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Message-ID: <xeemxeld4cqpx47kzb5qqsawk7mu5kje6r7n335dhe2s7ynw6m@eaiowriiilgr>
Date: Sat, 19 Oct 2024 17:06:45 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: shiyongbang <shiyongbang@...wei.com>
Cc: xinliang.liu@...aro.org, tiantao6@...ilicon.com,
maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com,
daniel@...ll.ch, kong.kongxinwei@...ilicon.com, liangjian010@...wei.com,
chenjianmin@...wei.com, lidongming5@...wei.com, libaihan@...wei.com,
shenjian15@...wei.com, shaojijie@...wei.com, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH drm-dp 4/4] drm/hisilicon/hibmc: add dp module in hibmc
On Mon, Sep 30, 2024 at 06:06:10PM +0800, shiyongbang wrote:
> From: baihan li <libaihan@...wei.com>
>
> To support DP interface displaying in hibmc driver. Add
> a encoder and connector for DP modual.
>
> Signed-off-by: baihan li <libaihan@...wei.com>
> ---
> drivers/gpu/drm/hisilicon/hibmc/Makefile | 2 +-
> .../gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c | 195 ++++++++++++++++++
> .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 17 +-
> .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h | 5 +
> 4 files changed, 217 insertions(+), 2 deletions(-)
> create mode 100644 drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
>
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/Makefile b/drivers/gpu/drm/hisilicon/hibmc/Makefile
> index 693036dfab52..8cf74e0d4785 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/Makefile
> +++ b/drivers/gpu/drm/hisilicon/hibmc/Makefile
> @@ -1,5 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0-only
> hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_vdac.o hibmc_drm_i2c.o \
> - dp/dp_aux.o dp/dp_link.o dp/dp_kapi.o
> + dp/dp_aux.o dp/dp_link.o dp/dp_kapi.o hibmc_drm_dp.o
>
> obj-$(CONFIG_DRM_HISI_HIBMC) += hibmc-drm.o
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
> new file mode 100644
> index 000000000000..7a50f1d81aac
> --- /dev/null
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
> @@ -0,0 +1,195 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +
> +#include <linux/io.h>
> +
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_simple_kms_helper.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_edid.h>
> +
> +#include "hibmc_drm_drv.h"
> +#include "dp/dp_kapi.h"
> +
> +static int hibmc_dp_connector_get_modes(struct drm_connector *connector)
> +{
> + int count;
> +
> + count = drm_add_modes_noedid(connector, connector->dev->mode_config.max_width,
> + connector->dev->mode_config.max_height);
> + drm_set_preferred_mode(connector, 800, 600); /* default 800x600 */
What? Please parse EDID instead.
> +
> + return count;
> +}
> +
> +static const struct drm_connector_helper_funcs hibmc_dp_conn_helper_funcs = {
> + .get_modes = hibmc_dp_connector_get_modes,
> +};
> +
> +static const struct drm_connector_funcs hibmc_dp_conn_funcs = {
> + .reset = drm_atomic_helper_connector_reset,
> + .fill_modes = drm_helper_probe_single_connector_modes,
> + .destroy = drm_connector_cleanup,
> + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static void dp_mode_cfg(struct drm_device *dev, struct dp_mode *dp_mode,
> + struct drm_display_mode *mode)
> +{
> + dp_mode->field_rate = drm_mode_vrefresh(mode);
> + dp_mode->pixel_clock = mode->clock / 1000; /* 1000: khz to hz */
> +
> + dp_mode->h_total = mode->htotal;
> + dp_mode->h_active = mode->hdisplay;
> + dp_mode->h_blank = mode->htotal - mode->hdisplay;
> + dp_mode->h_front = mode->hsync_start - mode->hdisplay;
> + dp_mode->h_sync = mode->hsync_end - mode->hsync_start;
> + dp_mode->h_back = mode->htotal - mode->hsync_end;
> +
> + dp_mode->v_total = mode->vtotal;
> + dp_mode->v_active = mode->vdisplay;
> + dp_mode->v_blank = mode->vtotal - mode->vdisplay;
> + dp_mode->v_front = mode->vsync_start - mode->vdisplay;
> + dp_mode->v_sync = mode->vsync_end - mode->vsync_start;
> + dp_mode->v_back = mode->vtotal - mode->vsync_end;
No need to copy the bits around. Please use drm_display_mode directly.
