[PATCH 13/17] drm/imx: imx-ldb: split imx_ldb devres allocation context
Marco Felsch
m.felsch at pengutronix.de
Thu Feb 27 16:21:21 UTC 2020
This patch prepares the driver for a overall 'make drm/imx
drm_mode_config_cleanup() aware' patch to avoid race conditions like
[1]. The patch also improves the driver memory usage by allocating only
the necessary number of 'struct imx_ldb_channel'.
To make the driver drm_mode_config_cleanup() aware we need to split the
driver state 'struct imx_ldb'. All the hardware settings like clocks and
the regmap can be allocated during the driver probe() and so the devres
context is moved to the probe/remove.
Now upon a component.bind() call only the necessary number of channels
are allocated. The difference is that now the 'struct imx_ldb_channel'
memory is allocated within the bind/unbind devres context.
So now the 'struct imx_ldb' driver state is still available after a
component.unbind() call.
[1] https://www.spinics.net/lists/dri-devel/msg189388.html
Signed-off-by: Marco Felsch <m.felsch at pengutronix.de>
---
drivers/gpu/drm/imx/imx-ldb.c | 187 ++++++++++++++++++----------------
1 file changed, 98 insertions(+), 89 deletions(-)
diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index 87bf659990da..e3fa46e1639d 100644
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -87,7 +87,6 @@ struct bus_mux {
struct imx_ldb {
struct regmap *regmap;
struct device *dev;
- struct imx_ldb_channel channel[2];
struct clk *clk[2]; /* our own clock */
struct clk *clk_sel[4]; /* parent of display clock */
struct clk *clk_parent[4]; /* original parent of clk_sel */
@@ -212,14 +211,14 @@ static void imx_ldb_encoder_enable(struct drm_encoder *encoder)
clk_set_parent(ldb->clk_sel[mux], ldb->clk[imx_ldb_ch->chno]);
}
- if (imx_ldb_ch == &ldb->channel[0] || dual) {
+ if (imx_ldb_ch->chno == 0 || dual) {
ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
if (mux == 0 || ldb->lvds_mux)
ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
else if (mux == 1)
ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
}
- if (imx_ldb_ch == &ldb->channel[1] || dual) {
+ if (imx_ldb_ch->chno == 1 || dual) {
ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
if (mux == 1 || ldb->lvds_mux)
ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
@@ -230,9 +229,9 @@ static void imx_ldb_encoder_enable(struct drm_encoder *encoder)
if (ldb->lvds_mux) {
const struct bus_mux *lvds_mux = NULL;
- if (imx_ldb_ch == &ldb->channel[0])
+ if (imx_ldb_ch->chno == 0)
lvds_mux = &ldb->lvds_mux[0];
- else if (imx_ldb_ch == &ldb->channel[1])
+ else if (imx_ldb_ch->chno == 1)
lvds_mux = &ldb->lvds_mux[1];
regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
@@ -278,13 +277,13 @@ imx_ldb_encoder_atomic_mode_set(struct drm_encoder *encoder,
}
/* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
- if (imx_ldb_ch == &ldb->channel[0] || dual) {
+ if (imx_ldb_ch->chno == 0 || dual) {
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
}
- if (imx_ldb_ch == &ldb->channel[1] || dual) {
+ if (imx_ldb_ch->chno == 1 || dual) {
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
@@ -309,9 +308,9 @@ static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
drm_panel_disable(imx_ldb_ch->panel);
- if (imx_ldb_ch == &ldb->channel[0])
+ if (imx_ldb_ch->chno == 0)
ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
- else if (imx_ldb_ch == &ldb->channel[1])
+ else if (imx_ldb_ch->chno == 1)
ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
@@ -324,16 +323,16 @@ static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
if (ldb->lvds_mux) {
const struct bus_mux *lvds_mux = NULL;
- if (imx_ldb_ch == &ldb->channel[0])
+ if (imx_ldb_ch->chno == 0)
lvds_mux = &ldb->lvds_mux[0];
- else if (imx_ldb_ch == &ldb->channel[1])
+ else if (imx_ldb_ch->chno == 1)
lvds_mux = &ldb->lvds_mux[1];
regmap_read(ldb->regmap, lvds_mux->reg, &mux);
mux &= lvds_mux->mask;
mux >>= lvds_mux->shift;
} else {
- mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
+ mux = imx_ldb_ch->chno;
}
/* set display clock mux back to original input clock */
@@ -513,31 +512,6 @@ static u32 of_get_bus_format(struct device *dev, struct device_node *np)
return -ENOENT;
}
-static struct bus_mux imx6q_lvds_mux[2] = {
- {
- .reg = IOMUXC_GPR3,
- .shift = 6,
- .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
- }, {
- .reg = IOMUXC_GPR3,
- .shift = 8,
- .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
- }
-};
-
-/*
- * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
- * of_match_device will walk through this list and take the first entry
- * matching any of its compatible values. Therefore, the more generic
- * entries (in this case fsl,imx53-ldb) need to be ordered last.
