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Message-ID: <30c24ff7965657844078461a8d0ba997.squirrel@www.codeaurora.org>
Date: Tue, 24 Mar 2015 16:13:54 -0000
From: jilaiw@...eaurora.org
To: "Rob Clark" <robdclark@...il.com>
Cc: "Jilai Wang" <jilaiw@...eaurora.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"linux-arm-msm" <linux-arm-msm@...r.kernel.org>,
"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm: Refactor msm drm driver by introducing
msm_drm_sub_dev
> On Tue, Mar 24, 2015 at 11:18 AM, <jilaiw@...eaurora.org> wrote:
>>
>>> On Thu, Mar 12, 2015 at 4:48 PM, Jilai Wang <jilaiw@...eaurora.org>
>>> wrote:
>>>> Introduce msm_drm_sub_dev for each mdp interface component such as
>>>> HDMI/eDP/DSI to contain common information shared with MDP.
>>>>
>>>> Signed-off-by: Jilai Wang <jilaiw@...eaurora.org>
>>>> ---
>>>> drivers/gpu/drm/msm/edp/edp.c | 18 +++++++++--
>>>> drivers/gpu/drm/msm/edp/edp.h | 1 +
>>>> drivers/gpu/drm/msm/hdmi/hdmi.c | 22 ++++++++++---
>>>> drivers/gpu/drm/msm/hdmi/hdmi.h | 1 +
>>>> drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c | 3 +-
>>>> drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c | 56
>>>> ++++++++++++++++-----------------
>>>> drivers/gpu/drm/msm/msm_drv.h | 23 +++++++++-----
>>>> 7 files changed, 80 insertions(+), 44 deletions(-)
>>>
>>> So a couple comments..
>>>
>>> 1) I kinda prefer having some to_hdmi/to_edp/etc macros rather than
>>> just open coding container_of().. I guess kind of a minor thing, but
>>> it keeps things consistent with how "inheritance" is handled elsewhere
>>> (like to_mdp5_crtc(), etc)
>>>
>>> 2) I'd be a bit more enthused by this when it actually results in a
>>> negative diffstat, rather than a positive one. Not saying it isn't
>>> something we should do at some point, but at this point I'm leaning
>>> towards rebasing the DSI patcheset to not depend on this for now.
>> Actually most of the negative diffstat is in mdp5_kms.c which moves the
>> modeset_init out of construct encoder. And it is required by DSI change.
>
>
> What I meant is that it adds more lines of code than it removes.. for
> refactoring/cleanup type things, I'd generally prefer things that work
> out the other way around (removing more lines than they add)..
> Anyways, if I drop this patch, I'll rebase the DSI patches.. that is
> fine.
>
> By the time I get DSI also working on mdp4, it might get to the point
> where this sort of change actually removes more lines than it adds, so
> that might be the time to revisit. We may also be able to simplify it
> a bit.. I'm still thinking about it, I haven't completely decided
> yet.
ok.
>
> BR,
> -R
>
>
>>>
>>> BR,
>>> -R
>>>
>>>>
>>>> diff --git a/drivers/gpu/drm/msm/edp/edp.c
>>>> b/drivers/gpu/drm/msm/edp/edp.c
>>>> index 0940e84..8d8b7e9 100644
>>>> --- a/drivers/gpu/drm/msm/edp/edp.c
>>>> +++ b/drivers/gpu/drm/msm/edp/edp.c
>>>> @@ -14,6 +14,9 @@
>>>> #include <linux/of_irq.h>
>>>> #include "edp.h"
>>>>
>>>> +static int msm_edp_modeset_init(struct msm_drm_sub_dev *base,
>>>> + struct drm_device *dev);
>>>> +
>>>> static irqreturn_t edp_irq(int irq, void *dev_id)
>>>> {
>>>> struct msm_edp *edp = dev_id;
>>>> @@ -63,6 +66,8 @@ static struct msm_edp *edp_init(struct
>>>> platform_device
>>>> *pdev)
>>>> if (ret)
>>>> goto fail;
>>>>
>>>> + edp->base.modeset_init = msm_edp_modeset_init;
>>>> +
>>>> return edp;
>>>>
>>>> fail:
>>>> @@ -82,7 +87,8 @@ static int edp_bind(struct device *dev, struct
>>>> device
