dri-devel Digest, Vol 132, Issue 196

Wed Mar 10 14:15:32 UTC 2021

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-------- Original Message --------
On Mar 10, 2021, 12:10, wrote:

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> Today's Topics:
>
> 1. [PATCH v5 10/14] drm/bridge: imx: Add LDB driver helper
> support (Liu Ying)
> 2. [PATCH v5 11/14] dt-bindings: display: bridge: Add
> i.MX8qm/qxp LVDS display bridge binding (Liu Ying)
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 10 Mar 2021 17:55:34 +0800
> From: Liu Ying <victor.liu at nxp.com>
> To: dri-devel at lists.freedesktop.org, devicetree at vger.kernel.org,
> linux-arm-kernel at lists.infradead.org, linux-kernel at vger.kernel.org,
> linux-media at vger.kernel.org
> Cc: airlied at linux.ie, daniel at ffwll.ch, robh+dt at kernel.org,
> shawnguo at kernel.org, s.hauer at pengutronix.de, kernel at pengutronix.de,
> festevam at gmail.com, linux-imx at nxp.com, mchehab at kernel.org,
> a.hajda at samsung.com, narmstrong at baylibre.com,
> Laurent.pinchart at ideasonboard.com, jonas at kwiboo.se,
> jernej.skrabec at siol.net, kishon at ti.com, vkoul at kernel.org,
> robert.foss at linaro.org, lee.jones at linaro.org
> Subject: [PATCH v5 10/14] drm/bridge: imx: Add LDB driver helper
> support
> Message-ID: <1615370138-5673-11-git-send-email-victor.liu at nxp.com>
> Content-Type: text/plain
>
> This patch adds a helper to support LDB drm bridge drivers for
> i.MX SoCs. Helper functions supported by this helper should
> implement common logics for all LDB modules embedded in i.MX SoCs.
>
> Signed-off-by: Liu Ying <victor.liu at nxp.com>
> ---
> v4->v5:
> * Make imx-ldb-helper be a pure object to be linked with i.MX8qxp LDB bridge
> driver and i.MX8qm LDB bridge driver. (Robert)
> * Move 'imx_ldb_helper.h' to 'drivers/gpu/drm/bridge/imx/imx-ldb-helper.h'.
> (Robert)
> * s/__FSL_IMX_LDB__/__IMX_LDB_HELPER__/ for 'imx-ldb-helper.h'.
>
> v3->v4:
> * No change.
>
> v2->v3:
> * Call syscon_node_to_regmap() to get regmap instead of
> syscon_regmap_lookup_by_phandle().
>
> v1->v2:
> * No change.
>
> drivers/gpu/drm/bridge/imx/imx-ldb-helper.c | 232 ++++++++++++++++++++++++++++
> drivers/gpu/drm/bridge/imx/imx-ldb-helper.h | 98 ++++++++++++
> 2 files changed, 330 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/imx/imx-ldb-helper.c
> create mode 100644 drivers/gpu/drm/bridge/imx/imx-ldb-helper.h
>
> diff --git a/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c
> new file mode 100644
> index 00000000..d01c4ff9
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c
> @@ -0,0 +1,232 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2012 Sascha Hauer, Pengutronix
> + * Copyright 2019,2020 NXP
> + */
> +
> +#include <linux/mfd/syscon.h>
> +#include <linux/of.h>
> +#include <linux/regmap.h>
> +
> +#include <drm/drm_of.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_print.h>
> +
> +#include "imx-ldb-helper.h"
> +
> +bool ldb_channel_is_single_link(struct ldb_channel *ldb_ch)
> +{
> + return ldb_ch->link_type == LDB_CH_SINGLE_LINK;
> +}
> +
> +bool ldb_channel_is_split_link(struct ldb_channel *ldb_ch)
> +{
> + return ldb_ch->link_type == LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS ||
> + ldb_ch->link_type == LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS;
> +}
> +
> +int ldb_bridge_atomic_check_helper(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> +{
> + struct ldb_channel *ldb_ch = bridge->driver_private;
> +
> + ldb_ch->in_bus_format = bridge_state->input_bus_cfg.format;
> + ldb_ch->out_bus_format = bridge_state->output_bus_cfg.format;
> +
> + return 0;
> +}
> +
> +void ldb_bridge_mode_set_helper(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adjusted_mode)
> +{
> + struct ldb_channel *ldb_ch = bridge->driver_private;
> + struct ldb *ldb = ldb_ch->ldb;
> + bool is_split = ldb_channel_is_split_link(ldb_ch);
> +
> + if (is_split)
> + ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
> +
> + switch (ldb_ch->out_bus_format) {
> + case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
> + break;
> + case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
> + if (ldb_ch->chno == 0 || is_split)
> + ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
> + if (ldb_ch->chno == 1 || is_split)
> + ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
> + break;
> + case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
> + if (ldb_ch->chno == 0 || is_split)
> + ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
> + LDB_BIT_MAP_CH0_JEIDA;
> + if (ldb_ch->chno == 1 || is_split)
> + ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
> + LDB_BIT_MAP_CH1_JEIDA;
> + break;
> + }
> +}
> +
> +void ldb_bridge_enable_helper(struct drm_bridge *bridge)
> +{
> + struct ldb_channel *ldb_ch = bridge->driver_private;
> + struct ldb *ldb = ldb_ch->ldb;
> +
> + /*
> + * Platform specific bridge drivers should set ldb_ctrl properly
> + * for the enablement, so just write the ctrl_reg here.
