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Message-ID: <7eupqawhdrbjgsj2p7e3ky7uj62m252i6dzkb6y23btocedp3q@qmw72nmbk2c4>
Date: Fri, 10 Jan 2025 11:17:42 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Rob Clark <robdclark@...il.com>,
Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>,
Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>,
Simona Vetter <simona@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Krishna Manikandan <quic_mkrishn@...cinc.com>,
Jonathan Marek <jonathan@...ek.ca>, Kuogee Hsieh <quic_khsieh@...cinc.com>,
Neil Armstrong <neil.armstrong@...aro.org>, linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Srini Kandagatla <srinivas.kandagatla@...aro.org>
Subject: Re: [PATCH RFC 08/11] drm/msm/dsi: Add support for SM8750
On Fri, Jan 10, 2025 at 09:59:26AM +0100, Krzysztof Kozlowski wrote:
> On 10/01/2025 00:18, Dmitry Baryshkov wrote:
> > On Thu, Jan 09, 2025 at 02:08:35PM +0100, Krzysztof Kozlowski wrote:
> >> Add support for DSI PHY v7.0 on Qualcomm SM8750 SoC which comes with two
> >> differences worth noting:
> >>
> >> 1. ICODE_ACCUM_STATUS_LOW and ALOG_OBSV_BUS_STATUS_1 registers - their
> >> offsets were just switched. Currently these registers are not used
> >> in the driver, so the easiest is to document both but keep them
> >> commented out to avoid conflict.
> >>
> >> 2. DSI PHY PLLs, the parents of pixel and byte clocks, cannot be used as
> >> parents before they are prepared and initial rate is set. Therefore
> >> assigned-clock-parents are not working here and driver is responsible
> >> for reparenting clocks with proper procedure: see dsi_clk_init_6g_v2_9().
> >
> > Isn't it a description of CLK_SET_PARENT_GATE and/or
>
> No - must be gated accross reparent - so opposite.
>
> > CLK_OPS_PARENT_ENABLE ?
>
> Yes, but does not work. Probably enabling parent, before
> assigned-clocks-parents, happens still too early:
>
> [ 1.623554] DSI PLL(0) lock failed, status=0x00000000
> [ 1.623556] PLL(0) lock failed
> [ 1.624650] ------------[ cut here ]------------
> [ 1.624651] disp_cc_mdss_byte0_clk_src: rcg didn't update its
> configuration.
>
> Or maybe something is missing in the DSI PHY PLL driver?
Do you have the no-zero-freq workaround?
>
> >
> >>
> >> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> >> ---
> >> drivers/gpu/drm/msm/dsi/dsi.h | 2 +
> >> drivers/gpu/drm/msm/dsi/dsi_cfg.c | 25 +++++++
> >> drivers/gpu/drm/msm/dsi/dsi_cfg.h | 1 +
> >> drivers/gpu/drm/msm/dsi/dsi_host.c | 80 ++++++++++++++++++++++
> >> drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 2 +
> >> drivers/gpu/drm/msm/dsi/phy/dsi_phy.h | 1 +
> >> drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c | 78 +++++++++++++++++++--
> >> .../gpu/drm/msm/registers/display/dsi_phy_7nm.xml | 14 ++++
> >
> > Please separate DSI and PHY changes.
> >
> >> 8 files changed, 197 insertions(+), 6 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/msm/dsi/dsi_cfg.c b/drivers/gpu/drm/msm/dsi/dsi_cfg.c
> >> index 7754dcec33d06e3d6eb8a9d55e53f24af073adb9..e2a8d6fcc45b6c207a3018ea7c8744fcf34dabd2 100644
> >> --- a/drivers/gpu/drm/msm/dsi/dsi_cfg.c
> >> +++ b/drivers/gpu/drm/msm/dsi/dsi_cfg.c
> >> @@ -205,6 +205,17 @@ static const struct msm_dsi_config sm8650_dsi_cfg = {
> >> },
> >> };
> >>
> >> +static const struct msm_dsi_config sm8750_dsi_cfg = {
> >> + .io_offset = DSI_6G_REG_SHIFT,
> >> + .regulator_data = sm8650_dsi_regulators,
> >> + .num_regulators = ARRAY_SIZE(sm8650_dsi_regulators),
> >> + .bus_clk_names = dsi_v2_4_clk_names,
> >> + .num_bus_clks = ARRAY_SIZE(dsi_v2_4_clk_names),
> >> + .io_start = {
> >> + { 0xae94000, 0xae96000 },
> >> + },
> >> +};
> >> +
> >> static const struct regulator_bulk_data sc7280_dsi_regulators[] = {
> >> { .supply = "vdda", .init_load_uA = 8350 }, /* 1.2 V */
> >> { .supply = "refgen" },
> >> @@ -257,6 +268,18 @@ static const struct msm_dsi_host_cfg_ops msm_dsi_6g_v2_host_ops = {
> >> .calc_clk_rate = dsi_calc_clk_rate_6g,
> >> };
> >>
> >> +static const struct msm_dsi_host_cfg_ops msm_dsi_6g_v2_9_host_ops = {
> >> + .link_clk_set_rate = dsi_link_clk_set_rate_6g_v2_9,
