On Fri, Aug 3, 2018 at 5:06 PM Jordan Crouse <jcrouse@xxxxxxxxxxxxxx> wrote:
>
> Set the correct initial GPU frequency on the GMU just after turning on
> or resetting the GMU so it doesn't keep running at a horribly slow
> speed.
>
> Signed-off-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
*much* better :-)
Tested-by: Rob Clark <robdclark@xxxxxxxxx>
> ---
> drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index c49ca275a3b3..f8227f38b8cd 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -65,6 +65,26 @@ static bool a6xx_gmu_gx_is_on(struct a6xx_gmu *gmu)
> A6XX_GMU_SPTPRAC_PWR_CLK_STATUS_GX_HM_CLK_OFF));
> }
>
> +static int a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
> +{
> + gmu_write(gmu, REG_A6XX_GMU_DCVS_ACK_OPTION, 0);
> +
> + gmu_write(gmu, REG_A6XX_GMU_DCVS_PERF_SETTING,
> + ((index << 24) & 0xff) | (3 & 0xf));
> +
> + /*
> + * Send an invalid index as a vote for the bus bandwidth and let the
> + * firmware decide on the right vote
> + */
> + gmu_write(gmu, REG_A6XX_GMU_DCVS_BW_SETTING, 0xff);
> +
> + /* Set and clear the OOB for DCVS to trigger the GMU */
> + a6xx_gmu_set_oob(gmu, GMU_OOB_DCVS_SET);
> + a6xx_gmu_clear_oob(gmu, GMU_OOB_DCVS_SET);
> +
> + return gmu_read(gmu, REG_A6XX_GMU_DCVS_RETURN);
> +}
> +
> static bool a6xx_gmu_check_idle_level(struct a6xx_gmu *gmu)
> {
> u32 val;
> @@ -602,6 +622,9 @@ int a6xx_gmu_reset(struct a6xx_gpu *a6xx_gpu)
> if (!ret)
> ret = a6xx_hfi_start(gmu, GMU_COLD_BOOT);
>
> + /* Set the GPU back to the highest power frequency */
> + a6xx_gmu_set_freq(gmu, gmu->nr_gpu_freqs - 1);
> +
> if (ret)
> a6xx_gmu_clear_oob(gmu, GMU_OOB_BOOT_SLUMBER);
>
> @@ -635,6 +658,9 @@ int a6xx_gmu_resume(struct a6xx_gpu *a6xx_gpu)
>
> ret = a6xx_hfi_start(gmu, status);
>
> + /* Set the GPU to the highest power frequency */
> + a6xx_gmu_set_freq(gmu, gmu->nr_gpu_freqs - 1);
> +
> out:
> /* Make sure to turn off the boot OOB request on error */
> if (ret)
> --
> 2.18.0
>
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