> + */
> + regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
> +}
> +
> +void ldb_bridge_disable_helper(struct drm_bridge *bridge)
> +{
> + struct ldb_channel *ldb_ch = bridge->driver_private;
> + struct ldb *ldb = ldb_ch->ldb;
> + bool is_split = ldb_channel_is_split_link(ldb_ch);
> +
> + if (ldb_ch->chno == 0 || is_split)
> + ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
> + if (ldb_ch->chno == 1 || is_split)
> + ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
> +
> + regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
> +}
> +
> +int ldb_bridge_attach_helper(struct drm_bridge *bridge,
> + enum drm_bridge_attach_flags flags)
> +{
> + struct ldb_channel *ldb_ch = bridge->driver_private;
> + struct ldb *ldb = ldb_ch->ldb;
> +
> + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> + DRM_DEV_ERROR(ldb->dev,
> + "do not support creating a drm_connector\n");
> + return -EINVAL;
> + }
> +
> + if (!bridge->encoder) {
> + DRM_DEV_ERROR(ldb->dev, "missing encoder\n");
> + return -ENODEV;
> + }
> +
> + return drm_bridge_attach(bridge->encoder,
> + ldb_ch->next_bridge, bridge,
> + DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> +}
> +
> +int ldb_init_helper(struct ldb *ldb)
> +{
> + struct device *dev = ldb->dev;
> + struct device_node *np = dev->of_node;
> + struct device_node *child;
> + int ret;
> + u32 i;
> +
> + ldb->regmap = syscon_node_to_regmap(np->parent);
> + if (IS_ERR(ldb->regmap)) {
> + ret = PTR_ERR(ldb->regmap);
> + if (ret != -EPROBE_DEFER)
> + DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
> + return ret;
> + }
> +
> + for_each_available_child_of_node(np, child) {
> + struct ldb_channel *ldb_ch;
> +
> + ret = of_property_read_u32(child, "reg", &i);
> + if (ret || i > MAX_LDB_CHAN_NUM - 1) {
> + ret = -EINVAL;
> + DRM_DEV_ERROR(dev,
> + "invalid channel node address: %u\n", i);
> + of_node_put(child);
> + return ret;
> + }
> +
> + ldb_ch = ldb->channel[i];
> + ldb_ch->ldb = ldb;
> + ldb_ch->chno = i;
> + ldb_ch->is_available = true;
> + ldb_ch->np = child;
> +
> + ldb->available_ch_cnt++;
> + }
> +
> + return 0;
> +}
> +
> +int ldb_find_next_bridge_helper(struct ldb *ldb)
> +{
> + struct device *dev = ldb->dev;
> + struct ldb_channel *ldb_ch;
> + int ret, i;
> +
> + for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
> + ldb_ch = ldb->channel[i];
> +
> + if (!ldb_ch->is_available)
> + continue;
> +
> + ret = drm_of_find_panel_or_bridge(ldb_ch->np, 1, 0,
> + &ldb_ch->panel,
> + &ldb_ch->next_bridge);
> + if (ret) {
> + if (ret != -EPROBE_DEFER)
> + DRM_DEV_ERROR(dev,
> + "failed to find panel or bridge: %d\n",
> + ret);
> + return ret;
> + }
> +
> + if (ldb_ch->panel) {
> + ldb_ch->next_bridge = devm_drm_panel_bridge_add(dev,
> + ldb_ch->panel);
> + if (IS_ERR(ldb_ch->next_bridge)) {
> + ret = PTR_ERR(ldb_ch->next_bridge);
> + DRM_DEV_ERROR(dev,
> + "failed to add panel bridge: %d\n",
> + ret);
> + return ret;
> + }
> + }
> + }
> +
> + return 0;
> +}
> +
> +void ldb_add_bridge_helper(struct ldb *ldb,
> + const struct drm_bridge_funcs *bridge_funcs)
> +{
> + struct ldb_channel *ldb_ch;
> + int i;
> +
> + for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
