* [PATCH] [media] omap4iss: avoid broken OMAP4 dependency
2015-04-10 20:20 [PATCH] [media] omap4iss: avoid broken OMAP4 dependency Arnd Bergmann
@ 2015-04-12 12:22 ` Laurent Pinchart
2015-04-12 12:28 ` [PATCH] v4l: omap4iss: Replace outdated OMAP4 control pad API with syscon Laurent Pinchart
1 sibling, 0 replies; 6+ messages in thread
From: Laurent Pinchart @ 2015-04-12 12:22 UTC (permalink / raw)
To: linux-arm-kernel
Hi Arnd,
Thank you for the patch.
On Friday 10 April 2015 22:20:20 Arnd Bergmann wrote:
> The omap4iss driver uses an interface that used to be provided
> by OMAP4 but has now been removed and replaced with a WARN_ON(1)
> statement, which likely broke the iss_csiphy code at runtime.
>
> It also broke compiling the driver when CONFIG_ARCH_OMAP2PLUS
> is set, which is implied by OMAP4:
>
> drivers/staging/media/omap4iss/iss_csiphy.c: In function
> 'omap4iss_csiphy_config':
> drivers/staging/media/omap4iss/iss_csiphy.c:167:2: error: implicit
> declaration of function 'omap4_ctrl_pad_writel'
> [-Werror=implicit-function-declaration] omap4_ctrl_pad_writel(cam_rx_ctrl,
>
> In turn, this broke ARM allyesconfig builds. Replacing the
> omap4_ctrl_pad_writel call with WARN_ON(1) won't make the
> situation any worse than it already is, but fixes the build
> problem.
I've fixed the problem properly by switching to the syscon API. I'll send the
patch as a separate reply, let's discuss there how to handle the issue.
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Fixes: efde234674d9 ("ARM: OMAP4+: control: remove support for legacy pad
> read/write")
> ---
> diff --git a/drivers/staging/media/omap4iss/iss_csiphy.c
> b/drivers/staging/media/omap4iss/iss_csiphy.c index
> 7c3d55d811ef..24f56ed90ac3 100644
> --- a/drivers/staging/media/omap4iss/iss_csiphy.c
> +++ b/drivers/staging/media/omap4iss/iss_csiphy.c
>
> @@ -140,9 +140,7 @@ int omap4iss_csiphy_config(struct iss_device *iss,
> * - bit [18] : CSIPHY1 CTRLCLK enable
> * - bit [17:16] : CSIPHY1 config: 00 d-phy, 01/10 ccp2
> */
> - cam_rx_ctrl = omap4_ctrl_pad_readl(
> - OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_CAMERA_RX);
> -
> + cam_rx_ctrl = WARN_ON(1);
>
> if (subdevs->interface == ISS_INTERFACE_CSI2A_PHY1) {
> cam_rx_ctrl &= ~(OMAP4_CAMERARX_CSI21_LANEENABLE_MASK |
> @@ -166,8 +164,7 @@ int omap4iss_csiphy_config(struct iss_device *iss,
> cam_rx_ctrl |= OMAP4_CAMERARX_CSI22_CTRLCLKEN_MASK;
> }
>
> - omap4_ctrl_pad_writel(cam_rx_ctrl,
> - OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_CAMERA_RX);
> + WARN_ON(1);
>
> /* Reset used lane count */
> csi2->phy->used_data_lanes = 0;
--
Regards,
Laurent Pinchart
^ permalink raw reply [flat|nested] 6+ messages in thread* [PATCH] v4l: omap4iss: Replace outdated OMAP4 control pad API with syscon
2015-04-10 20:20 [PATCH] [media] omap4iss: avoid broken OMAP4 dependency Arnd Bergmann
2015-04-12 12:22 ` Laurent Pinchart
@ 2015-04-12 12:28 ` Laurent Pinchart
2015-04-12 14:31 ` Sakari Ailus
2015-04-12 20:04 ` Arnd Bergmann
1 sibling, 2 replies; 6+ messages in thread
From: Laurent Pinchart @ 2015-04-12 12:28 UTC (permalink / raw)
To: linux-arm-kernel
The omap4_ctrl_pad_readl and omap4_ctrl_pad_writel functions have been
removed by commit efde234674d9 ("ARM: OMAP4+: control: remove support
for legacy pad read/write") but are still used by the OMAP4 ISS driver,
resulting in a compilation breakage:
drivers/staging/media/omap4iss/iss_csiphy.c: In function 'omap4iss_csiphy_config':
drivers/staging/media/omap4iss/iss_csiphy.c:167:2: error: implicit declaration of function 'omap4_ctrl_pad_writel' [-Werror=implicit-function-declaration]
omap4_ctrl_pad_writel(cam_rx_ctrl,
Fix the problem by using the syscon API to reaplace the control pad API.
Lookup the syscon instance by compatible name for now as the OMAP4 ISS
driver doesn't support DT yet.
