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Date: Wed, 25 Jul 2018 12:36:18 +0300
From: Stanimir Varbanov <stanimir.varbanov@...aro.org>
To: Vikash Garodia <vgarodia@...eaurora.org>, hverkuil@...all.nl,
mchehab@...nel.org, robh@...nel.org, mark.rutland@....com,
andy.gross@...aro.org, arnd@...db.de, bjorn.andersson@...aro.org
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
devicetree@...r.kernel.org, acourbot@...omium.org
Subject: Re: [PATCH v3 3/4] venus: firmware: add no TZ boot and shutdown
routine
Hi Vikash,
On 07/04/2018 10:06 PM, Vikash Garodia wrote:
> Video hardware is mainly comprised of vcodec subsystem and video
> control subsystem. Video control has ARM9 which executes the video
> firmware instructions whereas vcodec does the video frame processing.
> This change adds support to load the video firmware and bring ARM9
> out of reset for platforms which does not have trustzone.
>
> Signed-off-by: Vikash Garodia <vgarodia@...eaurora.org>
> ---
> drivers/media/platform/qcom/venus/core.c | 6 +-
> drivers/media/platform/qcom/venus/core.h | 5 ++
> drivers/media/platform/qcom/venus/firmware.c | 93 ++++++++++++++++++++++++++--
> drivers/media/platform/qcom/venus/firmware.h | 2 +-
> 4 files changed, 98 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
> index 75b9785..393994e 100644
> --- a/drivers/media/platform/qcom/venus/core.c
> +++ b/drivers/media/platform/qcom/venus/core.c
> @@ -76,7 +76,7 @@ static void venus_sys_error_handler(struct work_struct *work)
> hfi_core_deinit(core, true);
> hfi_destroy(core);
> mutex_lock(&core->lock);
> - venus_shutdown(core->dev);
> + venus_shutdown(core);
>
> pm_runtime_put_sync(core->dev);
>
> @@ -323,7 +323,7 @@ static int venus_probe(struct platform_device *pdev)
> err_core_deinit:
> hfi_core_deinit(core, false);
> err_venus_shutdown:
> - venus_shutdown(dev);
> + venus_shutdown(core);
> err_runtime_disable:
> pm_runtime_set_suspended(dev);
> pm_runtime_disable(dev);
> @@ -344,7 +344,7 @@ static int venus_remove(struct platform_device *pdev)
> WARN_ON(ret);
>
> hfi_destroy(core);
> - venus_shutdown(dev);
> + venus_shutdown(core);
> of_platform_depopulate(dev);
>
> pm_runtime_put_sync(dev);
> diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
> index eb5ee66..abe4ddf 100644
> --- a/drivers/media/platform/qcom/venus/core.h
> +++ b/drivers/media/platform/qcom/venus/core.h
> @@ -81,6 +81,10 @@ struct venus_caps {
> bool valid; /* used only for Venus v1xx */
> };
>
> +struct video_firmware {
> + struct device *dev;
> + struct iommu_domain *iommu_domain;
> +};
add an empty line here
> /**
> * struct venus_core - holds core parameters valid for all instances
> *
> @@ -129,6 +133,7 @@ struct venus_core {
> struct device *dev;
> struct device *dev_dec;
> struct device *dev_enc;
> + struct video_firmware fw;
> bool no_tz;
> struct mutex lock;
> struct list_head instances;
> diff --git a/drivers/media/platform/qcom/venus/firmware.c b/drivers/media/platform/qcom/venus/firmware.c
> index 6d6cca4..2a98d9e 100644
> --- a/drivers/media/platform/qcom/venus/firmware.c
> +++ b/drivers/media/platform/qcom/venus/firmware.c
> @@ -12,8 +12,10 @@
> *
> */
>
> +#include <linux/platform_device.h>
> #include <linux/device.h>
> #include <linux/firmware.h>
> +#include <linux/iommu.h>
> #include <linux/kernel.h>
> #include <linux/io.h>
> #include <linux/of.h>
> @@ -27,7 +29,8 @@
> #include "hfi_venus_io.h"
>
> #define VENUS_PAS_ID 9
> -#define VENUS_FW_MEM_SIZE (6 * SZ_1M)
> +#define VENUS_FW_MEM_SIZE (5 * SZ_1M)
This change should be subject to a separate patch.
