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Message-ID: <fcdc74a6-2ff9-34c6-6b07-ee7e55d6bc8d@collabora.com>
Date: Wed, 8 Jul 2020 17:15:55 +0200
From: Enric Balletbo i Serra <enric.balletbo@...labora.com>
To: Boris Brezillon <boris.brezillon@...labora.com>
Cc: linux-kernel@...r.kernel.org,
Collabora Kernel ML <kernel@...labora.com>,
narmstrong@...libre.com, a.hajda@...sung.com,
laurent.pinchart@...asonboard.com, matthias.bgg@...il.com,
drinkcat@...omium.org, hsinyi@...omium.org,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...ux.ie>,
Philipp Zabel <p.zabel@...gutronix.de>,
dri-devel@...ts.freedesktop.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: Re: [RESEND PATCH 2/3] drm/mediatek: mtk_dpi: Convert to bridge
driver
Hi Boris,
Thank you for review the patch.
On 1/7/20 13:51, Boris Brezillon wrote:
> On Mon, 18 May 2020 19:39:08 +0200
> Enric Balletbo i Serra <enric.balletbo@...labora.com> wrote:
>
>> Convert mtk_dpi to a bridge driver with built-in encoder support for
>> compatibility with existing component drivers.
>>
>> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
>> Reviewed-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
>> ---
>>
>> drivers/gpu/drm/mediatek/mtk_dpi.c | 66 +++++++++++++++---------------
>> 1 file changed, 34 insertions(+), 32 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
>> index 7112125dc3d1..baad198c69eb 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
>> @@ -61,6 +61,7 @@ enum mtk_dpi_out_color_format {
>> struct mtk_dpi {
>> struct mtk_ddp_comp ddp_comp;
>> struct drm_encoder encoder;
>> + struct drm_bridge bridge;
>> struct drm_bridge *next_bridge;
>> void __iomem *regs;
>> struct device *dev;
>> @@ -77,9 +78,9 @@ struct mtk_dpi {
>> int refcount;
>> };
>>
>> -static inline struct mtk_dpi *mtk_dpi_from_encoder(struct drm_encoder *e)
>> +static inline struct mtk_dpi *bridge_to_dpi(struct drm_bridge *b)
>> {
>> - return container_of(e, struct mtk_dpi, encoder);
>> + return container_of(b, struct mtk_dpi, bridge);
>> }
>>
>> enum mtk_dpi_polarity {
>> @@ -518,50 +519,44 @@ static const struct drm_encoder_funcs mtk_dpi_encoder_funcs = {
>> .destroy = mtk_dpi_encoder_destroy,
>> };
>>
>> -static bool mtk_dpi_encoder_mode_fixup(struct drm_encoder *encoder,
>> - const struct drm_display_mode *mode,
>> - struct drm_display_mode *adjusted_mode)
>> +static int mtk_dpi_bridge_attach(struct drm_bridge *bridge,
>> + enum drm_bridge_attach_flags flags)
>> {
>> - return true;
>> + struct mtk_dpi *dpi = bridge_to_dpi(bridge);
>> +
>> + return drm_bridge_attach(bridge->encoder, dpi->next_bridge,
>> + &dpi->bridge, flags);
>> }
>>
>> -static void mtk_dpi_encoder_mode_set(struct drm_encoder *encoder,
>> - struct drm_display_mode *mode,
>> - struct drm_display_mode *adjusted_mode)
>> +static void mtk_dpi_bridge_mode_set(struct drm_bridge *bridge,
>> + const struct drm_display_mode *mode,
>> + const struct drm_display_mode *adjusted_mode)
>> {
>> - struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
>> + struct mtk_dpi *dpi = bridge_to_dpi(bridge);
>>
>> drm_mode_copy(&dpi->mode, adjusted_mode);
>> }
>>
>> -static void mtk_dpi_encoder_disable(struct drm_encoder *encoder)
