 0x3e0, while bit-1 of register 0xb98 is for enable
bit of seswr.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201008003746.25659-2-nicoleotsuka@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
Pull ARM SoC-related driver updates from Olof Johansson:
"Various driver updates for platforms. A bulk of this is smaller fixes
or cleanups, but some of the new material this time around is:
- Support for Nvidia Tegra234 SoC
- Ring accelerator support for TI AM65x
- PRUSS driver for TI platforms
- Renesas support for R-Car V3U SoC
- Reset support for Cortex-M4 processor on i.MX8MQ
There are also new socinfo entries for a handful of different SoCs and
platforms"
* tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (131 commits)
drm/mediatek: reduce clear event
soc: mediatek: cmdq: add clear option in cmdq_pkt_wfe api
soc: mediatek: cmdq: add jump function
soc: mediatek: cmdq: add write_s_mask value function
soc: mediatek: cmdq: add write_s value function
soc: mediatek: cmdq: add read_s function
soc: mediatek: cmdq: add write_s_mask function
soc: mediatek: cmdq: add write_s function
soc: mediatek: cmdq: add address shift in jump
soc: mediatek: mtk-infracfg: Fix kerneldoc
soc: amlogic: pm-domains: use always-on flag
reset: sti: reset-syscfg: fix struct description warnings
reset: imx7: add the cm4 reset for i.MX8MQ
dt-bindings: reset: imx8mq: add m4 reset
reset: Fix and extend kerneldoc
reset: reset-zynqmp: Added support for Versal platform
dt-bindings: reset: Updated binding for Versal reset driver
reset: imx7: Support module build
soc: fsl: qe: Remove unnessesary check in ucc_set_tdm_rxtx_clk
soc: fsl: qman: convert to use be32_add_cpu()
...
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Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Link: https://lore.kernel.org/r/20200917125114.103598-1-miaoqinglang@huawei.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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According to Tegra210 TRM, the default value of TLB_ACTIVE_LINES
field of register MC_SMMU_TLB_CONFIG_0 is 0x30. So num_tlb_lines
should be 48 (0x30) rather than 32 (0x20).
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20200917113155.13438-3-nicoleotsuka@gmail.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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tegra210_emc_r21021_periodic_compensation
In function tegra210_emc_r21021_periodic_compensation when calculate
emc_cfg EMC_CFG_DRAM_CLKSTOP_PD is duplicated.
Signed-off-by: Ye Bin <yebin10@huawei.com>
Link: https://lore.kernel.org/r/20200903021542.315195-1-yebin10@huawei.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Commit 63a613fdb16c ("memory: tegra: Add gr2d and gr3d to DRM IOMMU
group") added the GPU to the DRM IOMMU group, which doesn't make any
sense. This causes problems when Nouveau tries to attach to the SMMU
and causes it to fall back to using the DMA API.
Remove the GPU from the DRM groups to restore the old behaviour. The
GPU should always have its own IOMMU domain to make sure it can map
buffers into contiguous chunks (for big page support) without getting
in the way of mappings from the DRM group.
Cc: <stable@vger.kernel.org>
Fixes: 63a613fdb16c ("memory: tegra: Add gr2d and gr3d to DRM IOMMU group")
Reported-by: Matias Zuniga <matias.nicolas.zc@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20200901153248.1831263-1-thierry.reding@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Common pattern of handling deferred probe can be simplified with
dev_err_probe(). Less code and the error value gets printed.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200828153747.22358-2-krzk@kernel.org
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According to Tegra X1 (Tegra210) TRM, the APEW field is between
[23:16] so the shift bit for apew should be 16 accordingly.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Link: https://lore.kernel.org/r/20200818095121.13645-1-nicoleotsuka@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
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Use tabs instead of spaces for indentation.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200724074038.5597-25-krzk@kernel.org
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Ensure that the driver will bind against the Tegra132 instantiation of
the external memory controller. While the two are roughly the same from
a capability perspective, they do require some incompatible changes to
the programming sequences and therefore need separate compatible
strings.
Signed-off-by: Thierry Reding <treding@nvidia.com>
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Commit a127e690b051 ("memory: tegra: Add support for the Tegra194 memory
controller") and commit 4e04b88633ae ("memory: tegra: Only include
support for enabled SoCs") incorrectly added the KCONFIG variables
CONFIG_ARCH_TEGRA186_SOC and CONFIG_ARCH_TEGRA194_SOC to the Tegra EMC
driver. These KCONFIG variables do not exist and prevent the EMC driver
from being probed on Tegra186 and Tegra194. These KCONFIG variable
names are simply missing one underscore and so fix this by adding the
necessary underscore to the variable names.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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The debugfs_create_dir() function never returns NULL and anyway the
correct behavior is to ignore errors in this situation. The
debugfs_create_file() will become a no-op if "emc->debugfs.root" is an
error pointer.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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The suspend/resume functions have no callers depending on
configuration, so they must be marked __maybe_unused to
avoid these harmless warnings:
drivers/memory/tegra/tegra186.c:1578:12: error: 'tegra186_mc_resume' defined but not used [-Werror=unused-function]
1578 | static int tegra186_mc_resume(struct device *dev)
| ^~~~~~~~~~~~~~~~~~
drivers/memory/tegra/tegra186.c:1573:12: error: 'tegra186_mc_suspend' defined but not used [-Werror=unused-function]
1573 | static int tegra186_mc_suspend(struct device *dev)
| ^~~~~~~~~~~~~~~~~~~
Fixes: 177602b00641 ("memory: tegra: Add system sleep support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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The Tegra EMC scaling support code is not a clock provider, but merely a
clock consumer, and thus does not need to include
<linux/clk-provider.h>.