Fixes: efde234674d9 ("ARM: OMAP4+: control: remove support for legacy pad read/write")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
drivers/staging/media/omap4iss/Kconfig | 1 +
drivers/staging/media/omap4iss/iss.c | 11 +++++++++++
drivers/staging/media/omap4iss/iss.h | 4 ++++
drivers/staging/media/omap4iss/iss_csiphy.c | 12 +++++++-----
4 files changed, 23 insertions(+), 5 deletions(-)
Hi Arnd,
This patch doesn't depend nor conflict with the OMAP4 ISS patches scheduled to
be merged in v4.1. If Mauro is fine with that, and if it makes your life
easier, it could get merged through the arm-soc tree. Please let me know what
you prefer.
diff --git a/drivers/staging/media/omap4iss/Kconfig b/drivers/staging/media/omap4iss/Kconfig
index b78643f..072dac0 100644
--- a/drivers/staging/media/omap4iss/Kconfig
+++ b/drivers/staging/media/omap4iss/Kconfig
@@ -2,6 +2,7 @@ config VIDEO_OMAP4
bool "OMAP 4 Camera support"
depends on VIDEO_V4L2=y && VIDEO_V4L2_SUBDEV_API && I2C=y && ARCH_OMAP4
depends on HAS_DMA
+ select MFD_SYSCON
select VIDEOBUF2_DMA_CONTIG
---help---
Driver for an OMAP 4 ISS controller.
diff --git a/drivers/staging/media/omap4iss/iss.c b/drivers/staging/media/omap4iss/iss.c
index 44b81a2..cf22dd2 100644
--- a/drivers/staging/media/omap4iss/iss.c
+++ b/drivers/staging/media/omap4iss/iss.c
@@ -17,6 +17,7 @@
#include <linux/dma-mapping.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
+#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -1386,6 +1387,16 @@ static int iss_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, iss);
+ /*
+ * TODO: When implementing DT support switch to syscon regmap lookup by
+ * phandle.
+ */
+ iss->syscon = syscon_regmap_lookup_by_compatible("syscon");
+ if (IS_ERR(iss->syscon)) {
+ ret = PTR_ERR(iss->syscon);
+ goto error;
+ }
+
/* Clocks */
ret = iss_map_mem_resource(pdev, iss, OMAP4_ISS_MEM_TOP);
if (ret < 0)
diff --git a/drivers/staging/media/omap4iss/iss.h b/drivers/staging/media/omap4iss/iss.h
index 734cfee..35df8b4 100644
--- a/drivers/staging/media/omap4iss/iss.h
+++ b/drivers/staging/media/omap4iss/iss.h
@@ -29,6 +29,8 @@
#include "iss_ipipe.h"
#include "iss_resizer.h"
+struct regmap;
+
#define to_iss_device(ptr_module) \
container_of(ptr_module, struct iss_device, ptr_module)
#define to_device(ptr_module) \
@@ -79,6 +81,7 @@ struct iss_reg {
/*
* struct iss_device - ISS device structure.
+ * @syscon: Regmap for the syscon register space
* @crashed: Bitmask of crashed entities (indexed by entity ID)
*/
struct iss_device {
@@ -93,6 +96,7 @@ struct iss_device {
struct resource *res[OMAP4_ISS_MEM_LAST];
void __iomem *regs[OMAP4_ISS_MEM_LAST];
+ struct regmap *syscon;
u64 raw_dmamask;
diff --git a/drivers/staging/media/omap4iss/iss_csiphy.c b/drivers/staging/media/omap4iss/iss_csiphy.c
index 7c3d55d..748607f 100644
--- a/drivers/staging/media/omap4iss/iss_csiphy.c
+++ b/drivers/staging/media/omap4iss/iss_csiphy.c
@@ -13,6 +13,7 @@
#include <linux/delay.h>
#include <linux/device.h>
+#include <linux/regmap.h>
#include "../../../../arch/arm/mach-omap2/control.h"
@@ -140,9 +141,11 @@ int omap4iss_csiphy_config(struct iss_device *iss,
* - bit [18] : CSIPHY1 CTRLCLK enable
* - bit [17:16] : CSIPHY1 config: 00 d-phy, 01/10 ccp2
*/
- cam_rx_ctrl = omap4_ctrl_pad_readl(
- OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_CAMERA_RX);
-
+ /*
+ * TODO: When implementing DT support specify the CONTROL_CAMERA_RX
+ * register offset in the syscon property instead of hardcoding it.
+ */
+ regmap_read(iss->syscon, 0x68, &cam_rx_ctrl);
if (subdevs->interface == ISS_INTERFACE_CSI2A_PHY1) {
cam_rx_ctrl &= ~(OMAP4_CAMERARX_CSI21_LANEENABLE_MASK |
@@ -166,8 +169,7 @@ int omap4iss_csiphy_config(struct iss_device *iss,
cam_rx_ctrl |= OMAP4_CAMERARX_CSI22_CTRLCLKEN_MASK;
}
- omap4_ctrl_pad_writel(cam_rx_ctrl,
- OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_CAMERA_RX);
+ regmap_write(iss->syscon, 0x68, cam_rx_ctrl);
/* Reset used lane count */
csi2->phy->used_data_lanes = 0;
--
Regards,
Laurent Pinchart
^ permalink raw reply related [flat|nested] 6+ messages in thread