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Date: Sun, 29 Aug 2021 23:39:19 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Marijn Suijten <marijn.suijten@...ainline.org>
Cc: phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...ainline.org>,
Konrad Dybcio <konrad.dybcio@...ainline.org>,
Martin Botka <martin.botka@...ainline.org>,
Jami Kettunen <jami.kettunen@...ainline.org>,
Pavel Dubrova <pashadubrova@...il.com>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Abhinav Kumar <abhinavk@...eaurora.org>,
Jonathan Marek <jonathan@...ek.ca>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<linux-arm-msm@...r.kernel.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<dri-devel@...ts.freedesktop.org>,
freedreno <freedreno@...ts.freedesktop.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] drm/msm/dsi: Use "ref" fw clock instead of global
name for VCO parent
Hi,
On Sun, 29 Aug 2021 at 23:30, Marijn Suijten
<marijn.suijten@...ainline.org> wrote:
>
> All DSI PHY/PLL drivers were referencing their VCO parent clock by a
> global name, most of which don't exist or have been renamed. These
> clock drivers seem to function fine without that except the 14nm driver
> for the sdm6xx [1].
>
> At the same time all DTs provide a "ref" clock as per the requirements
> of dsi-phy-common.yaml, but the clock is never used. This patchset puts
> that clock to use without relying on a global clock name, so that all
> dependencies are explicitly defined in DT (the firmware) in the end.
msm8974 (28nm-hpm) does not define the "ref" clock. So you'd have to:
1) add ref clock to the dtsi (should come in a separate patch).
2) add .name = "xo" as a fallback to the 28nm driver (to be compatible
with older devices)
Other than that this looks good to me.
>
> [1]: https://lore.kernel.org/linux-arm-msm/386db1a6-a1cd-3c7d-a88e-dc83f8a1be96@somainline.org/
>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> ---
> drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c | 4 +++-
> drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c | 4 +++-
> drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c | 4 +++-
> drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c | 4 +++-
> drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c | 4 +++-
> 5 files changed, 15 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c
> index e46b10fc793a..3cbb1f1475e8 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c
> @@ -562,7 +562,9 @@ static int pll_10nm_register(struct dsi_pll_10nm *pll_10nm, struct clk_hw **prov
> char clk_name[32], parent[32], vco_name[32];
> char parent2[32], parent3[32], parent4[32];
> struct clk_init_data vco_init = {
> - .parent_names = (const char *[]){ "xo" },
> + .parent_data = &(const struct clk_parent_data) {
> + .fw_name = "ref",
> + },
> .num_parents = 1,
> .name = vco_name,
> .flags = CLK_IGNORE_UNUSED,
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c
> index bb31230721bd..406470265408 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c
> @@ -804,7 +804,9 @@ static int pll_14nm_register(struct dsi_pll_14nm *pll_14nm, struct clk_hw **prov
> {
> char clk_name[32], parent[32], vco_name[32];
> struct clk_init_data vco_init = {
> - .parent_names = (const char *[]){ "xo" },
> + .parent_data = &(const struct clk_parent_data) {
> + .fw_name = "ref",
> + },
> .num_parents = 1,
> .name = vco_name,
> .flags = CLK_IGNORE_UNUSED,
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c
> index 2da673a2add6..8ee9c9c0548d 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c
> @@ -521,7 +521,9 @@ static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm, struct clk_hw **prov
> {
> char clk_name[32], parent1[32], parent2[32], vco_name[32];
> struct clk_init_data vco_init = {
> - .parent_names = (const char *[]){ "xo" },
> + .parent_data = &(const struct clk_parent_data) {
> + .fw_name = "ref",
> + },
> .num_parents = 1,
> .name = vco_name,
> .flags = CLK_IGNORE_UNUSED,
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c
> index aaa37456f4ee..9662cb236468 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c
> @@ -385,7 +385,9 @@ static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm, struct clk_hw **prov
> {
> char *clk_name, *parent_name, *vco_name;
> struct clk_init_data vco_init = {
> - .parent_names = (const char *[]){ "pxo" },
> + .parent_data = &(const struct clk_parent_data) {
> + .fw_name = "ref",
> + },
> .num_parents = 1,
> .flags = CLK_IGNORE_UNUSED,
> .ops = &clk_ops_dsi_pll_28nm_vco,
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> index 7c23d4c47338..c77c30628cca 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> @@ -590,7 +590,9 @@ static int pll_7nm_register(struct dsi_pll_7nm *pll_7nm, struct clk_hw **provide
> char clk_name[32], parent[32], vco_name[32];
> char parent2[32], parent3[32], parent4[32];
> struct clk_init_data vco_init = {
> - .parent_names = (const char *[]){ "bi_tcxo" },
> + .parent_data = &(const struct clk_parent_data) {
> + .fw_name = "ref",
> + },
> .num_parents = 1,
> .name = vco_name,
> .flags = CLK_IGNORE_UNUSED,
> --
> 2.33.0
>
--
With best wishes
Dmitry
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