> +#define VENUS_FW_START_ADDR 0x0
>
> static void venus_reset_cpu(struct venus_core *core)
> {
> @@ -121,6 +124,76 @@ static int venus_load_fw(struct venus_core *core, const char *fwname,
> return ret;
> }
>
> +int venus_boot_noTZ(struct venus_core *core, phys_addr_t mem_phys,
> + size_t mem_size)
please use lowercase for function names and correct the size_t mem_size
indentation.
> +{
> + struct iommu_domain *iommu;
s/iommu/iommu_dom ?
> + struct device *dev;
> + int ret;
> +
> + if (!core->fw.dev)
> + return -EPROBE_DEFER;
> +
> + dev = core->fw.dev;
you could make this initialization in declaration and check for !dev
above in the if statement.
> +
> + iommu = iommu_domain_alloc(&platform_bus_type);
> + if (!iommu) {
> + dev_err(dev, "Failed to allocate iommu domain\n");
> + return -ENOMEM;
> + }
> +
> + ret = iommu_attach_device(iommu, dev);
> + if (ret) {
> + dev_err(dev, "could not attach device\n");
> + goto err_attach;
> + }
> +
> + ret = iommu_map(iommu, VENUS_FW_START_ADDR, mem_phys, mem_size,
> + IOMMU_READ|IOMMU_WRITE|IOMMU_PRIV);
spaces between IOMMU_xxx
> + if (ret) {
> + dev_err(dev, "could not map video firmware region\n");
> + goto err_map;
> + }
add blank line here
> + core->fw.iommu_domain = iommu;
> + venus_reset_cpu(core);
> +
> + return 0;
> +
> +err_map:
> + iommu_detach_device(iommu, dev);
> +err_attach:
> + iommu_domain_free(iommu);
> + return ret;
> +}
> +
> +int venus_shutdown_noTZ(struct venus_core *core)
s/noTZ/notz
> +{
> + struct iommu_domain *iommu;
> + size_t unmapped = 0;
> + u32 reg;
> + struct device *dev = core->fw.dev;
> + void __iomem *reg_base = core->base;
> +
> + /* Assert the reset to ARM9 */
> + reg = readl_relaxed(reg_base + WRAPPER_A9SS_SW_RESET);
> + reg |= BIT(4);
can we have a define for bit 4, probably where we defined
WRAPPER_A9SS_SW_RESET register.
> + writel_relaxed(reg, reg_base + WRAPPER_A9SS_SW_RESET);
> +
> + /* Make sure reset is asserted before the mapping is removed */
> + mb();
mb() is used for compiler barrier as far as I know, isn't better to just
read the register and keep the comment?
> +
> + iommu = core->fw.iommu_domain;
> +
> + unmapped = iommu_unmap(iommu, VENUS_FW_START_ADDR, VENUS_FW_MEM_SIZE);
> + if (unmapped != VENUS_FW_MEM_SIZE)
> + dev_err(dev, "failed to unmap firmware\n");
> +
> + iommu_detach_device(iommu, dev);
> + iommu_domain_free(iommu);
> +
> + return 0;
> +}
> +
> int venus_boot(struct venus_core *core)
> {
> phys_addr_t mem_phys;
> @@ -139,10 +212,22 @@ int venus_boot(struct venus_core *core)
> return -EINVAL;
> }
>
> - return qcom_scm_pas_auth_and_reset(VENUS_PAS_ID);
> + if (core->no_tz)
> + ret = venus_boot_noTZ(core, mem_phys, mem_size);
> + else
> + ret = qcom_scm_pas_auth_and_reset(VENUS_PAS_ID);
> +
> + return ret;
> }
>
> -int venus_shutdown(struct device *dev)
> +int venus_shutdown(struct venus_core *core)
> {
> - return qcom_scm_pas_shutdown(VENUS_PAS_ID);
> + int ret = 0;
no need to initialize to 0
> +
> + if (core->no_tz)
> + ret = venus_shutdown_noTZ(core);
> + else
> + ret = qcom_scm_pas_shutdown(VENUS_PAS_ID);
> +
> + return ret;
> }
> diff --git a/drivers/media/platform/qcom/venus/firmware.h b/drivers/media/platform/qcom/venus/firmware.h
> index 36a5fc2..92736d6 100644
> --- a/drivers/media/platform/qcom/venus/firmware.h
> +++ b/drivers/media/platform/qcom/venus/firmware.h
> @@ -17,7 +17,7 @@
> struct device;
>
> int venus_boot(struct venus_core *core);
> -int venus_shutdown(struct device *dev);
> +int venus_shutdown(struct venus_core *core);
> int venus_set_hw_state(struct venus_core *core, bool suspend);
>
> #endif
>
--
regards,
Stan
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