Fixes: 0bf368c5b2cf ("memory: tegra: Add EMC scaling support code for Tegra210")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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The call to tegra_bpmp_get() must be balanced by a call to
tegra_bpmp_put() in case of error, as already done in the remove
function.
Add an error handling path and corresponding goto.
Fixes: 52d15dd23f0b ("memory: tegra: Support DVFS on Tegra186 and later")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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The memory clock-rate change could be running on a non-boot CPU, while the
boot CPU handles the EMC interrupt. This introduces an unnecessary latency
since boot CPU should handle the interrupt and then notify the sibling CPU
about clock-rate change completion. In some rare cases boot CPU could be
in uninterruptible state for a significant time (like in a case of KASAN +
NFS root), it could get to the point that completion timeouts before boot
CPU gets a chance to handle interrupt. The solution is to get rid of the
completion and replace it with interrupt-status polling.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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The memory clock-rate change could be running on a non-boot CPU, while the
boot CPU handles the EMC interrupt. This introduces an unnecessary latency
since boot CPU should handle the interrupt and then notify the sibling CPU
about clock-rate change completion. In some rare cases boot CPU could be
in uninterruptible state for a significant time (like in a case of KASAN +
NFS root), it could get to the point that completion timeouts before boot
CPU gets a chance to handle interrupt. The solution is to get rid of the
completion and replace it with interrupt-status polling.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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Derated timings are used to ensure that the memory chips keep operating
correctly at high temperatures. This adds code to support polling of the
chip operating state when high temperatures are measured on the chip and
change the refresh mode accordingly. Under very high temperatures, the
driver will switch to the derated tables to ensure proper operation of
the memory chips.
Signed-off-by: Thierry Reding <treding@nvidia.com>
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This patch includes the sequence for clock tuning and the dynamic
training mechanism for the clock above 800MHz.
And historically there have been different sequences to change the EMC
clock. The sequence to be used is specified in the EMC table.
However, for the currently supported upstreaming platform, only the most
recent sequence is used. So only support that in this patch.
Based on the work of Peter De Schrijver <pdeschrijver@nvidia.com>.
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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This is the initial patch for Tegra210 EMC frequency scaling. It has the
code to program various aspects of the EMC that are standardized, but it
does not yet include the specific programming sequence needed for clock
scaling.
The driver is designed to support LPDDR4 SDRAM. Devices that use LPDDR4
need to perform training of the RAM before it can be used. Firmware will
perform this training during early boot and pass a table of supported
frequencies to the kernel via device tree.
For the frequencies above 800 MHz, periodic retraining is needed to
compensate for changes in timing. This periodic training will have to be
performed until the frequency drops back to or below 800 MHz.
This driver provides helpers used during this runtime retraining that
will be used by the sequence specific code in a follow-up patch.
Based on work by Peter De Schrijver <pdeschrijver@nvidia.com>.
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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Replace the symbolic permissions with octals in order to make them
readable.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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Correctly set clk rate-range if number of available timings is zero.
This fixes noisy "invalid range [4294967295, 0]" error messages during
boot.
Fixes: 6b9acd935546 ("memory: tegra: Refashion EMC debugfs interface on Tegra124")
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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Correctly set clk rate-range if number of available timings is zero.
This fixes noisy "invalid range [4294967295, 0]" error messages during
boot.
Fixes: 8cee32b40040 ("memory: tegra: Implement EMC debugfs interface on Tegra30")
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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Correctly set clk rate-range if number of available timings is zero.
This fixes noisy "invalid range [4294967295, 0]" error messages during
boot.
Fixes: 8209eefa3d37 ("memory: tegra: Implement EMC debugfs interface on Tegra20")
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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The code waits for auto calibration to be finished and not to be disabled.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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Previously there was a problem where a late handshake handling caused
a memory corruption, this problem was resolved by issuing calibration
command right after changing the timing, but looks like the solution
wasn't entirely correct since calibration interval could be disabled as
well. Now programming sequence is completed immediately after receiving
handshake from CaR, without potentially long delays and in accordance to
the TRM's programming guide.
Secondly, the TRM's programming guide suggests to flush EMC writes by
reading any *MC* register before doing CaR changes. This is also addressed
now.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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The current code doesn't prevent race conditions of suspend/resume vs CCF.
Let's take exclusive control over the EMC clock during suspend in a way
that is free from race conditions.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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According to Tegra X1 (Tegra210) TRM, the reset value of xusb_hostr
field (bit [7:0]) should be 0x7a. So this patch simply corrects it.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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The memory and external memory controllers on Tegra194 are very similar
to their predecessors from Tegra186. Add the necessary SoC-specific data
to support the newer versions.
Signed-off-by: Thierry Reding <treding@nvidia.com>
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