| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <206b071f-2b57-c4a2-31b3-2f469091e5e2@rock-chips.com>
Date: Tue, 5 Dec 2017 17:14:11 +0800
From: Nickey Yang <nickey.yang@...k-chips.com>
To: Philippe CORNU <philippe.cornu@...com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"heiko@...ech.de" <heiko@...ech.de>,
"mark.rutland@....com" <mark.rutland@....com>,
"airlied@...ux.ie" <airlied@...ux.ie>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"linux-rockchip@...ts.infradead.org"
<linux-rockchip@...ts.infradead.org>,
"laurent.pinchart@...asonboard.com"
<laurent.pinchart@...asonboard.com>,
"seanpaul@...omium.org" <seanpaul@...omium.org>,
"briannorris@...omium.org" <briannorris@...omium.org>,
"mka@...omium.org" <mka@...omium.org>,
"hoegsberg@...il.com" <hoegsberg@...il.com>,
"architt@...eaurora.org" <architt@...eaurora.org>,
Yannick FERTRE <yannick.fertre@...com>,
"hl@...k-chips.com" <hl@...k-chips.com>,
"zyw@...k-chips.com" <zyw@...k-chips.com>,
"xbl@...k-chips.com" <xbl@...k-chips.com>
Subject: Re: [PATCH v4 1/3] drm/bridge/synopsys: dsi: stop clobbering drvdata
Hi Philippe,
On 2017年12月01日 18:07, Philippe CORNU wrote:
> Hi Nickey,
>
> On 12/01/2017 10:11 AM, Nickey Yang wrote:
>> Hi Philippe,
>>
>>
>> On 2017年12月01日 16:32, Philippe CORNU wrote:
>>> Dear Nickey,
>>>
>>> Many thanks for your patch.
>>>
>>> I am sorry to say that but you can not add my "Acked-by" to this patch
>>> because this code is different from the "original" one from Brian (which
>>> got my "Acked-by").
>> I'm sorry I didn't think much about it, Thank you for correcting me.
>>> Sometimes it is not an issue because differences are not important but
>>> in this particular case, the code is really different: you have remove
>>> platform_set_drvdata() & platform_get_drvdata() in the stm part.
>>>
>>> Could you please go back to the original code or propose me an updated
>>> version of this code.
>> Could you help update new version of this code(stm part) and then test on
>> stm platform?
> I think you can simply goes back to the original version from Brian (see
> the discussion thread in https://patchwork.kernel.org/patch/10078493/)
> unless you have specific/good reasons for modifying the code as you did.
mmm,I'm sorry, I feel a little puzzled. Do you means we should abandon
Brian's patch (https://patchwork.kernel.org/patch/10078493/)?
I think we need to adjust stm part because dw_mipi_dsi_stm.c calls
bridge's drivers if we want merge Brian's patch.
Thanks
> Many thanks,
> Philippe :)
>
>> Thanks,
>> Nickey.
>>> Many thanks,
>>>
>>> Philippe :-)
>>>
>>>
>>> On 12/01/2017 04:58 AM, Nickey Yang wrote:
>>>> From: Brian Norris<briannorris@...omium.org>
>>>>
>>>> Bridge drivers/helpers shouldn't be clobbering the drvdata, since a
>>>> parent driver might need to own this. Instead, let's return our
>>>> 'dw_mipi_dsi' object and have callers pass that back to us for removal.
>>>>
>>>> Signed-off-by: Brian Norris<briannorris@...omium.org>
>>>> Signed-off-by: Nickey Yang<nickey.yang@...k-chips.com>
>>>> Reviewed-by: Matthias Kaehlcke<mka@...omium.org>
>>>> Reviewed-by: Archit Taneja<architt@...eaurora.org>
>>>> Acked-by: Philippe Cornu<philippe.cornu@...com>
>>>> Link:https://patchwork.kernel.org/patch/10078493/
>>>>
>>>> ---
>>>> Changes in v4:
>>>> - Add From tag,update subject line
>>>> - keep patch "drm/stm: dsi: Adjust dw_mipi_dsi_probe and remove"
>>>> in this piece together.
