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authorSylwester Nawrocki <s.nawrocki@samsung.com>2015-01-16 18:30:37 +0100
committerKishon Vijay Abraham I <kishon@ti.com>2015-01-30 16:06:48 +0530
commite4b3d38088df6f3acd40259c8ec32c9bd3bfe3da (patch)
treeb95d215c79ce0d6d620155ca3f38f729c6a5cbfd /drivers/phy
parent64d11406de2eac7330d8905ac064d62befe5a0b0 (diff)
downloadlinux-e4b3d38088df6f3acd40259c8ec32c9bd3bfe3da.tar.bz2
phy: exynos-video-mipi: Fix regression by adding support for PMU regmap
After the Exynos Power Management Unit (PMU) driver was converted to the platform device driver in commit 14fc8b93d47323561edf5d482 ("ARM: EXYNOS: Add platform driver support for Exynos PMU") and then PMU device nodes added to Exynos4 DTs in commit 7b9613aca42a5522d269 ("ARM: dts: add PMU syscon node for exynos4") the mipi video phy driver started failing probing, due to overlapping memory mapped register region resources. Now all the Exynos peripheral devices which have registers in the PMU region are supposed to use the regmap provided by the syscon driver. So support for regmap is added in this patch, this unfortunately creates yet another indirection into that supposedly trivial driver. The additional mutex is required because single register is used by PHY pairs (they share bit in a register). An improvement here could be to allow a PHY instance be created with a driver custom mutex, which would then be common for each PHY pair. This would eliminate one of 3 mutexes which need to be taken in the phy_power_on/ phy_power_off code path. However, I tried to keep this bug fix patch possibly simple. This change is needed to make MIPI DSI displays and MIPI CSI-2 camera sensors working again on Exynos4 boards. Cc: Pankaj Dubey <pankaj.dubey@samsung.com> Cc: Kukjin Kim <kgene.kim@samsung.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/phy-exynos-mipi-video.c89
1 files changed, 57 insertions, 32 deletions
diff --git a/drivers/phy/phy-exynos-mipi-video.c b/drivers/phy/phy-exynos-mipi-video.c
index 943e0f88a120..f017b2f2a54e 100644
--- a/drivers/phy/phy-exynos-mipi-video.c
+++ b/drivers/phy/phy-exynos-mipi-video.c
@@ -12,19 +12,18 @@
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
+#include <linux/mfd/syscon/exynos4-pmu.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
+#include <linux/regmap.h>
#include <linux/spinlock.h>
+#include <linux/mfd/syscon.h>
-/* MIPI_PHYn_CONTROL register offset: n = 0..1 */
+/* MIPI_PHYn_CONTROL reg. offset (for base address from ioremap): n = 0..1 */
#define EXYNOS_MIPI_PHY_CONTROL(n) ((n) * 4)
-#define EXYNOS_MIPI_PHY_ENABLE (1 << 0)
-#define EXYNOS_MIPI_PHY_SRESETN (1 << 1)
-#define EXYNOS_MIPI_PHY_MRESETN (1 << 2)
-#define EXYNOS_MIPI_PHY_RESET_MASK (3 << 1)
enum exynos_mipi_phy_id {
EXYNOS_MIPI_PHY_ID_CSIS0,
@@ -38,43 +37,62 @@ enum exynos_mipi_phy_id {
((id) == EXYNOS_MIPI_PHY_ID_DSIM0 || (id) == EXYNOS_MIPI_PHY_ID_DSIM1)
struct exynos_mipi_video_phy {
- spinlock_t slock;
struct video_phy_desc {
struct phy *phy;
unsigned int index;
} phys[EXYNOS_MIPI_PHYS_NUM];
+ spinlock_t slock;
void __iomem *regs;
+ struct mutex mutex;
+ struct regmap *regmap;
};
static int __set_phy_state(struct exynos_mipi_video_phy *state,
enum exynos_mipi_phy_id id, unsigned int on)
{
+ const unsigned int offset = EXYNOS4_MIPI_PHY_CONTROL(id / 2);
void __iomem *addr;
- u32 reg, reset;
-
- addr = state->regs + EXYNOS_MIPI_PHY_CONTROL(id / 2);
+ u32 val, reset;
if (is_mipi_dsim_phy_id(id))
- reset = EXYNOS_MIPI_PHY_MRESETN;
- else
- reset = EXYNOS_MIPI_PHY_SRESETN;
-
- spin_lock(&state->slock);
- reg = readl(addr);
- if (on)
- reg |= reset;
+ reset = EXYNOS4_MIPI_PHY_MRESETN;
else
- reg &= ~reset;
- writel(reg, addr);
-
- /* Clear ENABLE bit only if MRESETN, SRESETN bits are not set. */
- if (on)
- reg |= EXYNOS_MIPI_PHY_ENABLE;
- else if (!(reg & EXYNOS_MIPI_PHY_RESET_MASK))
- reg &= ~EXYNOS_MIPI_PHY_ENABLE;
+ reset = EXYNOS4_MIPI_PHY_SRESETN;
+
+ if (state->regmap) {
+ mutex_lock(&state->mutex);
+ regmap_read(state->regmap, offset, &val);
+ if (on)
+ val |= reset;
+ else
+ val &= ~reset;
+ regmap_write(state->regmap, offset, val);
+ if (on)
+ val |= EXYNOS4_MIPI_PHY_ENABLE;
+ else if (!(val & EXYNOS4_MIPI_PHY_RESET_MASK))
+ val &= ~EXYNOS4_MIPI_PHY_ENABLE;
+ regmap_write(state->regmap, offset, val);
+ mutex_unlock(&state->mutex);
+ } else {
+ addr = state->regs + EXYNOS_MIPI_PHY_CONTROL(id / 2);
+
+ spin_lock(&state->slock);
+ val = readl(addr);
+ if (on)
+ val |= reset;
+ else
+ val &= ~reset;
+ writel(val, addr);
+ /* Clear ENABLE bit only if MRESETN, SRESETN bits are not set */
+ if (on)
+ val |= EXYNOS4_MIPI_PHY_ENABLE;
+ else if (!(val & EXYNOS4_MIPI_PHY_RESET_MASK))
+ val &= ~EXYNOS4_MIPI_PHY_ENABLE;
+
+ writel(val, addr);
+ spin_unlock(&state->slock);
+ }
- writel(reg, addr);
- spin_unlock(&state->slock);
return 0;
}
@@ -118,7 +136,6 @@ static int exynos_mipi_video_phy_probe(struct platform_device *pdev)
{
struct exynos_mipi_video_phy *state;
struct device *dev = &pdev->dev;
- struct resource *res;
struct phy_provider *phy_provider;
unsigned int i;
@@ -126,14 +143,22 @@ static int exynos_mipi_video_phy_probe(struct platform_device *pdev)
if (!state)
return -ENOMEM;
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ state->regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
+ if (IS_ERR(state->regmap)) {
+ struct resource *res;
- state->regs = devm_ioremap_resource(dev, res);
- if (IS_ERR(state->regs))
- return PTR_ERR(state->regs);
+ dev_info(dev, "regmap lookup failed: %ld\n",
+ PTR_ERR(state->regmap));
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ state->regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(state->regs))
+ return PTR_ERR(state->regs);
+ }
dev_set_drvdata(dev, state);
spin_lock_init(&state->slock);
+ mutex_init(&state->mutex);
for (i = 0; i < EXYNOS_MIPI_PHYS_NUM; i++) {
struct phy *phy = devm_phy_create(dev, NULL,