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Subject: Re: [v1] drm/msm/disp/dpu1: icc path needs to be set before dpu
 runtime resume
To:     Kalyan Thota <kalyan_t@codeaurora.org>, y@qualcomm.com,
        dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
        freedreno@lists.freedesktop.org, devicetree@vger.kernel.org
Cc:     Kalyan Thota <kalyant@codeaurora.org>,
        linux-kernel@vger.kernel.org, robdclark@gmail.com,
        dianders@chromium.org, mkrishn@codeaurora.org, hywu@google.com,
        mka@google.com, midean@google.com
References: <y> <1616404632-13693-1-git-send-email-kalyan_t@codeaurora.org>
From:   Steev Klimaszewski <steev@kali.org>
Message-ID: <823f7f00-444e-8e22-e8d0-2ced97e4c291@kali.org>
Date:   Tue, 30 Mar 2021 13:34:59 -0500
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On 3/22/21 4:17 AM, Kalyan Thota wrote:
> From: Kalyan Thota <kalyant@codeaurora.org>
>
> DPU runtime resume will request for a min vote on the AXI bus as
> it is a necessary step before turning ON the AXI clock.
>
> The change does below
> 1) Move the icc path set before requesting runtime get_sync.
> 2) remove the dependency of hw catalog for min ib vote
> as it is initialized at a later point.
>
> Signed-off-by: Kalyan Thota <kalyan_t@codeaurora.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index ed636f1..cab387f 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -44,6 +44,8 @@
>  #define DPU_DEBUGFS_DIR "msm_dpu"
>  #define DPU_DEBUGFS_HWMASKNAME "hw_log_mask"
>  
> +#define MIN_IB_BW	400000000ULL /* Min ib vote 400MB */
> +
>  static int dpu_kms_hw_init(struct msm_kms *kms);
>  static void _dpu_kms_mmu_destroy(struct dpu_kms *dpu_kms);
>  
> @@ -932,6 +934,9 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
>  		DPU_DEBUG("REG_DMA is not defined");
>  	}
>  
> +	if (of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss"))
> +		dpu_kms_parse_data_bus_icc_path(dpu_kms);
> +
>  	pm_runtime_get_sync(&dpu_kms->pdev->dev);
>  
>  	dpu_kms->core_rev = readl_relaxed(dpu_kms->mmio + 0x0);
> @@ -1037,9 +1042,6 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
>  
>  	dpu_vbif_init_memtypes(dpu_kms);
>  
> -	if (of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss"))
> -		dpu_kms_parse_data_bus_icc_path(dpu_kms);
> -
>  	pm_runtime_put_sync(&dpu_kms->pdev->dev);
>  
>  	return 0;
> @@ -1196,10 +1198,10 @@ static int __maybe_unused dpu_runtime_resume(struct device *dev)
>  
>  	ddev = dpu_kms->dev;
>  
> +	WARN_ON(!(dpu_kms->num_paths));
>  	/* Min vote of BW is required before turning on AXI clk */
>  	for (i = 0; i < dpu_kms->num_paths; i++)
> -		icc_set_bw(dpu_kms->path[i], 0,
> -			dpu_kms->catalog->perf.min_dram_ib);
> +		icc_set_bw(dpu_kms->path[i], 0, Bps_to_icc(MIN_IB_BW));
>  
>  	rc = msm_dss_enable_clk(mp->clk_config, mp->num_clk, true);
>  	if (rc) {

With this patch now applied to 5.12-rc5, I am seeing the following when
booting the Lenovo Yoga C630 -

Mar 30 13:16:03 c630 kernel: [    2.038491] ------------[ cut here ]------------
Mar 30 13:16:03 c630 kernel: [    2.038495] WARNING: CPU: 3 PID: 125 at drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c:1196 dpu_runtime_resume+0xc0/0xf0 [msm]
Mar 30 13:16:03 c630 kernel: [    2.038551] Modules linked in: ti_sn65dsi86 i2c_hid_of crct10dif_ce msm rtc_pm8xxx llcc_qcom ocmem drm_kms_helper i2c_qcom_geni phy_qcom_qusb2 ipa(+) qcom_common qcom_glink_smem qmi_helpers mdt_loader panel_simple drm pwm_bl
Mar 30 13:16:03 c630 kernel: [    2.038599] CPU: 3 PID: 125 Comm: kworker/3:1 Not tainted 5.12.0-rc5 #1
Mar 30 13:16:03 c630 kernel: [    2.038605] Hardware name: LENOVO 81JL/LNVNB161216, BIOS 9UCN33WW(V2.06) 06/ 4/2019
Mar 30 13:16:03 c630 kernel: [    2.038610] Workqueue: events deferred_probe_work_func