>>>>
>>>> drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 36 ++++++++++-----------------
>>>> drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 8 +++---
>>>> include/drm/bridge/dw_mipi_dsi.h | 17 ++++++++-----
>>>> 3 files changed, 29 insertions(+), 32 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>>>> index d9cca4f..c39c7dc 100644
>>>> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>>>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>>>> @@ -922,8 +922,6 @@ static int dw_mipi_dsi_bridge_attach(struct drm_bridge *bridge)
>>>> dsi->bridge.of_node = pdev->dev.of_node;
>>>> #endif
>>>>
>>>> - dev_set_drvdata(dev, dsi);
>>>> -
>>>> return dsi;
>>>> }
>>>>
>>>> @@ -935,23 +933,16 @@ static void __dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
>>>> /*
>>>> * Probe/remove API, used from platforms based on the DRM bridge API.
>>>> */
>>>> -int dw_mipi_dsi_probe(struct platform_device *pdev,
>>>> - const struct dw_mipi_dsi_plat_data *plat_data)
>>>> +struct dw_mipi_dsi *
>>>> +dw_mipi_dsi_probe(struct platform_device *pdev,
>>>> + const struct dw_mipi_dsi_plat_data *plat_data)
>>>> {
>>>> - struct dw_mipi_dsi *dsi;
>>>> -
>>>> - dsi = __dw_mipi_dsi_probe(pdev, plat_data);
>>>> - if (IS_ERR(dsi))
>>>> - return PTR_ERR(dsi);
>>>> -
>>>> - return 0;
>>>> + return __dw_mipi_dsi_probe(pdev, plat_data);
>>>> }
>>>> EXPORT_SYMBOL_GPL(dw_mipi_dsi_probe);
>>>>
>>>> -void dw_mipi_dsi_remove(struct platform_device *pdev)
>>>> +void dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
>>>> {
>>>> - struct dw_mipi_dsi *dsi = platform_get_drvdata(pdev);
>>>> -
>>>> mipi_dsi_host_unregister(&dsi->dsi_host);
>>>>
>>>> __dw_mipi_dsi_remove(dsi);
>>>> @@ -961,31 +952,30 @@ void dw_mipi_dsi_remove(struct platform_device *pdev)
>>>> /*
>>>> * Bind/unbind API, used from platforms based on the component framework.
>>>> */
>>>> -int dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
>>>> - const struct dw_mipi_dsi_plat_data *plat_data)
>>>> +struct dw_mipi_dsi *
>>>> +dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
>>>> + const struct dw_mipi_dsi_plat_data *plat_data)
>>>> {
>>>> struct dw_mipi_dsi *dsi;
>>>> int ret;
>>>>
>>>> dsi = __dw_mipi_dsi_probe(pdev, plat_data);
>>>> if (IS_ERR(dsi))
>>>> - return PTR_ERR(dsi);
>>>> + return dsi;
>>>>
>>>> ret = drm_bridge_attach(encoder, &dsi->bridge, NULL);
>>>> if (ret) {
>>>> - dw_mipi_dsi_remove(pdev);
>>>> + dw_mipi_dsi_remove(dsi);
>>>> DRM_ERROR("Failed to initialize bridge with drm\n");
>>>> - return ret;
>>>> + return ERR_PTR(ret);
>>>> }
>>>>
>>>> - return 0;
>>>> + return dsi;
>>>> }
>>>> EXPORT_SYMBOL_GPL(dw_mipi_dsi_bind);
>>>>
>>>> -void dw_mipi_dsi_unbind(struct device *dev)
>>>> +void dw_mipi_dsi_unbind(struct dw_mipi_dsi *dsi)
>>>> {
>>>> - struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