>>>> *master, void *data)
>>>> edp = edp_init(to_platform_device(dev));
>>>> if (IS_ERR(edp))
>>>> return PTR_ERR(edp);
>>>> - priv->edp = edp;
>>>> +
>>>> + priv->edp = &edp->base;
>>>>
>>>> return 0;
>>>> }
>>>> @@ -144,13 +150,19 @@ void __exit msm_edp_unregister(void)
>>>> }
>>>>
>>>> /* Second part of initialization, the drm/kms level modeset_init */
>>>> -int msm_edp_modeset_init(struct msm_edp *edp, struct drm_device *dev,
>>>> - struct drm_encoder *encoder)
>>>> +static int msm_edp_modeset_init(struct msm_drm_sub_dev *base,
>>>> + struct drm_device *dev)
>>>> {
>>>> + struct msm_edp *edp = container_of(base, struct msm_edp,
>>>> base);
>>>> struct platform_device *pdev = edp->pdev;
>>>> struct msm_drm_private *priv = dev->dev_private;
>>>> + struct drm_encoder *encoder;
>>>> int ret;
>>>>
>>>> + if (WARN_ON(base->num_encoders != 1))
>>>> + return -EINVAL;
>>>> +
>>>> + encoder = base->encoders[0];
>>>> edp->encoder = encoder;
>>>> edp->dev = dev;
>>>>
>>>> diff --git a/drivers/gpu/drm/msm/edp/edp.h
>>>> b/drivers/gpu/drm/msm/edp/edp.h
>>>> index ba5bedd..00eff68 100644
>>>> --- a/drivers/gpu/drm/msm/edp/edp.h
>>>> +++ b/drivers/gpu/drm/msm/edp/edp.h
>>>> @@ -31,6 +31,7 @@ struct edp_aux;
>>>> struct edp_phy;
>>>>
>>>> struct msm_edp {
>>>> + struct msm_drm_sub_dev base;
>>>> struct drm_device *dev;
>>>> struct platform_device *pdev;
>>>>
>>>> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c
>>>> b/drivers/gpu/drm/msm/hdmi/hdmi.c
>>>> index 9a8a825..9e886ec 100644
>>>> --- a/drivers/gpu/drm/msm/hdmi/hdmi.c
>>>> +++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
>>>> @@ -19,6 +19,9 @@
>>>> #include <linux/of_irq.h>
>>>> #include "hdmi.h"
>>>>
>>>> +static int hdmi_modeset_init(struct msm_drm_sub_dev *base,
>>>> + struct drm_device *dev);
>>>> +
>>>> void hdmi_set_mode(struct hdmi *hdmi, bool power_on)
>>>> {
>>>> uint32_t ctrl = 0;
>>>> @@ -197,6 +200,8 @@ static struct hdmi *hdmi_init(struct
>>>> platform_device
>>>> *pdev)
>>>> goto fail;
>>>> }
>>>>
>>>> + hdmi->base.modeset_init = hdmi_modeset_init;
>>>> +
>>>> return hdmi;
>>>>
>>>> fail:
>>>> @@ -214,13 +219,19 @@ fail:
>>>> * should be handled in hdmi_init() so that failure happens from
>>>> * hdmi sub-device's probe.
>>>> */
>>>> -int hdmi_modeset_init(struct hdmi *hdmi,
>>>> - struct drm_device *dev, struct drm_encoder *encoder)
>>>> +static int hdmi_modeset_init(struct msm_drm_sub_dev *base,
>>>> + struct drm_device *dev)
>>>> {
>>>> + struct hdmi *hdmi = container_of(base, struct hdmi, base);
>>>> struct msm_drm_private *priv = dev->dev_private;
>>>> struct platform_device *pdev = hdmi->pdev;
>>>> + struct drm_encoder *encoder;
>>>> int ret;
>>>>
>>>> + if (WARN_ON(base->num_encoders != 1))
>>>> + return -EINVAL;
>>>> +
>>>> + encoder = base->encoders[0];
>>>> hdmi->dev = dev;
>>>> hdmi->encoder = encoder;
>>>>
>>>> @@ -439,7 +450,8 @@ static int hdmi_bind(struct device *dev, struct
>>>> device *master, void *data)
>>>> hdmi = hdmi_init(to_platform_device(dev));
>>>> if (IS_ERR(hdmi))
>>>> return PTR_ERR(hdmi);
>>>> - priv->hdmi = hdmi;
>>>> +
>>>> + priv->hdmi = &hdmi->base;
>>>>
>>>> return 0;
>>>> }
>>>> @@ -449,8 +461,10 @@ static void hdmi_unbind(struct device *dev,
>>>> struct
>>>> device *master,
>>>> {
>>>> struct drm_device *drm = dev_get_drvdata(master);
>>>> struct msm_drm_private *priv = drm->dev_private;
>>>> +
>>>> if (priv->hdmi) {
>>>> - hdmi_destroy(priv->hdmi);
>>>> + struct hdmi *hdmi = container_of(priv->hdmi, struct
>>>> hdmi, base);
