Patch "clk: imx6: refine hdmi_isfr's parent to make HDMI work on i.MX6 SoCs w/o VPU" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    clk: imx6: refine hdmi_isfr's parent to make HDMI work on i.MX6 SoCs w/o VPU

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     clk-imx6-refine-hdmi_isfr-s-parent-to-make-hdmi-work-on-i.mx6-socs-w-o-vpu.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Dec 18 14:47:43 CET 2017
From: S�bastien Szymanski <sebastien.szymanski@armadeus.com>
Date: Tue, 1 Aug 2017 12:40:07 +0200
Subject: clk: imx6: refine hdmi_isfr's parent to make HDMI work on i.MX6 SoCs w/o VPU

From: S�bastien Szymanski <sebastien.szymanski@armadeus.com>


[ Upstream commit c68ee58d9ee7b856ac722f18f4f26579c8fbd2b4 ]

On i.MX6 SoCs without VPU (in my case MCIMX6D4AVT10AC), the hdmi driver
fails to probe:

[    2.540030] dwhdmi-imx 120000.hdmi: Unsupported HDMI controller
(0000:00:00)
[    2.548199] imx-drm display-subsystem: failed to bind 120000.hdmi
(ops dw_hdmi_imx_ops): -19
[    2.557403] imx-drm display-subsystem: master bind failed: -19

That's because hdmi_isfr's parent, video_27m, is not correctly ungated.
As explained in commit 5ccc248cc537 ("ARM: imx6q: clk: Add support for
mipi_core_cfg clock as a shared clock gate"), video_27m is gated by
CCM_CCGR3[CG8].

On i.MX6 SoCs with VPU, the hdmi is working thanks to the
CCM_CMEOR[mod_en_ov_vpu] bit which makes the video_27m ungated whatever
is in CCM_CCGR3[CG8]. The issue can be reproduced by setting
CCMEOR[mod_en_ov_vpu] to 0.

Make the HDMI work in every case by setting hdmi_isfr's parent to
mipi_core_cfg.

Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/clk/imx/clk-imx6q.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/clk/imx/clk-imx6q.c
+++ b/drivers/clk/imx/clk-imx6q.c
@@ -419,7 +419,7 @@ static void __init imx6q_clocks_init(str
 		clk[IMX6QDL_CLK_GPU2D_CORE] = imx_clk_gate2("gpu2d_core", "gpu2d_core_podf", base + 0x6c, 24);
 	clk[IMX6QDL_CLK_GPU3D_CORE]   = imx_clk_gate2("gpu3d_core",    "gpu3d_core_podf",   base + 0x6c, 26);
 	clk[IMX6QDL_CLK_HDMI_IAHB]    = imx_clk_gate2("hdmi_iahb",     "ahb",               base + 0x70, 0);
-	clk[IMX6QDL_CLK_HDMI_ISFR]    = imx_clk_gate2("hdmi_isfr",     "video_27m",         base + 0x70, 4);
+	clk[IMX6QDL_CLK_HDMI_ISFR]    = imx_clk_gate2("hdmi_isfr",     "mipi_core_cfg",     base + 0x70, 4);
 	clk[IMX6QDL_CLK_I2C1]         = imx_clk_gate2("i2c1",          "ipg_per",           base + 0x70, 6);
 	clk[IMX6QDL_CLK_I2C2]         = imx_clk_gate2("i2c2",          "ipg_per",           base + 0x70, 8);
 	clk[IMX6QDL_CLK_I2C3]         = imx_clk_gate2("i2c3",          "ipg_per",           base + 0x70, 10);


Patches currently in stable-queue which might be from sebastien.szymanski@armadeus.com are

queue-4.4/clk-imx6-refine-hdmi_isfr-s-parent-to-make-hdmi-work-on-i.mx6-socs-w-o-vpu.patch