[PATCH v2 0/7] drm: rcar-du: Misc patches
Tomi Valkeinen
tomi.valkeinen+renesas at ideasonboard.com
Fri Jan 20 08:50:02 UTC 2023
From: Tomi Valkeinen <tomi.valkeinen at ideasonboard.com>
Hi,
v2 of the series. Diff to v1 can be found below.
The main changes are:
- Runtime PM support for LVDS
- Skip rcar_du_group_setup() for gen4+
Tomi
Koji Matsuoka (1):
drm: rcar-du: lvds: Fix stop sequence
Tomi Valkeinen (6):
drm: rcar-du: dsi: add 'select RESET_CONTROLLER'
drm: rcar-du: lvds: Add runtime PM
drm: rcar-du: lvsd: Add reset control
drm: rcar-du: Add quirk for H3 ES1.x pclk workaround
drm: rcar-du: Fix setting a reserved bit in DPLLCR
drm: rcar-du: Stop accessing non-existant registers on gen4
drivers/gpu/drm/rcar-du/Kconfig | 2 +
drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 39 +++++++----
drivers/gpu/drm/rcar-du/rcar_du_drv.c | 49 ++++++++++++++
drivers/gpu/drm/rcar-du/rcar_du_drv.h | 2 +
drivers/gpu/drm/rcar-du/rcar_du_group.c | 11 +++-
drivers/gpu/drm/rcar-du/rcar_du_regs.h | 8 +--
drivers/gpu/drm/rcar-du/rcar_lvds.c | 86 +++++++++++++++++++++++--
7 files changed, 169 insertions(+), 28 deletions(-)
Interdiff against v1:
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index 56b23333993c..008e172ed43b 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -249,15 +249,24 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
dpllcr |= DPLLCR_PLCS1
| DPLLCR_INCS_DOTCLKIN1;
} else {
- dpllcr |= DPLLCR_PLCS0
+ dpllcr |= DPLLCR_PLCS0_PLL
| DPLLCR_INCS_DOTCLKIN0;
+
/*
- * On H3 ES1.x, in addition to setting bit 21 (PLCS0),
- * also bit 20 has to be set to select PLL1 as the
- * clock source.
+ * On ES2.x we have a single mux controlled via bit 21,
+ * which selects between DCLKIN source (bit 21 = 0) and
+ * a PLL source (bit 21 = 1), where the PLL is always
+ * PLL1.
+ *
+ * On ES1.x we have an additional mux, controlled
+ * via bit 20, for choosing between PLL0 (bit 20 = 0)
+ * and PLL1 (bit 20 = 1). We always want to use PLL1,
+ * so on ES1.x, in addition to setting bit 21, we need
+ * to set the bit 20.
*/
+
if (rcdu->info->quirks & RCAR_DU_QUIRK_H3_ES1_PLL)
- dpllcr |= DPLLCR_PLCS0_H3ES1X_PLL1_SEL;
+ dpllcr |= DPLLCR_PLCS0_H3ES1X_PLL1;
}
rcar_du_group_write(rcrtc->group, DPLLCR, dpllcr);
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
index d689f2510081..82f9718ff500 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
@@ -710,10 +710,10 @@ static void rcar_du_shutdown(struct platform_device *pdev)
static int rcar_du_probe(struct platform_device *pdev)
{
+ const struct soc_device_attribute *soc_attr;
struct rcar_du_device *rcdu;
unsigned int mask;
int ret;
- const struct soc_device_attribute *soc_attr;
if (drm_firmware_drivers_only())
return -ENODEV;
@@ -726,13 +726,12 @@ static int rcar_du_probe(struct platform_device *pdev)
rcdu->dev = &pdev->dev;
+ rcdu->info = of_device_get_match_data(rcdu->dev);
+
soc_attr = soc_device_match(rcar_du_soc_table);
if (soc_attr)
rcdu->info = soc_attr->data;
- if (!rcdu->info)
- rcdu->info = of_device_get_match_data(rcdu->dev);
-
platform_set_drvdata(pdev, rcdu);
/* I/O resources */
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_group.c b/drivers/gpu/drm/rcar-du/rcar_du_group.c
index c236e2aa8a01..c2209d427bb7 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_group.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_group.c
@@ -194,10 +194,13 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp)
*/
int rcar_du_group_get(struct rcar_du_group *rgrp)
{
+ struct rcar_du_device *rcdu = rgrp->dev;
+
if (rgrp->use_count)
goto done;
- rcar_du_group_setup(rgrp);
+ if (rcdu->info->gen < 4)
+ rcar_du_group_setup(rgrp);
done:
rgrp->use_count++;
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_regs.h b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
index 94d913f66c8f..789ae9285108 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_regs.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
@@ -283,13 +283,8 @@
#define DPLLCR 0x20044
#define DPLLCR_CODE (0x95 << 24)
#define DPLLCR_PLCS1 (1 << 23)
-/*
- * PLCS0 is bit 21, but H3 ES1.x requires bit 20 to be set as well. As bit 20
- * isn't implemented by other SoC in the Gen3 family it can safely be set
- * unconditionally.