> >> + .link_clk_enable = dsi_link_clk_enable_6g,
> >> + .link_clk_disable = dsi_link_clk_disable_6g,
> >> + .clk_init_ver = dsi_clk_init_6g_v2_9,
> >> + .tx_buf_alloc = dsi_tx_buf_alloc_6g,
> >> + .tx_buf_get = dsi_tx_buf_get_6g,
> >> + .tx_buf_put = dsi_tx_buf_put_6g,
> >> + .dma_base_get = dsi_dma_base_get_6g,
> >> + .calc_clk_rate = dsi_calc_clk_rate_6g,
> >> +};
> >> +
> >> static const struct msm_dsi_cfg_handler dsi_cfg_handlers[] = {
> >> {MSM_DSI_VER_MAJOR_V2, MSM_DSI_V2_VER_MINOR_8064,
> >> &apq8064_dsi_cfg, &msm_dsi_v2_host_ops},
> >> @@ -300,6 +323,8 @@ static const struct msm_dsi_cfg_handler dsi_cfg_handlers[] = {
> >> &sm8550_dsi_cfg, &msm_dsi_6g_v2_host_ops},
> >> {MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V2_8_0,
> >> &sm8650_dsi_cfg, &msm_dsi_6g_v2_host_ops},
> >> + {MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V2_9_0,
> >> + &sm8750_dsi_cfg, &msm_dsi_6g_v2_9_host_ops},
> >> };
> >>
> >> const struct msm_dsi_cfg_handler *msm_dsi_cfg_get(u32 major, u32 minor)
> >> diff --git a/drivers/gpu/drm/msm/dsi/dsi_cfg.h b/drivers/gpu/drm/msm/dsi/dsi_cfg.h
> >> index 120cb65164c1ba1deb9acb513e5f073bd560c496..859c279afbb0377d16f8406f3e6b083640aff5a1 100644
> >> --- a/drivers/gpu/drm/msm/dsi/dsi_cfg.h
> >> +++ b/drivers/gpu/drm/msm/dsi/dsi_cfg.h
> >> @@ -30,6 +30,7 @@
> >> #define MSM_DSI_6G_VER_MINOR_V2_6_0 0x20060000
> >> #define MSM_DSI_6G_VER_MINOR_V2_7_0 0x20070000
> >> #define MSM_DSI_6G_VER_MINOR_V2_8_0 0x20080000
> >> +#define MSM_DSI_6G_VER_MINOR_V2_9_0 0x20090000
> >>
> >> #define MSM_DSI_V2_VER_MINOR_8064 0x0
> >>
> >> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> >> index 2218d4f0c5130a0b13f428e89aa30ba2921da572..ced28ee61eedc0a82da9f1d0792f17ee2a5538c4 100644
> >> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> >> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> >> @@ -119,6 +119,15 @@ struct msm_dsi_host {
> >> struct clk *pixel_clk;
> >> struct clk *byte_intf_clk;
> >>
> >> + /*
> >> + * Clocks which needs to be properly parented between DISPCC and DSI PHY
> >> + * PLL:
> >> + */
> >> + struct clk *byte_src_clk;
> >> + struct clk *pixel_src_clk;
> >> + struct clk *dsi_pll_byte_clk;
> >> + struct clk *dsi_pll_pixel_clk;
> >> +
> >> unsigned long byte_clk_rate;
> >> unsigned long byte_intf_clk_rate;
> >> unsigned long pixel_clk_rate;
> >> @@ -269,6 +278,38 @@ int dsi_clk_init_6g_v2(struct msm_dsi_host *msm_host)
> >> return ret;
> >> }
> >>
> >> +int dsi_clk_init_6g_v2_9(struct msm_dsi_host *msm_host)
> >> +{
> >> + struct device *dev = &msm_host->pdev->dev;
> >> + int ret;
> >> +
> >> + ret = dsi_clk_init_6g_v2(msm_host);
> >> + if (ret)
> >> + return ret;
> >> +
> >> + msm_host->byte_src_clk = devm_clk_get(dev, "byte_src");
> >> + if (IS_ERR(msm_host->byte_src_clk))
> >> + return dev_err_probe(dev, PTR_ERR(msm_host->byte_src_clk),
> >> + "can't get byte_src clock\n");
> >> +
> >> + msm_host->dsi_pll_byte_clk = devm_clk_get(dev, "dsi_pll_byte");
> >> + if (IS_ERR(msm_host->dsi_pll_byte_clk))
> >> + return dev_err_probe(dev, PTR_ERR(msm_host->dsi_pll_byte_clk),
> >> + "can't get dsi_pll_byte clock\n");
> >> +
> >> + msm_host->pixel_src_clk = devm_clk_get(dev, "pixel_src");
> >> + if (IS_ERR(msm_host->pixel_src_clk))
> >> + return dev_err_probe(dev, PTR_ERR(msm_host->pixel_src_clk),
> >> + "can't get pixel_src clock\n");
> >> +
> >> + msm_host->dsi_pll_pixel_clk = devm_clk_get(dev, "dsi_pll_pixel");
> >> + if (IS_ERR(msm_host->dsi_pll_pixel_clk))
> >> + return dev_err_probe(dev, PTR_ERR(msm_host->dsi_pll_pixel_clk),
> >> + "can't get dsi_pll_pixel clock\n");
> >
> > How is this going to work in the bonded DSI mode when DSI1 is being fed
> > by the DSI0 PLL? For existing platforms this is being handled by
> > changing the parents in DT.
>
> I don't see the problem - you just put different clock as input in DTS?
>
> Please trim your replies, so we won't need to keep scrolling to figure
> out that there is nothing more to read.
>
> Best regards,
> Krzysztof
--
With best wishes
Dmitry
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