- */
-static const struct of_device_id imx_ldb_dt_ids[] = {
- { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
- { .compatible = "fsl,imx53-ldb", .data = NULL, },
- { }
-};
-MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
-
static int imx_ldb_panel_ddc(struct device *dev,
struct imx_ldb_channel *channel, struct device_node *child)
{
@@ -582,59 +556,12 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
{
struct drm_device *drm = data;
struct device_node *np = dev->of_node;
- const struct of_device_id *of_id =
- of_match_device(imx_ldb_dt_ids, dev);
+ struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
+ int dual = imx_ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
struct device_node *child;
- struct imx_ldb *imx_ldb;
- int dual;
int ret;
int i;
- imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
- if (!imx_ldb)
- return -ENOMEM;
-
- imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
- if (IS_ERR(imx_ldb->regmap)) {
- dev_err(dev, "failed to get parent regmap\n");
- return PTR_ERR(imx_ldb->regmap);
- }
-
- /* disable LDB by resetting the control register to POR default */
- regmap_write(imx_ldb->regmap, IOMUXC_GPR2, 0);
-
- imx_ldb->dev = dev;
-
- if (of_id)
- imx_ldb->lvds_mux = of_id->data;
-
- dual = of_property_read_bool(np, "fsl,dual-channel");
- if (dual)
- imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
-
- /*
- * There are three different possible clock mux configurations:
- * i.MX53: ipu1_di0_sel, ipu1_di1_sel
- * i.MX6q: ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
- * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
- * Map them all to di0_sel...di3_sel.
- */
- for (i = 0; i < 4; i++) {
- char clkname[16];
-
- sprintf(clkname, "di%d_sel", i);
- imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
- if (IS_ERR(imx_ldb->clk_sel[i])) {
- ret = PTR_ERR(imx_ldb->clk_sel[i]);
- imx_ldb->clk_sel[i] = NULL;
- break;
- }
-
- imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
- }
- if (i == 0)
- return ret;
-
for_each_child_of_node(np, child) {
struct imx_ldb_channel *channel;
int bus_format;
@@ -653,7 +580,10 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
continue;
}
- channel = &imx_ldb->channel[i];
+ channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
+ if (!channel)
+ return -ENOMEM;
+
channel->ldb = imx_ldb;
channel->chno = i;
@@ -700,8 +630,6 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
}
}
- dev_set_drvdata(dev, imx_ldb);
-
return 0;
free_child:
@@ -713,8 +641,89 @@ static const struct component_ops imx_ldb_ops = {
.bind = imx_ldb_bind,
};
+static struct bus_mux imx6q_lvds_mux[2] = {
+ {
+ .reg = IOMUXC_GPR3,
+ .shift = 6,
+ .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
+ }, {
+ .reg = IOMUXC_GPR3,
+ .shift = 8,
+ .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
+ }
+};
+
+/*
+ * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
+ * of_match_device will walk through this list and take the first entry
+ * matching any of its compatible values. Therefore, the more generic
+ * entries (in this case fsl,imx53-ldb) need to be ordered last.
+ */
+static const struct of_device_id imx_ldb_dt_ids[] = {
+ { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
+ { .compatible = "fsl,imx53-ldb", .data = NULL, },
+ { }
+};
+MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
+
static int imx_ldb_probe(struct platform_device *pdev)
{
+ struct device *dev = &pdev->dev;
+ const struct of_device_id *of_id =
+ of_match_device(imx_ldb_dt_ids, dev);
+ struct device_node *np = dev->of_node;
+ struct imx_ldb *imx_ldb;
+ int dual;
+ int ret;
+ int i;
+
+ imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
+ if (!imx_ldb)
+ return -ENOMEM;
+
+ imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
+ if (IS_ERR(imx_ldb->regmap)) {
+ dev_err(dev, "failed to get parent regmap\n");
+ return PTR_ERR(imx_ldb->regmap);
+ }
+
+ /* disable LDB by resetting the control register to POR default */
+ regmap_write(imx_ldb->regmap, IOMUXC_GPR2, 0);
+
+ imx_ldb->dev = dev;
+
+ if (of_id)
+ imx_ldb->lvds_mux = of_id->data;
+
+ dual = of_property_read_bool(np, "fsl,dual-channel");
+ if (dual)
+ imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
+
+ /*
+ * There are three different possible clock mux configurations:
+ * i.MX53: ipu1_di0_sel, ipu1_di1_sel
+ * i.MX6q: ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
+ * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
+ * Map them all to di0_sel...di3_sel.
+ */
+ for (i = 0; i < 4; i++) {
+ char clkname[16];
+
+ sprintf(clkname, "di%d_sel", i);
+ imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
+ if (IS_ERR(imx_ldb->clk_sel[i])) {
+ ret = PTR_ERR(imx_ldb->clk_sel[i]);
+ imx_ldb->clk_sel[i] = NULL;
+ break;
+ }
+
+ imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
+ }
+ if (i == 0)
+ return ret;
+
+ dev_set_drvdata(dev, imx_ldb);
+
return component_add(&pdev->dev, &imx_ldb_ops);
}
--
2.20.1
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