From: Robin Murphy <robin.murphy@arm.com>
To: Sascha Hauer <s.hauer@pengutronix.de>, dri-devel@lists.freedesktop.org
Cc: linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org,
kernel@pengutronix.de, "Andy Yan" <andy.yan@rock-chips.com>,
"Benjamin Gaignard" <benjamin.gaignard@collabora.com>,
"Michael Riesch" <michael.riesch@wolfvision.net>,
"Sandy Huang" <hjc@rock-chips.com>,
"Heiko Stübner" <heiko@sntech.de>,
"Peter Geis" <pgwipeout@gmail.com>
Subject: Re: [PATCH v9 01/23] clk: rk3568: Mark hclk_vo as critical
Date: Wed, 6 Apr 2022 12:15:33 +0100 [thread overview]
Message-ID: <bb429523-6a06-33ab-2289-22ef5fa8b0cb@arm.com> (raw)
In-Reply-To: <20220328151116.2034635-2-s.hauer@pengutronix.de>
On 2022-03-28 16:10, Sascha Hauer wrote:
> Whenever pclk_vo is enabled hclk_vo must be enabled as well. This is
> described in the Reference Manual as:
>
> | 2.8.6 NIU Clock gating reliance
> |
> | A part of niu clocks have a dependence on another niu clock in order to
> | sharing the internal bus. When these clocks are in use, another niu
> | clock must be opened, and cannot be gated. These clocks and the special
> | clock on which they are relied are as following:
> |
> | Clocks which have dependency The clock which can not be gated
> | -----------------------------------------------------------------
> | ...
> | pclk_vo_niu, hclk_vo_s_niu hclk_vo_niu
> | ...
>
> The clock framework doesn't offer a way to enable clock B whenever clock A is
> enabled, at least not when B is not an ancestor of A. Workaround this by
> marking hclk_vo as critical so it is never disabled. This is suboptimal in
> terms of power consumption, but a stop gap solution until the clock framework
> has a way to deal with this.
>
> We have this clock tree:
>
> | aclk_vo 2 2 0 300000000 0 0 50000 Y
> | aclk_hdcp 0 0 0 300000000 0 0 50000 N
> | pclk_vo 2 3 0 75000000 0 0 50000 Y
> | pclk_edp_ctrl 0 0 0 75000000 0 0 50000 N
> | pclk_dsitx_1 0 0 0 75000000 0 0 50000 N
> | pclk_dsitx_0 1 2 0 75000000 0 0 50000 Y
> | pclk_hdmi_host 1 2 0 75000000 0 0 50000 Y
> | pclk_hdcp 0 0 0 75000000 0 0 50000 N
> | hclk_vo 2 5 0 150000000 0 0 50000 Y
> | hclk_hdcp 0 0 0 150000000 0 0 50000 N
> | hclk_vop 0 2 0 150000000 0 0 50000 N
>
> Without this patch the edp, dsitx, hdmi and hdcp driver would enable their
> clocks which then enables pclk_vo, but hclk_vo stays disabled and register
> accesses just hang. hclk_vo is enabled by the VOP2 driver, so reproducibility
> of this issue depends on the probe order.
FWIW,
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> ---
>
> Notes:
> Changes since v8:
> - new patch
>
> drivers/clk/rockchip/clk-rk3568.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/clk/rockchip/clk-rk3568.c b/drivers/clk/rockchip/clk-rk3568.c
> index 63dfbeeeb06d9..62694d95173ab 100644
> --- a/drivers/clk/rockchip/clk-rk3568.c
> +++ b/drivers/clk/rockchip/clk-rk3568.c
> @@ -1591,6 +1591,7 @@ static const char *const rk3568_cru_critical_clocks[] __initconst = {
> "hclk_php",
> "pclk_php",
> "hclk_usb",
> + "hclk_vo",
> };
>
> static const char *const rk3568_pmucru_critical_clocks[] __initconst = {
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next prev parent reply other threads:[~2022-04-06 11:16 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-28 15:10 [PATCH v9 00/23] drm/rockchip: RK356x VOP2 support Sascha Hauer
2022-03-28 15:10 ` [PATCH v9 01/23] clk: rk3568: Mark hclk_vo as critical Sascha Hauer
2022-03-29 13:22 ` Dmitry Osipenko
2022-04-06 11:15 ` Robin Murphy [this message]
2022-03-28 15:10 ` [PATCH v9 02/23] drm/rockchip: Embed drm_encoder into rockchip_decoder Sascha Hauer
2022-03-28 15:10 ` [PATCH v9 03/23] drm/rockchip: Add crtc_endpoint_id to rockchip_encoder Sascha Hauer
2022-03-28 15:10 ` [PATCH v9 04/23] drm/rockchip: dw_hdmi: rename vpll clock to reference clock Sascha Hauer
2022-03-28 15:10 ` [PATCH v9 05/23] dt-bindings: display: rockchip: dw-hdmi: use "ref" as clock name Sascha Hauer