- */
-#define DPLLCR_PLCS0 (1 << 21)
-#define DPLLCR_PLCS0_H3ES1X_PLL1_SEL (1 << 20)
+#define DPLLCR_PLCS0_PLL (1 << 21)
+#define DPLLCR_PLCS0_H3ES1X_PLL1 (1 << 20)
#define DPLLCR_CLKE (1 << 18)
#define DPLLCR_FDPLL(n) ((n) << 12)
#define DPLLCR_N(n) ((n) << 5)
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index 01800cef1c33..8fa5f7400179 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -16,6 +16,7 @@
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
@@ -82,14 +83,14 @@ struct rcar_lvds {
#define bridge_to_rcar_lvds(b) \
container_of(b, struct rcar_lvds, bridge)
-static void rcar_lvds_write(struct rcar_lvds *lvds, u32 reg, u32 data)
+static u32 rcar_lvds_read(struct rcar_lvds *lvds, u32 reg)
{
- iowrite32(data, lvds->mmio + reg);
+ return ioread32(lvds->mmio + reg);
}
-static u32 rcar_lvds_read(struct rcar_lvds *lvds, u32 reg)
+static void rcar_lvds_write(struct rcar_lvds *lvds, u32 reg, u32 data)
{
- return ioread32(lvds->mmio + reg);
+ iowrite32(data, lvds->mmio + reg);
}
/* -----------------------------------------------------------------------------
@@ -323,10 +324,8 @@ int rcar_lvds_pclk_enable(struct drm_bridge *bridge, unsigned long freq)
dev_dbg(lvds->dev, "enabling LVDS PLL, freq=%luHz\n", freq);
- reset_control_deassert(lvds->rstc);
-
- ret = clk_prepare_enable(lvds->clocks.mod);
- if (ret < 0)
+ ret = pm_runtime_resume_and_get(lvds->dev);
+ if (ret)
return ret;
__rcar_lvds_pll_setup_d3_e3(lvds, freq, true);
@@ -346,9 +345,7 @@ void rcar_lvds_pclk_disable(struct drm_bridge *bridge)
rcar_lvds_write(lvds, LVDPLLCR, 0);
- clk_disable_unprepare(lvds->clocks.mod);
-
- reset_control_assert(lvds->rstc);
+ pm_runtime_put(lvds->dev);
}
EXPORT_SYMBOL_GPL(rcar_lvds_pclk_disable);
@@ -407,10 +404,8 @@ static void __rcar_lvds_atomic_enable(struct drm_bridge *bridge,
u32 lvdcr0;
int ret;
- reset_control_deassert(lvds->rstc);
-
- ret = clk_prepare_enable(lvds->clocks.mod);
- if (ret < 0)
+ ret = pm_runtime_resume_and_get(lvds->dev);
+ if (ret)
return;
/* Enable the companion LVDS encoder in dual-link mode. */
@@ -576,6 +571,7 @@ static void rcar_lvds_atomic_disable(struct drm_bridge *bridge,
rcar_lvds_write(lvds, LVDCR0, lvdcr0);
}
+ rcar_lvds_write(lvds, LVDCR0, 0);
rcar_lvds_write(lvds, LVDCR1, 0);
rcar_lvds_write(lvds, LVDPLLCR, 0);
@@ -584,8 +580,7 @@ static void rcar_lvds_atomic_disable(struct drm_bridge *bridge,
lvds->companion->funcs->atomic_disable(lvds->companion,
old_bridge_state);
- clk_disable_unprepare(lvds->clocks.mod);
- reset_control_assert(lvds->rstc);
+ pm_runtime_put(lvds->dev);
}
static bool rcar_lvds_mode_fixup(struct drm_bridge *bridge,
@@ -878,11 +873,11 @@ static int rcar_lvds_probe(struct platform_device *pdev)
if (ret < 0)
return ret;
- lvds->rstc = devm_reset_control_get(&pdev->dev, NULL);
- if (IS_ERR(lvds->rstc)) {
- dev_err(&pdev->dev, "failed to get cpg reset\n");
- return PTR_ERR(lvds->rstc);
- }
+ lvds->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+ if (IS_ERR(lvds->rstc))
+ return dev_err_probe(&pdev->dev, PTR_ERR(lvds->rstc),
+ "failed to get cpg reset\n");
+ pm_runtime_enable(&pdev->dev);
drm_bridge_add(&lvds->bridge);
@@ -895,6 +890,8 @@ static int rcar_lvds_remove(struct platform_device *pdev)
drm_bridge_remove(&lvds->bridge);
+ pm_runtime_disable(&pdev->dev);
+
return 0;
}
@@ -953,11 +950,48 @@ static const struct of_device_id rcar_lvds_of_table[] = {
MODULE_DEVICE_TABLE(of, rcar_lvds_of_table);
+static int rcar_lvds_runtime_suspend(struct device *dev)
+{
+ struct rcar_lvds *lvds = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(lvds->clocks.mod);
+
+ reset_control_assert(lvds->rstc);
+
+ return 0;
+}
+
+static int rcar_lvds_runtime_resume(struct device *dev)
+{
+ struct rcar_lvds *lvds = dev_get_drvdata(dev);
+ int ret;
+
+ ret = reset_control_deassert(lvds->rstc);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(lvds->clocks.mod);
+ if (ret < 0)
+ goto err_reset_assert;
+
+ return 0;
+
+err_reset_assert:
+ reset_control_assert(lvds->rstc);
+
+ return ret;
+}
+
+static const struct dev_pm_ops rcar_lvds_pm_ops = {
+ SET_RUNTIME_PM_OPS(rcar_lvds_runtime_suspend, rcar_lvds_runtime_resume, NULL)
+};
+
static struct platform_driver rcar_lvds_platform_driver = {
.probe = rcar_lvds_probe,
.remove = rcar_lvds_remove,
.driver = {
.name = "rcar-lvds",
+ .pm = &rcar_lvds_pm_ops,
.of_match_table = rcar_lvds_of_table,
},
};
--
2.34.1
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