>>>> + hdmi_destroy(hdmi);
>>>> priv->hdmi = NULL;
>>>> }
>>>> }
>>>> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.h
>>>> b/drivers/gpu/drm/msm/hdmi/hdmi.h
>>>> index 68fdfb3..a1d4595 100644
>>>> --- a/drivers/gpu/drm/msm/hdmi/hdmi.h
>>>> +++ b/drivers/gpu/drm/msm/hdmi/hdmi.h
>>>> @@ -38,6 +38,7 @@ struct hdmi_audio {
>>>> };
>>>>
>>>> struct hdmi {
>>>> + struct msm_drm_sub_dev base;
>>>> struct drm_device *dev;
>>>> struct platform_device *pdev;
>>>>
>>>> diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
>>>> b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
>>>> index 24c38d4..02426ba 100644
>>>> --- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
>>>> +++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
>>>> @@ -370,7 +370,8 @@ static int modeset_init(struct mdp4_kms *mdp4_kms)
>>>>
>>>> if (priv->hdmi) {
>>>> /* Construct bridge/connector for HDMI: */
>>>> - ret = hdmi_modeset_init(priv->hdmi, dev, encoder);
>>>> + priv->hdmi->encoders[priv->hdmi->num_encoders++] =
>>>> encoder;
>>>> + ret = priv->hdmi->modeset_init(priv->hdmi, dev);
>>>> if (ret) {
>>>> dev_err(dev->dev, "failed to initialize HDMI:
>>>> %d\n", ret);
>>>> goto fail;
>>>> diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
>>>> b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
>>>> index 84168bf..ae336ec 100644
>>>> --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
>>>> +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
>>>> @@ -1,5 +1,5 @@
>>>> /*
>>>> - * Copyright (c) 2014, The Linux Foundation. All rights reserved.
>>>> + * Copyright (c) 2014-2015, The Linux Foundation. All rights
>>>> reserved.
>>>> * Copyright (C) 2013 Red Hat
>>>> * Author: Rob Clark <robdclark@...il.com>
>>>> *
>>>> @@ -166,8 +166,9 @@ int mdp5_enable(struct mdp5_kms *mdp5_kms)
>>>> return 0;
>>>> }
>>>>
>>>> -static int construct_encoder(struct mdp5_kms *mdp5_kms,
>>>> - enum mdp5_intf_type intf_type, int intf_num)
>>>> +static struct drm_encoder *construct_encoder(struct mdp5_kms
>>>> *mdp5_kms,
>>>> + enum mdp5_intf_type intf_type, int intf_num,
>>>> + enum mdp5_intf_mode intf_mode)
>>>> {
>>>> struct drm_device *dev = mdp5_kms->dev;
>>>> struct msm_drm_private *priv = dev->dev_private;
>>>> @@ -175,33 +176,19 @@ static int construct_encoder(struct mdp5_kms
>>>> *mdp5_kms,
>>>> struct mdp5_interface intf = {
>>>> .num = intf_num,
>>>> .type = intf_type,
>>>> - .mode = MDP5_INTF_MODE_NONE,
>>>> + .mode = intf_mode,
>>>> };
>>>> - int ret = 0;
>>>>
>>>> encoder = mdp5_encoder_init(dev, &intf);
>>>> if (IS_ERR(encoder)) {
>>>> - ret = PTR_ERR(encoder);
>>>> - dev_err(dev->dev, "failed to construct encoder: %d\n",
>>>> ret);
>>>> - return ret;
>>>> + dev_err(dev->dev, "failed to construct encoder\n");
>>>> + return encoder;
>>>> }
>>>>
>>>> encoder->possible_crtcs = (1 << priv->num_crtcs) - 1;
>>>> priv->encoders[priv->num_encoders++] = encoder;
>>>>
>>>> - if (intf_type == INTF_HDMI) {
>>>> - ret = hdmi_modeset_init(priv->hdmi, dev, encoder);
>>>> - if (ret)
>>>> - dev_err(dev->dev, "failed to init HDMI: %d\n",
>>>> ret);
>>>> -
>>>> - } else if (intf_type == INTF_eDP) {
>>>> - /* Construct bridge/connector for eDP: */
>>>> - ret = msm_edp_modeset_init(priv->edp, dev, encoder);
>>>> - if (ret)
>>>> - dev_err(dev->dev, "failed to init eDP: %d\n",
>>>> ret);
>>>> - }
>>>> -
>>>> - return ret;
>>>> + return encoder;
>>>> }
>>>>
>>>> static int modeset_init(struct mdp5_kms *mdp5_kms)
>>>> @@ -267,26 +254,39 @@ static int modeset_init(struct mdp5_kms