Mar 30 13:16:03 c630 kernel: [    2.038621] pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)
Mar 30 13:16:03 c630 kernel: [    2.038627] pc : dpu_runtime_resume+0xc0/0xf0 [msm]
Mar 30 13:16:03 c630 kernel: [    2.038674] lr : pm_generic_runtime_resume+0x30/0x50
Mar 30 13:16:03 c630 kernel: [    2.038683] sp : ffff800010b9b7e0
Mar 30 13:16:03 c630 kernel: [    2.038685] x29: ffff800010b9b7e0 x28: 0000000000000000 
Mar 30 13:16:03 c630 kernel: [    2.038692] x27: 0000000000000000 x26: ffff6b42c0c16cf4 
Mar 30 13:16:03 c630 kernel: [    2.038698] x25: 000000007965f7df x24: 0000000000000001 
Mar 30 13:16:03 c630 kernel: [    2.038705] x23: ffff6b42c0a34180 x22: ffffda2e0cc5b3d0 
Mar 30 13:16:03 c630 kernel: [    2.038712] x21: ffffda2e0b3ed6a0 x20: ffff6b42c6845000 
Mar 30 13:16:03 c630 kernel: [    2.038718] x19: ffff6b42c6851080 x18: ffffda2e0cce1220 
Mar 30 13:16:03 c630 kernel: [    2.038725] x17: ffffda2e0cce1238 x16: ffffda2e0b23e5f0 
Mar 30 13:16:03 c630 kernel: [    2.038731] x15: 0000000040000000 x14: 0000000000000000 
Mar 30 13:16:03 c630 kernel: [    2.038738] x13: ffff6b42c5f0b5b0 x12: 0000000000000000 
Mar 30 13:16:03 c630 kernel: [    2.038744] x11: 0000000000000001 x10: 0000000000003fff 
Mar 30 13:16:03 c630 kernel: [    2.038750] x9 : 0000000000000000 x8 : 0000000000000000 
Mar 30 13:16:03 c630 kernel: [    2.038755] x7 : 0000000000000000 x6 : 000000000c473b7e 
Mar 30 13:16:03 c630 kernel: [    2.038761] x5 : 00ffffffffffffff x4 : 00221806fff8f800 
Mar 30 13:16:03 c630 kernel: [    2.038768] x3 : 0000000000000018 x2 : ffffda2dc3d34320 
Mar 30 13:16:03 c630 kernel: [    2.038774] x1 : 0000000000000000 x0 : 0000000000000000 
Mar 30 13:16:03 c630 kernel: [    2.038781] Call trace:
Mar 30 13:16:03 c630 kernel: [    2.038784]  dpu_runtime_resume+0xc0/0xf0 [msm]
Mar 30 13:16:03 c630 kernel: [    2.038831]  pm_generic_runtime_resume+0x30/0x50
Mar 30 13:16:03 c630 kernel: [    2.038836]  __genpd_runtime_resume+0x30/0xb0
Mar 30 13:16:03 c630 kernel: [    2.038842]  genpd_runtime_resume+0x90/0x250
Mar 30 13:16:03 c630 kernel: [    2.038848]  __rpm_callback+0x90/0x160
Mar 30 13:16:03 c630 kernel: [    2.038854]  rpm_callback+0x24/0x84
Mar 30 13:16:03 c630 kernel: [    2.038859]  rpm_resume+0x450/0x6ec
Mar 30 13:16:03 c630 kernel: [    2.038865]  __pm_runtime_resume+0x3c/0x90
Mar 30 13:16:03 c630 kernel: [    2.038870]  dpu_kms_hw_init+0x124/0x5dc [msm]
Mar 30 13:16:03 c630 kernel: [    2.038918]  msm_drm_bind+0x468/0x594 [msm]
Mar 30 13:16:03 c630 kernel: [    2.038965]  try_to_bring_up_master+0x164/0x1d0
Mar 30 13:16:03 c630 kernel: [    2.038973]  component_master_add_with_match+0xb8/0x100
Mar 30 13:16:03 c630 kernel: [    2.038979]  msm_pdev_probe+0x260/0x300 [msm]
Mar 30 13:16:03 c630 kernel: [    2.039026]  platform_probe+0x68/0xe0
Mar 30 13:16:03 c630 kernel: [    2.039032]  really_probe+0xe4/0x4c0
Mar 30 13:16:03 c630 kernel: [    2.039036]  driver_probe_device+0x58/0xc0
Mar 30 13:16:03 c630 kernel: [    2.039040]  __device_attach_driver+0xa8/0x104
Mar 30 13:16:03 c630 kernel: [    2.039045]  bus_for_each_drv+0x78/0xd0
Mar 30 13:16:03 c630 kernel: [    2.039051]  __device_attach+0xd8/0x17c
Mar 30 13:16:03 c630 kernel: [    2.039055]  device_initial_probe+0x14/0x20
Mar 30 13:16:03 c630 kernel: [    2.039059]  bus_probe_device+0x9c/0xa4
Mar 30 13:16:03 c630 kernel: [    2.039065]  deferred_probe_work_func+0x74/0xb0
Mar 30 13:16:03 c630 kernel: [    2.039069]  process_one_work+0x1d0/0x494
Mar 30 13:16:03 c630 kernel: [    2.039076]  worker_thread+0x13c/0x470
Mar 30 13:16:03 c630 kernel: [    2.039080]  kthread+0x158/0x160
Mar 30 13:16:03 c630 kernel: [    2.039085]  ret_from_fork+0x10/0x34
Mar 30 13:16:03 c630 kernel: [    2.039093] ---[ end trace 65a4c9cc3f59c59a ]---
Mar 30 13:16:03 c630 kernel: [    2.039124] [drm:dpu_kms_hw_init:943] dpu hardware revision:0x40000000