> + ldb_ch = ldb->channel[i];
> +
> + if (!ldb_ch->is_available)
> + continue;
> +
> + ldb_ch->bridge.driver_private = ldb_ch;
> + ldb_ch->bridge.funcs = bridge_funcs;
> + ldb_ch->bridge.of_node = ldb_ch->np;
> +
> + drm_bridge_add(&ldb_ch->bridge);
> + }
> +}
> +
> +void ldb_remove_bridge_helper(struct ldb *ldb)
> +{
> + struct ldb_channel *ldb_ch;
> + int i;
> +
> + for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
> + ldb_ch = ldb->channel[i];
> +
> + if (!ldb_ch->is_available)
> + continue;
> +
> + drm_bridge_remove(&ldb_ch->bridge);
> + }
> +}
> diff --git a/drivers/gpu/drm/bridge/imx/imx-ldb-helper.h b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.h
> new file mode 100644
> index 00000000..748c378
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.h
> @@ -0,0 +1,98 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +
> +/*
> + * Copyright 2019,2020 NXP
> + */
> +
> +#ifndef __IMX_LDB_HELPER__
> +#define __IMX_LDB_HELPER__
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/of.h>
> +#include <linux/regmap.h>
> +
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_device.h>
> +#include <drm/drm_encoder.h>
> +#include <drm/drm_modeset_helper_vtables.h>
> +#include <drm/drm_panel.h>
> +
> +#define LDB_CH0_MODE_EN_TO_DI0 (1 << 0)
> +#define LDB_CH0_MODE_EN_TO_DI1 (3 << 0)
> +#define LDB_CH0_MODE_EN_MASK (3 << 0)
> +#define LDB_CH1_MODE_EN_TO_DI0 (1 << 2)
> +#define LDB_CH1_MODE_EN_TO_DI1 (3 << 2)
> +#define LDB_CH1_MODE_EN_MASK (3 << 2)
> +#define LDB_SPLIT_MODE_EN (1 << 4)
> +#define LDB_DATA_WIDTH_CH0_24 (1 << 5)
> +#define LDB_BIT_MAP_CH0_JEIDA (1 << 6)
> +#define LDB_DATA_WIDTH_CH1_24 (1 << 7)
> +#define LDB_BIT_MAP_CH1_JEIDA (1 << 8)
> +#define LDB_DI0_VS_POL_ACT_LOW (1 << 9)
> +#define LDB_DI1_VS_POL_ACT_LOW (1 << 10)
> +
> +#define MAX_LDB_CHAN_NUM 2
> +
> +enum ldb_channel_link_type {
> + LDB_CH_SINGLE_LINK,
> + LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS,
> + LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS,
> +};
> +
> +struct ldb;
> +
> +struct ldb_channel {
> + struct ldb *ldb;
> + struct drm_bridge bridge;
> + struct drm_panel *panel;
> + struct drm_bridge *next_bridge;
> + struct device_node *np;
> + u32 chno;
> + bool is_available;
> + u32 in_bus_format;
> + u32 out_bus_format;
> + enum ldb_channel_link_type link_type;
> +};
> +
> +struct ldb {
> + struct regmap *regmap;
> + struct device *dev;
> + struct ldb_channel *channel[MAX_LDB_CHAN_NUM];
> + unsigned int ctrl_reg;
> + u32 ldb_ctrl;
> + unsigned int available_ch_cnt;
> +};
> +
> +#define bridge_to_ldb_ch(b) container_of(b, struct ldb_channel, bridge)
> +
> +bool ldb_channel_is_single_link(struct ldb_channel *ldb_ch);
> +bool ldb_channel_is_split_link(struct ldb_channel *ldb_ch);
> +
> +int ldb_bridge_atomic_check_helper(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state);
> +
> +void ldb_bridge_mode_set_helper(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adjusted_mode);
> +
> +void ldb_bridge_enable_helper(struct drm_bridge *bridge);
> +
> +void ldb_bridge_disable_helper(struct drm_bridge *bridge);
> +
> +int ldb_bridge_attach_helper(struct drm_bridge *bridge,