>>>> -
>>>> __dw_mipi_dsi_remove(dsi);
>>>> }
>>>> EXPORT_SYMBOL_GPL(dw_mipi_dsi_unbind);
>>>> diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
>>>> index e5b6310..80f9950 100644
>>>> --- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
>>>> +++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
>>>> @@ -66,6 +66,7 @@ enum dsi_color {
>>>> struct dw_mipi_dsi_stm {
>>>> void __iomem *base;
>>>> struct clk *pllref_clk;
>>>> + struct dw_mipi_dsi *dmd;
>>>> };
>>>>
>>>> static inline void dsi_write(struct dw_mipi_dsi_stm *dsi, u32 reg, u32 val)
>>>> @@ -318,10 +319,11 @@ static int dw_mipi_dsi_stm_probe(struct platform_device *pdev)
>>>> dw_mipi_dsi_stm_plat_data.base = dsi->base;
>>>> dw_mipi_dsi_stm_plat_data.priv_data = dsi;
>>>>
>>>> - ret = dw_mipi_dsi_probe(pdev, &dw_mipi_dsi_stm_plat_data);
>>>> - if (ret) {
>>>> + dsi->dmd = dw_mipi_dsi_probe(pdev, &dw_mipi_dsi_stm_plat_data);
>>>> + if (IS_ERR(dsi->dmd)) {
>>>> DRM_ERROR("Failed to initialize mipi dsi host\n");
>>>> clk_disable_unprepare(dsi->pllref_clk);
>>>> + return PTR_ERR(dsi->dmd);
>>>> }
>>>>
>>>> return ret;
>>>> @@ -332,7 +334,7 @@ static int dw_mipi_dsi_stm_remove(struct platform_device *pdev)
>>>> struct dw_mipi_dsi_stm *dsi = dw_mipi_dsi_stm_plat_data.priv_data;
>>>>
>>>> clk_disable_unprepare(dsi->pllref_clk);
>>>> - dw_mipi_dsi_remove(pdev);
>>>> + dw_mipi_dsi_remove(dsi->dmd);
>>>>
>>>> return 0;
>>>> }
>>>> diff --git a/include/drm/bridge/dw_mipi_dsi.h b/include/drm/bridge/dw_mipi_dsi.h
>>>> index 9b30fec..d9c6d54 100644
>>>> --- a/include/drm/bridge/dw_mipi_dsi.h
>>>> +++ b/include/drm/bridge/dw_mipi_dsi.h
>>>> @@ -10,6 +10,8 @@
>>>> #ifndef __DW_MIPI_DSI__
>>>> #define __DW_MIPI_DSI__
>>>>
>>>> +struct dw_mipi_dsi;
>>>> +
>>>> struct dw_mipi_dsi_phy_ops {
>>>> int (*init)(void *priv_data);
>>>> int (*get_lane_mbps)(void *priv_data, struct drm_display_mode *mode,
>>>> @@ -29,11 +31,14 @@ struct dw_mipi_dsi_plat_data {
>>>> void *priv_data;
>>>> };
>>>>
>>>> -int dw_mipi_dsi_probe(struct platform_device *pdev,
>>>> - const struct dw_mipi_dsi_plat_data *plat_data);
>>>> -void dw_mipi_dsi_remove(struct platform_device *pdev);
>>>> -int dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
>>>> - const struct dw_mipi_dsi_plat_data *plat_data);
>>>> -void dw_mipi_dsi_unbind(struct device *dev);
>>>> +struct dw_mipi_dsi *dw_mipi_dsi_probe(struct platform_device *pdev,
>>>> + const struct dw_mipi_dsi_plat_data
>>>> + *plat_data);
>>>> +void dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi);
>>>> +struct dw_mipi_dsi *dw_mipi_dsi_bind(struct platform_device *pdev,
>>>> + struct drm_encoder *encoder,
>>>> + const struct dw_mipi_dsi_plat_data
>>>> + *plat_data);
>>>> +void dw_mipi_dsi_unbind(struct dw_mipi_dsi *dsi);
>>>>
>>>> #endif /* __DW_MIPI_DSI__ */
Powered by blists - more mailing lists