> +
> + if (mode->flags & DRM_MODE_FLAG_PHSYNC) {
> + drm_info(dev, "horizontal sync polarity: positive\n");
> + dp_mode->h_pol = 1;
> + } else if (mode->flags & DRM_MODE_FLAG_NHSYNC) {
> + drm_info(dev, "horizontal sync polarity: negative\n");
> + dp_mode->h_pol = 0;
> + } else {
> + drm_err(dev, "horizontal sync polarity: unknown or not set\n");
> + }
> +
> + if (mode->flags & DRM_MODE_FLAG_PVSYNC) {
> + drm_info(dev, "vertical sync polarity: positive\n");
> + dp_mode->v_pol = 1;
> + } else if (mode->flags & DRM_MODE_FLAG_NVSYNC) {
> + drm_info(dev, "vertical sync polarity: negative\n");
No spamming, use DRM debugging macros.
> + dp_mode->v_pol = 0;
> + } else {
> + drm_err(dev, "vertical sync polarity: unknown or not set\n");
> + }
> +}
> +
> +static int dp_prepare(struct hibmc_dp *dp, struct drm_display_mode *mode)
> +{
> + struct dp_mode dp_mode = {0};
> + int ret;
> +
> + hibmc_dp_display_en(dp, false);
> +
> + dp_mode_cfg(dp->drm_dev, &dp_mode, mode);
> + ret = hibmc_dp_mode_set(dp, &dp_mode);
> + if (ret)
> + drm_err(dp->drm_dev, "hibmc dp mode set failed: %d\n", ret);
> +
> + return ret;
> +}
> +
> +static void dp_enable(struct hibmc_dp *dp)
> +{
> + hibmc_dp_display_en(dp, true);
> +}
> +
> +static void dp_disable(struct hibmc_dp *dp)
> +{
> + hibmc_dp_display_en(dp, false);
> +}
> +
> +static int hibmc_dp_hw_init(struct hibmc_drm_private *priv)
> +{
> + int ret;
> +
> + ret = hibmc_dp_kapi_init(&priv->dp);
> + if (ret)
> + return ret;
> +
> + hibmc_dp_display_en(&priv->dp, false);
> +
> + return 0;
> +}
> +
> +static void hibmc_dp_hw_uninit(struct hibmc_drm_private *priv)
> +{
> + hibmc_dp_kapi_uninit(&priv->dp);
> +}
Inline all these one-line wrappers, they serve no purpose.
> +
> +static void hibmc_dp_encoder_enable(struct drm_encoder *drm_encoder,
> + struct drm_atomic_state *state)
> +{
> + struct hibmc_dp *dp = container_of(drm_encoder, struct hibmc_dp, encoder);
> + struct drm_display_mode *mode = &drm_encoder->crtc->state->mode;
> +
> + if (dp_prepare(dp, mode))
> + return;
> +
> + dp_enable(dp);
> +}
> +
> +static void hibmc_dp_encoder_disable(struct drm_encoder *drm_encoder,
> + struct drm_atomic_state *state)
> +{
> + struct hibmc_dp *dp = container_of(drm_encoder, struct hibmc_dp, encoder);
> +
> + dp_disable(dp);
> +}
> +
> +static const struct drm_encoder_helper_funcs hibmc_dp_encoder_helper_funcs = {
> + .atomic_enable = hibmc_dp_encoder_enable,
> + .atomic_disable = hibmc_dp_encoder_disable,
> +};
> +
> +void hibmc_dp_uninit(struct hibmc_drm_private *priv)
> +{
> + hibmc_dp_hw_uninit(priv);
> +}
> +
> +int hibmc_dp_init(struct hibmc_drm_private *priv)
> +{
> + struct drm_device *dev = &priv->dev;
> + struct drm_crtc *crtc = &priv->crtc;
> + struct hibmc_dp *dp = &priv->dp;
> + struct drm_connector *connector = &dp->connector;
> + struct drm_encoder *encoder = &dp->encoder;
> + int ret;
> +
> + dp->mmio = priv->mmio;
> + dp->drm_dev = dev;
> +
> + ret = hibmc_dp_hw_init(priv);
> + if (ret) {
> + drm_err(dev, "dp hw init failed: %d\n", ret);
> + return ret;
> + }
> +
> + encoder->possible_crtcs = drm_crtc_mask(crtc);
> + ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);
I think drm_simple_foo interfaces are being deprecated. Please copy
required code into the driver instead.