> + enum drm_bridge_attach_flags flags);
> +
> +int ldb_init_helper(struct ldb *ldb);
> +
> +int ldb_find_next_bridge_helper(struct ldb *ldb);
> +
> +void ldb_add_bridge_helper(struct ldb *ldb,
> + const struct drm_bridge_funcs *bridge_funcs);
> +
> +void ldb_remove_bridge_helper(struct ldb *ldb);
> +
> +#endif /* __IMX_LDB_HELPER__ */
> --
> 2.7.4
>
> ------------------------------
>
> Message: 2
> Date: Wed, 10 Mar 2021 17:55:35 +0800
> From: Liu Ying <victor.liu at nxp.com>
> To: dri-devel at lists.freedesktop.org, devicetree at vger.kernel.org,
> linux-arm-kernel at lists.infradead.org, linux-kernel at vger.kernel.org,
> linux-media at vger.kernel.org
> Cc: airlied at linux.ie, daniel at ffwll.ch, robh+dt at kernel.org,
> shawnguo at kernel.org, s.hauer at pengutronix.de, kernel at pengutronix.de,
> festevam at gmail.com, linux-imx at nxp.com, mchehab at kernel.org,
> a.hajda at samsung.com, narmstrong at baylibre.com,
> Laurent.pinchart at ideasonboard.com, jonas at kwiboo.se,
> jernej.skrabec at siol.net, kishon at ti.com, vkoul at kernel.org,
> robert.foss at linaro.org, lee.jones at linaro.org
> Subject: [PATCH v5 11/14] dt-bindings: display: bridge: Add
> i.MX8qm/qxp LVDS display bridge binding
> Message-ID: <1615370138-5673-12-git-send-email-victor.liu at nxp.com>
> Content-Type: text/plain
>
> This patch adds bindings for i.MX8qm/qxp LVDS display bridge(LDB).
>
> Reviewed-by: Rob Herring <robh at kernel.org>
> Signed-off-by: Liu Ying <victor.liu at nxp.com>
> ---
> v4->v5:
> * No change.
>
> v3->v4:
> * Add Rob's R-b tag.
>
> v2->v3:
> * Drop 'fsl,syscon' property. (Rob)
> * Mention the CSR module controls LDB.
>
> v1->v2:
> * Use graph schema. (Laurent)
> * Side note i.MX8qxp LDB official name 'pixel mapper'. (Laurent)
>
> .../bindings/display/bridge/fsl,imx8qxp-ldb.yaml | 173 +++++++++++++++++++++
> 1 file changed, 173 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-ldb.yaml
>
> diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-ldb.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-ldb.yaml
> new file mode 100644
> index 00000000..9454300
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-ldb.yaml
> @@ -0,0 +1,173 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/fsl,imx8qxp-ldb.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale i.MX8qm/qxp LVDS Display Bridge
> +
> +maintainers:
> + - Liu Ying <victor.liu at nxp.com>
> +
> +description: |
> + The Freescale i.MX8qm/qxp LVDS Display Bridge(LDB) has two channels.
> +
> + The i.MX8qm/qxp LDB is controlled by Control and Status Registers(CSR) module.
> + The CSR module, as a system controller, contains the LDB's configuration
> + registers.
> +
> + For i.MX8qxp LDB, each channel supports up to 24bpp parallel input color
> + format and can map the input to VESA or JEIDA standards. The two channels
> + cannot be used simultaneously, that is to say, the user should pick one of
> + them to use. Two LDB channels from two LDB instances can work together in
> + LDB split mode to support a dual link LVDS display. The channel indexes
> + have to be different. Channel0 outputs odd pixels and channel1 outputs
> + even pixels.
