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SubjectRe: [PATCH v2 13/29] venus: helpers: make a commmon function for power_enable
Hi Stanimir,

On Tue, May 15, 2018 at 5:06 PM Stanimir Varbanov
<stanimir.varbanov@linaro.org> wrote:
>
> Make common function which will enable power when enabling/disabling
> clocks and also covers Venus 3xx/4xx versions.
>
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
> ---
> drivers/media/platform/qcom/venus/helpers.c | 51 +++++++++++++++++++++++++++++
> drivers/media/platform/qcom/venus/helpers.h | 2 ++
> drivers/media/platform/qcom/venus/vdec.c | 25 ++++----------
> drivers/media/platform/qcom/venus/venc.c | 25 ++++----------
> 4 files changed, 67 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
> index d9065cc8a7d3..2b21f6ed7502 100644
> --- a/drivers/media/platform/qcom/venus/helpers.c
> +++ b/drivers/media/platform/qcom/venus/helpers.c
> @@ -13,6 +13,7 @@
> *
> */
> #include <linux/clk.h>
> +#include <linux/iopoll.h>
> #include <linux/list.h>
> #include <linux/mutex.h>
> #include <linux/pm_runtime.h>
> @@ -24,6 +25,7 @@
> #include "core.h"
> #include "helpers.h"
> #include "hfi_helper.h"
> +#include "hfi_venus_io.h"
>
> struct intbuf {
> struct list_head list;
> @@ -781,3 +783,52 @@ void venus_helper_init_instance(struct venus_inst *inst)
> }
> }
> EXPORT_SYMBOL_GPL(venus_helper_init_instance);
> +
> +int venus_helper_power_enable(struct venus_core *core, u32 session_type,
> + bool enable)
> +{
> + void __iomem *ctrl, *stat;
> + u32 val;
> + int ret;
> +
> + if (!IS_V3(core) && !IS_V4(core))
> + return -EINVAL;
> +
> + if (IS_V3(core)) {
> + if (session_type == VIDC_SESSION_TYPE_DEC)
> + ctrl = core->base + WRAPPER_VDEC_VCODEC_POWER_CONTROL;
> + else
> + ctrl = core->base + WRAPPER_VENC_VCODEC_POWER_CONTROL;
> + if (enable)
> + writel(0, ctrl);
> + else
> + writel(1, ctrl);

nit: The value written is just !enable, but no strong preference.

> +
> + return 0;
> + }
> +
> + if (session_type == VIDC_SESSION_TYPE_DEC) {
> + ctrl = core->base + WRAPPER_VCODEC0_MMCC_POWER_CONTROL;
> + stat = core->base + WRAPPER_VCODEC0_MMCC_POWER_STATUS;
> + } else {
> + ctrl = core->base + WRAPPER_VCODEC1_MMCC_POWER_CONTROL;
> + stat = core->base + WRAPPER_VCODEC1_MMCC_POWER_STATUS;
> + }
> +
> + if (enable) {
> + writel(0, ctrl);
> +
> + ret = readl_poll_timeout(stat, val, val & BIT(1), 1, 100);
> + if (ret)
> + return ret;
> + } else {
> + writel(1, ctrl);
> +
> + ret = readl_poll_timeout(stat, val, !(val & BIT(1)), 1, 100);
> + if (ret)
> + return ret;
> + }

nit: The if/else could be just folded into code like below, but no
strong preference:

writel(!enable, ctrl);
ret = readl_poll_timeout(stat, val, !!(val & BIT(1)) == enable, 1, 100);
if (ret)
return ret;

> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(venus_helper_power_enable);
> diff --git a/drivers/media/platform/qcom/venus/helpers.h b/drivers/media/platform/qcom/venus/helpers.h
> index 971392be5df5..0e64aa95624a 100644
> --- a/drivers/media/platform/qcom/venus/helpers.h
> +++ b/drivers/media/platform/qcom/venus/helpers.h
> @@ -43,4 +43,6 @@ int venus_helper_set_color_format(struct venus_inst *inst, u32 fmt);
> void venus_helper_acquire_buf_ref(struct vb2_v4l2_buffer *vbuf);
> void venus_helper_release_buf_ref(struct venus_inst *inst, unsigned int idx);
> void venus_helper_init_instance(struct venus_inst *inst);
> +int venus_helper_power_enable(struct venus_core *core, u32 session_type,
> + bool enable);
> #endif
> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
> index 3b38bd1241b0..2bd81de6328a 100644
> --- a/drivers/media/platform/qcom/venus/vdec.c
> +++ b/drivers/media/platform/qcom/venus/vdec.c
> @@ -1123,26 +1123,21 @@ static int vdec_remove(struct platform_device *pdev)
> static __maybe_unused int vdec_runtime_suspend(struct device *dev)
> {
> struct venus_core *core = dev_get_drvdata(dev);
> + int ret;
>
> if (IS_V1(core))
> return 0;
>
> - if (IS_V3(core))
> - writel(0, core->base + WRAPPER_VDEC_VCODEC_POWER_CONTROL);
> - else if (IS_V4(core))
> - writel(0, core->base + WRAPPER_VCODEC0_MMCC_POWER_CONTROL);
> + ret = venus_helper_power_enable(core, VIDC_SESSION_TYPE_DEC, true);
>
> if (IS_V4(core))
> clk_disable_unprepare(core->core0_bus_clk);
>
> clk_disable_unprepare(core->core0_clk);
>
> - if (IS_V3(core))
> - writel(1, core->base + WRAPPER_VDEC_VCODEC_POWER_CONTROL);
> - else if (IS_V4(core))
> - writel(1, core->base + WRAPPER_VCODEC0_MMCC_POWER_CONTROL);
> + ret |= venus_helper_power_enable(core, VIDC_SESSION_TYPE_DEC, false);

If both calls return different error codes, the value of ret would
become garbage. (Same for rest of the patch.)

Best regards,
Tomasz

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