> + if (ret) {
> + drm_err(dev, "init dp encoder failed: %d\n", ret);
> + goto err_init;
> + }
> +
> + drm_encoder_helper_add(encoder, &hibmc_dp_encoder_helper_funcs);
> +
> + ret = drm_connector_init(dev, connector, &hibmc_dp_conn_funcs,
> + DRM_MODE_CONNECTOR_DisplayPort);
> + if (ret) {
> + drm_err(dev, "init dp connector failed: %d\n", ret);
> + goto err_init;
> + }
> +
> + drm_connector_helper_add(connector, &hibmc_dp_conn_helper_funcs);
> +
> + drm_connector_attach_encoder(connector, encoder);
> +
> + return 0;
> +
> +err_init:
> + hibmc_dp_hw_uninit(priv);
> +
> + return ret;
> +}
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> index 9f9b19ea0587..c90a8db021b0 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> @@ -93,6 +93,10 @@ static const struct drm_mode_config_funcs hibmc_mode_funcs = {
>
> static int hibmc_kms_init(struct hibmc_drm_private *priv)
> {
> +#define DP_HOST_SERDES_CTRL 0x1f001c
> +#define DP_HOST_SERDES_CTRL_VAL 0x8A00
> +#define DP_HOST_SERDES_CTRL_MASK 0x7FFFE
> +
#defines outside of the function body.
> struct drm_device *dev = &priv->dev;
> int ret;
>
> @@ -116,10 +120,17 @@ static int hibmc_kms_init(struct hibmc_drm_private *priv)
> return ret;
> }
>
> + /* if DP existed, init DP */
> + if ((readl(priv->mmio + DP_HOST_SERDES_CTRL) &
> + DP_HOST_SERDES_CTRL_MASK) == DP_HOST_SERDES_CTRL_VAL) {
> + ret = hibmc_dp_init(priv);
> + if (ret)
> + drm_err(dev, "failed to init dp: %d\n", ret);
> + }
> +
> ret = hibmc_vdac_init(priv);
> if (ret) {
> drm_err(dev, "failed to init vdac: %d\n", ret);
> - return ret;
Why?
> }
>
> return 0;
> @@ -239,6 +250,7 @@ static int hibmc_hw_init(struct hibmc_drm_private *priv)
>
> static int hibmc_unload(struct drm_device *dev)
> {
> + struct hibmc_drm_private *priv = to_hibmc_drm_private(dev);
> struct pci_dev *pdev = to_pci_dev(dev->dev);
>
> drm_atomic_helper_shutdown(dev);
> @@ -247,6 +259,9 @@ static int hibmc_unload(struct drm_device *dev)
>
> pci_disable_msi(to_pci_dev(dev->dev));
>
> + if (priv->dp.encoder.possible_crtcs)
> + hibmc_dp_uninit(priv);
> +
> return 0;
> }
>
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
> index 6b566f3aeecb..aa79903fe022 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
> @@ -19,6 +19,7 @@
> #include <linux/i2c.h>
>
> #include <drm/drm_framebuffer.h>
> +#include "dp/dp_kapi.h"
>
> struct hibmc_connector {
> struct drm_connector base;
> @@ -37,6 +38,7 @@ struct hibmc_drm_private {
> struct drm_crtc crtc;
> struct drm_encoder encoder;
> struct hibmc_connector connector;
It seems this needs to be refactored too, to separate VGA connector /
encoder / CRTC to a child struct.
> + struct hibmc_dp dp;
> };
>
> static inline struct hibmc_connector *to_hibmc_connector(struct drm_connector *connector)
> @@ -59,4 +61,7 @@ int hibmc_vdac_init(struct hibmc_drm_private *priv);
>
> int hibmc_ddc_create(struct drm_device *drm_dev, struct hibmc_connector *connector);
>
> +int hibmc_dp_init(struct hibmc_drm_private *priv);
> +void hibmc_dp_uninit(struct hibmc_drm_private *priv);
> +
> #endif
> --
> 2.33.0
>
--
With best wishes
Dmitry
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