> +
> + For i.MX8qm LDB, each channel additionally supports up to 30bpp parallel
> + input color format. The two channels can be used simultaneously, either
> + in dual mode or split mode. In dual mode, the two channels output identical
> + data. In split mode, channel0 outputs odd pixels and channel1 outputs even
> + pixels.
> +
> + A side note is that i.MX8qm/qxp LDB is officially called pixel mapper in
> + the SoC reference manuals. The pixel mapper uses logic of LDBs embedded in
> + i.MX6qdl/sx SoCs, i.e., it is essentially based on them. To keep the naming
> + consistency, this binding calls it LDB.
> +
> +properties:
> + compatible:
> + enum:
> + - fsl,imx8qm-ldb
> + - fsl,imx8qxp-ldb
> +
> + "#address-cells":
> + const: 1
> +
> + "#size-cells":
> + const: 0
> +
> + clocks:
> + items:
> + - description: pixel clock
> + - description: bypass clock
> +
> + clock-names:
> + items:
> + - const: pixel
> + - const: bypass
> +
> + power-domains:
> + maxItems: 1
> +
> + fsl,companion-ldb:
> + $ref: /schemas/types.yaml#/definitions/phandle
> + description: |
> + A phandle which points to companion LDB which is used in LDB split mode.
> +
> +patternProperties:
> + "^channel@[0-1]$":
> + type: object
> + description: Represents a channel of LDB.
> +
> + properties:
> + "#address-cells":
> + const: 1
> +
> + "#size-cells":
> + const: 0
> +
> + reg:
> + description: The channel index.
> + enum: [ 0, 1 ]
> +
> + phys:
> + description: A phandle to the phy module representing the LVDS PHY.
> + maxItems: 1
> +
> + phy-names:
> + const: lvds_phy
> +
> + port at 0:
> + $ref: /schemas/graph.yaml#/properties/port
> + description: Input port of the channel.
> +
> + port at 1:
> + $ref: /schemas/graph.yaml#/properties/port
> + description: Output port of the channel.
> +
> + required:
> + - "#address-cells"
> + - "#size-cells"
> + - reg
> + - phys
> + - phy-names
> +
> + additionalProperties: false
> +
> +required:
> + - compatible
> + - "#address-cells"
> + - "#size-cells"
> + - clocks
> + - clock-names
> + - power-domains
> + - channel at 0
> + - channel at 1
> +
> +allOf:
> + - if:
> + properties:
> + compatible:
> + contains:
> + const: fsl,imx8qm-ldb
> + then:
> + properties:
> + fsl,companion-ldb: false
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/firmware/imx/rsrc.h>
> + ldb {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + compatible = "fsl,imx8qxp-ldb";
> + clocks = <&clk IMX_SC_R_LVDS_0 IMX_SC_PM_CLK_MISC2>,
> + <&clk IMX_SC_R_LVDS_0 IMX_SC_PM_CLK_BYPASS>;
> + clock-names = "pixel", "bypass";
> + power-domains = <&pd IMX_SC_R_LVDS_0>;
> +
> + channel at 0 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + reg = <0>;
> + phys = <&mipi_lvds_0_phy>;
> + phy-names = "lvds_phy";
> +
> + port at 0 {
> + reg = <0>;
> +
> + mipi_lvds_0_ldb_ch0_mipi_lvds_0_pxl2dpi: endpoint {
> + remote-endpoint = <&mipi_lvds_0_pxl2dpi_mipi_lvds_0_ldb_ch0>;
> + };
> + };
> + };
> +
> + channel at 1 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + reg = <1>;
> + phys = <&mipi_lvds_0_phy>;
> + phy-names = "lvds_phy";
> +
> + port at 0 {
> + reg = <0>;
> +
> + mipi_lvds_0_ldb_ch1_mipi_lvds_0_pxl2dpi: endpoint {
> + remote-endpoint = <&mipi_lvds_0_pxl2dpi_mipi_lvds_0_ldb_ch1>;
> + };
> + };
> + };
> + };
> --
> 2.7.4
>
> ------------------------------
>
> Subject: Digest Footer
>
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> dri-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
> ------------------------------
>
> End of dri-devel Digest, Vol 132, Issue 196
> *******************************************
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