2022-03-28 15:10 ` [PATCH v9 06/23] arm64: dts: rockchip: rk3399: rename HDMI ref clock to 'ref' Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 07/23] drm/rockchip: dw_hdmi: add rk3568 support Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 08/23] dt-bindings: display: rockchip: dw-hdmi: Add compatible for rk3568 HDMI Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 09/23] drm/rockchip: dw_hdmi: add regulator support Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 10/23] dt-bindings: display: rockchip: dw-hdmi: Add " Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 11/23] drm/rockchip: dw_hdmi: Use auto-generated tables Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 12/23] drm/rockchip: dw_hdmi: drop mode_valid hook Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 13/23] drm/rockchip: dw_hdmi: Set cur_ctr to 0 always Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 14/23] drm/rockchip: dw_hdmi: add default 594Mhz clk for 4K@60hz Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 15/23] dt-bindings: display: rockchip: dw-hdmi: Make unwedge pinctrl optional Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 16/23] arm64: dts: rockchip: rk356x: Add VOP2 nodes Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 17/23] arm64: dts: rockchip: rk356x: Add HDMI nodes Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 18/23] arm64: dts: rockchip: rk3568-evb: Enable VOP2 and hdmi Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 19/23] arm64: dts: rockchip: enable vop2 and hdmi tx on quartz64a Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 20/23] drm/rockchip: Make VOP driver optional Sascha Hauer
2022-03-29 11:56 ` Andy Yan
2022-03-30 6:39 ` Sascha Hauer
2022-03-30 12:50 ` Andy Yan
2022-03-31 7:06 ` Sascha Hauer
2022-03-31 7:20 ` Andy Yan
2022-03-31 8:18 ` Sascha Hauer
2022-03-31 11:00 ` Andy Yan
2022-04-01 12:55 ` Sascha Hauer
2022-04-02 1:25 ` Andy Yan
2022-04-05 9:05 ` Sascha Hauer
2022-04-06 1:43 ` Andy Yan
2022-04-06 7:04 ` Sascha Hauer
2022-04-06 7:47 ` Andy Yan
2022-04-06 8:00 ` Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 22/23] dt-bindings: display: rockchip: Add binding for VOP2 Sascha Hauer
2022-03-28 15:11 ` [PATCH v9 23/23] dt-bindings: display: rockchip: dw-hdmi: fix ports description Sascha Hauer
2022-03-29 7:31 ` [PATCH v9 00/23] drm/rockchip: RK356x VOP2 support Piotr Oniszczuk
2022-03-30 7:28 ` Sascha Hauer
2022-03-30 8:41 ` piotro.oniszczuk@google.com
2022-03-30 9:45 ` Sascha Hauer
2022-03-30 10:01 ` piotro.oniszczuk@google.com
2022-03-30 10:20 ` Sascha Hauer
2022-03-30 14:52 ` Piotr Oniszczuk
2022-03-30 19:20 ` Sascha Hauer
2022-03-30 19:35 ` Piotr Oniszczuk
2022-03-30 19:59 ` Sascha Hauer
2022-03-31 12:13 ` Andy Yan
2022-03-31 12:19 ` Sascha Hauer
2022-03-31 14:53 ` Piotr Oniszczuk
2022-03-31 15:00 ` Sascha Hauer
2022-03-31 15:06 ` Piotr Oniszczuk
2022-03-31 15:19 ` Piotr Oniszczuk
[not found] ` <622c8786-2c3f-13ff-66b7-ad9c8cb9425e@rock-chips.com>
2022-04-01 7:06 ` Sascha Hauer
[not found] ` <041d7795-fdec-8e7d-a9ee-aa79c0faa6f3@rock-chips.com>
2022-04-01 12:53 ` Piotr Oniszczuk
2022-04-01 12:52 ` Sascha Hauer
2022-04-01 13:05 ` Piotr Oniszczuk
2022-04-06 9:47 ` Piotr Oniszczuk
2022-04-06 14:58 ` Sascha Hauer
2022-04-06 16:00 ` Piotr Oniszczuk
2022-04-07 10:16 ` Sascha Hauer
2022-04-07 15:02 ` Piotr Oniszczuk
2022-04-08 8:07 ` Sascha Hauer
2022-04-08 12:00 ` Sascha Hauer
2022-04-08 15:54 ` Piotr Oniszczuk
2022-04-11 9:08 ` Sascha Hauer
2022-04-11 11:07 ` Piotr Oniszczuk
2022-04-12 7:50 ` Sascha Hauer
2022-04-12 8:10 ` Lucas Stach
2022-04-12 10:14 ` Piotr Oniszczuk
2022-04-12 11:30 ` Daniel Stone
2022-04-15 11:11 ` Piotr Oniszczuk
2022-04-25 14:54 ` Daniel Stone
2022-04-12 9:28 ` Piotr Oniszczuk
2022-04-02 1:37 ` Andy Yan
2022-04-05 9:37 ` Sascha Hauer
2022-04-06 2:02 ` Andy Yan
2022-04-06 8:13 ` Sascha Hauer
2022-04-06 8:36 ` Andy Yan
2022-04-06 14:54 ` Sascha Hauer
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