>> +static void mtk_dpi_bridge_disable(struct drm_bridge *bridge)
>> {
>> - struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
>> + struct mtk_dpi *dpi = bridge_to_dpi(bridge);
>>
>> mtk_dpi_power_off(dpi);
>> }
>>
>> -static void mtk_dpi_encoder_enable(struct drm_encoder *encoder)
>> +static void mtk_dpi_bridge_enable(struct drm_bridge *bridge)
>> {
>> - struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
>> + struct mtk_dpi *dpi = bridge_to_dpi(bridge);
>>
>> mtk_dpi_power_on(dpi);
>> mtk_dpi_set_display_mode(dpi, &dpi->mode);
>> }
>>
>> -static int mtk_dpi_atomic_check(struct drm_encoder *encoder,
>> - struct drm_crtc_state *crtc_state,
>> - struct drm_connector_state *conn_state)
>> -{
>> - return 0;
>> -}
>> -
>> -static const struct drm_encoder_helper_funcs mtk_dpi_encoder_helper_funcs = {
>> - .mode_fixup = mtk_dpi_encoder_mode_fixup,
>> - .mode_set = mtk_dpi_encoder_mode_set,
>> - .disable = mtk_dpi_encoder_disable,
>> - .enable = mtk_dpi_encoder_enable,
>> - .atomic_check = mtk_dpi_atomic_check,
>> +static const struct drm_bridge_funcs mtk_dpi_bridge_funcs = {
>> + .attach = mtk_dpi_bridge_attach,
>> + .mode_set = mtk_dpi_bridge_mode_set,
>> + .disable = mtk_dpi_bridge_disable,
>> + .enable = mtk_dpi_bridge_enable,
>> };
>>
>> static void mtk_dpi_start(struct mtk_ddp_comp *comp)
>> @@ -602,16 +597,13 @@ static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
>> dev_err(dev, "Failed to initialize decoder: %d\n", ret);
>> goto err_unregister;
>> }
>> - drm_encoder_helper_add(&dpi->encoder, &mtk_dpi_encoder_helper_funcs);
>>
>> /* Currently DPI0 is fixed to be driven by OVL1 */
>> dpi->encoder.possible_crtcs = BIT(1);
>>
>> - ret = drm_bridge_attach(&dpi->encoder, dpi->next_bridge, NULL, 0);
>> - if (ret) {
>> - dev_err(dev, "Failed to attach bridge: %d\n", ret);
>
> Any reason your decided to drop this error message? If there's one,
> this should probably happen in a separate patch.
>
Right, I'll maintain the error in next version.
>> + ret = drm_bridge_attach(&dpi->encoder, &dpi->bridge, NULL, 0);
>> + if (ret)
>> goto err_cleanup;
>> - }
>>
>> dpi->bit_num = MTK_DPI_OUT_BIT_NUM_8BITS;
>> dpi->channel_swap = MTK_DPI_OUT_CHANNEL_SWAP_RGB;
>> @@ -768,8 +760,15 @@ static int mtk_dpi_probe(struct platform_device *pdev)
>>
>> platform_set_drvdata(pdev, dpi);
>>
>> + dpi->bridge.funcs = &mtk_dpi_bridge_funcs;
>> + dpi->bridge.of_node = dev->of_node;
>> + dpi->bridge.type = DRM_MODE_CONNECTOR_DPI;
>> +
>> + drm_bridge_add(&dpi->bridge);
>
> I wonder if it's really useful to add the bridge when it's private (you
> don't want this bridge to be added to external bridge chains).
>
>> +
>> ret = component_add(dev, &mtk_dpi_component_ops);
>> if (ret) {
>> + drm_bridge_remove(&dpi->bridge);
>> dev_err(dev, "Failed to add component: %d\n", ret);
>> return ret;
>> }
>> @@ -779,7 +778,10 @@ static int mtk_dpi_probe(struct platform_device *pdev)
>>
>> static int mtk_dpi_remove(struct platform_device *pdev)
>> {
>> + struct mtk_dpi *dpi = platform_get_drvdata(pdev);
>> +
>> component_del(&pdev->dev, &mtk_dpi_component_ops);
>> + drm_bridge_remove(&dpi->bridge);
>>
>> return 0;
>> }
>
>
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