>>>> *mdp5_kms)
>>>> /* Construct external display interfaces' encoders: */
>>>> for (i = 0; i < ARRAY_SIZE(hw_cfg->intfs); i++) {
>>>> enum mdp5_intf_type intf_type = hw_cfg->intfs[i];
>>>> + enum mdp5_intf_mode intf_mode = MDP5_INTF_MODE_NONE;
>>>> + struct msm_drm_sub_dev *sub_dev;
>>>> + struct drm_encoder *encoder;
>>>>
>>>> switch (intf_type) {
>>>> case INTF_DISABLED:
>>>> + sub_dev = NULL;
>>>> break;
>>>> case INTF_eDP:
>>>> - if (priv->edp)
>>>> - ret = construct_encoder(mdp5_kms,
>>>> INTF_eDP, i);
>>>> + sub_dev = priv->edp;
>>>> break;
>>>> case INTF_HDMI:
>>>> - if (priv->hdmi)
>>>> - ret = construct_encoder(mdp5_kms,
>>>> INTF_HDMI, i);
>>>> + sub_dev = priv->hdmi;
>>>> break;
>>>> default:
>>>> dev_err(dev->dev, "unknown intf: %d\n",
>>>> intf_type);
>>>> ret = -EINVAL;
>>>> - break;
>>>> + goto fail;
>>>> }
>>>>
>>>> - if (ret)
>>>> - goto fail;
>>>> + if (sub_dev) {
>>>> + encoder = construct_encoder(mdp5_kms,
>>>> intf_type,
>>>> + i, intf_mode);
>>>> + if (IS_ERR(encoder)) {
>>>> + ret = PTR_ERR(encoder);
>>>> + goto fail;
>>>> + }
>>>> +
>>>> + sub_dev->encoders[sub_dev->num_encoders++] =
>>>> encoder;
>>>> + ret = sub_dev->modeset_init(sub_dev, dev);
>>>> + if (ret)
>>>> + goto fail;
>>>> + }
>>>> }
>>>>
>>>> return 0;
>>>> diff --git a/drivers/gpu/drm/msm/msm_drv.h
>>>> b/drivers/gpu/drm/msm/msm_drv.h
>>>> index 9e8d441..7b464db 100644
>>>> --- a/drivers/gpu/drm/msm/msm_drv.h
>>>> +++ b/drivers/gpu/drm/msm/msm_drv.h
>>>> @@ -64,6 +64,19 @@ struct msm_file_private {
>>>> int dummy;
>>>> };
>>>>
>>>> +/* A base data structure for all MDP sub devices */
>>>> +struct msm_drm_sub_dev {
>>>> + /*
>>>> + * the encoders can be used by sub dev,
>>>> + * must be set before modeset_init
>>>> + */
>>>> + unsigned int num_encoders;
>>>> + struct drm_encoder *encoders[8];
>>>> +
>>>> + int (*modeset_init)(struct msm_drm_sub_dev *base,
>>>> + struct drm_device *dev);
>>>> +};
>>>> +
>>>> struct msm_drm_private {
>>>>
>>>> struct msm_kms *kms;
>>>> @@ -74,13 +87,13 @@ struct msm_drm_private {
>>>> /* possibly this should be in the kms component, but it is
>>>> * shared by both mdp4 and mdp5..
>>>> */
>>>> - struct hdmi *hdmi;
>>>> + struct msm_drm_sub_dev *hdmi;
>>>>
>>>> /* eDP is for mdp5 only, but kms has not been created
>>>> * when edp_bind() and edp_init() are called. Here is the only
>>>> * place to keep the edp instance.
>>>> */
>>>> - struct msm_edp *edp;
>>>> + struct msm_drm_sub_dev *edp;
>>>>
>>>> /* when we have more than one 'msm_gpu' these need to be an
>>>> array: */
>>>> struct msm_gpu *gpu;
>>>> @@ -224,17 +237,11 @@ struct drm_framebuffer
>>>> *msm_framebuffer_create(struct drm_device *dev,
>>>>
>>>> struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev);
>>>>
>>>> -struct hdmi;
>>>> -int hdmi_modeset_init(struct hdmi *hdmi, struct drm_device *dev,
>>>> - struct drm_encoder *encoder);
>>>> void __init hdmi_register(void);
>>>> void __exit hdmi_unregister(void);
>>>>
>>>> -struct msm_edp;
>>>> void __init msm_edp_register(void);
>>>> void __exit msm_edp_unregister(void);
>>>> -int msm_edp_modeset_init(struct msm_edp *edp, struct drm_device *dev,
>>>> - struct drm_encoder *encoder);
>>>>
>>>> #ifdef CONFIG_DEBUG_FS
>>>> void msm_gem_describe(struct drm_gem_object *obj, struct seq_file
>>>> *m);
>>>> --
>>>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
>>>> Forum,
>>>> a Linux Foundation Collaborative Project
>>>>
>>>
>>
>>
>
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