linux-kernel - Re: [PATCH 1/4] clk: qcom: dispcc-sm8450: fix DisplayPort clocks

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Date: Wed, 10 Apr 2024 20:11:44 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: neil.armstrong@...aro.org
Cc: Bjorn Andersson <andersson@...nel.org>, Michael Turquette <mturquette@...libre.com>, 
	Stephen Boyd <sboyd@...nel.org>, Konrad Dybcio <konrad.dybcio@...ainline.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, linux-arm-msm@...r.kernel.org, 
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] clk: qcom: dispcc-sm8450: fix DisplayPort clocks

On Wed, 10 Apr 2024 at 19:27, Neil Armstrong <neil.armstrong@...aro.org> wrote:
>
> On 08/04/2024 13:47, Dmitry Baryshkov wrote:
> > On SM8450 DisplayPort link clocks use frequency tables inherited from
> > the vendor kernel, it is not applicable in the upstream kernel. Drop
> > frequency tables and use clk_byte2_ops for those clocks.
> >
> > Fixes: 16fb89f92ec4 ("clk: qcom: Add support for Display Clock Controller on SM8450")
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > ---
> >   drivers/clk/qcom/dispcc-sm8450.c | 20 ++++----------------
> >   1 file changed, 4 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/clk/qcom/dispcc-sm8450.c b/drivers/clk/qcom/dispcc-sm8450.c
> > index 92e9c4e7b13d..49bb4f58c391 100644
> > --- a/drivers/clk/qcom/dispcc-sm8450.c
> > +++ b/drivers/clk/qcom/dispcc-sm8450.c
> > @@ -309,26 +309,17 @@ static struct clk_rcg2 disp_cc_mdss_dptx0_aux_clk_src = {
> >       },
> >   };
> >
> > -static const struct freq_tbl ftbl_disp_cc_mdss_dptx0_link_clk_src[] = {
> > -     F(162000, P_DP0_PHY_PLL_LINK_CLK, 1, 0, 0),
> > -     F(270000, P_DP0_PHY_PLL_LINK_CLK, 1, 0, 0),
> > -     F(540000, P_DP0_PHY_PLL_LINK_CLK, 1, 0, 0),
> > -     F(810000, P_DP0_PHY_PLL_LINK_CLK, 1, 0, 0),
> > -     { }
> > -};
> > -
> >   static struct clk_rcg2 disp_cc_mdss_dptx0_link_clk_src = {
> >       .cmd_rcgr = 0x819c,
> >       .mnd_width = 0,
> >       .hid_width = 5,
> >       .parent_map = disp_cc_parent_map_3,
> > -     .freq_tbl = ftbl_disp_cc_mdss_dptx0_link_clk_src,
> >       .clkr.hw.init = &(struct clk_init_data) {
> >               .name = "disp_cc_mdss_dptx0_link_clk_src",
> >               .parent_data = disp_cc_parent_data_3,
> >               .num_parents = ARRAY_SIZE(disp_cc_parent_data_3),
> >               .flags = CLK_SET_RATE_PARENT,
> > -             .ops = &clk_rcg2_ops,
> > +             .ops = &clk_byte2_ops,
> >       },
> >   };
> >
> > @@ -382,13 +373,12 @@ static struct clk_rcg2 disp_cc_mdss_dptx1_link_clk_src = {
> >       .mnd_width = 0,
> >       .hid_width = 5,
> >       .parent_map = disp_cc_parent_map_3,
> > -     .freq_tbl = ftbl_disp_cc_mdss_dptx0_link_clk_src,
> >       .clkr.hw.init = &(struct clk_init_data) {
> >               .name = "disp_cc_mdss_dptx1_link_clk_src",
> >               .parent_data = disp_cc_parent_data_3,
> >               .num_parents = ARRAY_SIZE(disp_cc_parent_data_3),
> >               .flags = CLK_SET_RATE_PARENT,
> > -             .ops = &clk_rcg2_ops,
> > +             .ops = &clk_byte2_ops,
> >       },
> >   };
> >
> > @@ -442,13 +432,12 @@ static struct clk_rcg2 disp_cc_mdss_dptx2_link_clk_src = {
> >       .mnd_width = 0,
> >       .hid_width = 5,
> >       .parent_map = disp_cc_parent_map_3,
> > -     .freq_tbl = ftbl_disp_cc_mdss_dptx0_link_clk_src,
> >       .clkr.hw.init = &(struct clk_init_data) {
> >               .name = "disp_cc_mdss_dptx2_link_clk_src",
> >               .parent_data = disp_cc_parent_data_3,
> >               .num_parents = ARRAY_SIZE(disp_cc_parent_data_3),
> >               .flags = CLK_SET_RATE_PARENT,
> > -             .ops = &clk_rcg2_ops,
> > +             .ops = &clk_byte2_ops,
> >       },
> >   };
> >
> > @@ -502,13 +491,12 @@ static struct clk_rcg2 disp_cc_mdss_dptx3_link_clk_src = {
> >       .mnd_width = 0,
> >       .hid_width = 5,
> >       .parent_map = disp_cc_parent_map_3,
> > -     .freq_tbl = ftbl_disp_cc_mdss_dptx0_link_clk_src,
> >       .clkr.hw.init = &(struct clk_init_data) {
> >               .name = "disp_cc_mdss_dptx3_link_clk_src",
> >               .parent_data = disp_cc_parent_data_3,
> >               .num_parents = ARRAY_SIZE(disp_cc_parent_data_3),
> >               .flags = CLK_SET_RATE_PARENT,
> > -             .ops = &clk_rcg2_ops,
> > +             .ops = &clk_byte2_ops,
> >       },
> >   };
> >
> >
>
>
> Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
>
> I can't test, but I assume you tested on your HDK8450

That's how I stumbled upon it. I was not able to test other patches in
the series, but granted the similarity I assume that they should work
in the same way.

-- 
With best wishes
Dmitry