[PATCH 1/5] imx-drm: imx-drm-core: Export imx_drm_encoder_get_mux_id

[PATCH 1/5] imx-drm: imx-drm-core: Export imx_drm_encoder_get_mux_id

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam@freescale.com>

When building imx_v6_v7_defconfig with imx-drm drivers selected as modules, we 
get the following build error:

ERROR: "imx_drm_encoder_get_mux_id" [drivers/staging/imx-drm/imx-ldb.ko] undefined!

Export the required function to avoid this problem.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
---
 drivers/staging/imx-drm/imx-drm-core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/imx-drm/imx-drm-core.c b/drivers/staging/imx-drm/imx-drm-core.c
index 9854a1d..6bc205b 100644
--- a/drivers/staging/imx-drm/imx-drm-core.c
+++ b/drivers/staging/imx-drm/imx-drm-core.c
@@ -678,6 +678,7 @@ found:
 
 	return i;
 }
+EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
 
 /*
  * imx_drm_remove_encoder - remove an encoder
-- 
1.8.1.2

[PATCH 2/5] imx-drm: ipu-dp: Check the return value of devm_kzalloc()

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam@freescale.com>

devm_kzalloc() may fail, so let's check its return value.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
---
 drivers/staging/imx-drm/ipu-v3/ipu-dp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
index 113b046..0449515 100644
--- a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
+++ b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
@@ -309,6 +309,8 @@ int ipu_dp_init(struct ipu_soc *ipu, struct device *dev, unsigned long base)
 	int i;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
 	priv->dev = dev;
 	priv->ipu = ipu;
 
-- 
1.8.1.2

[PATCH 3/5] imx-drm: ipu-dp: Remove unneeded braces

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam@freescale.com>

No need to have braces for a single line 'if' block

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
---
 drivers/staging/imx-drm/ipu-v3/ipu-dp.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
index 0449515..6e0e9f1 100644
--- a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
+++ b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
@@ -317,9 +317,8 @@ int ipu_dp_init(struct ipu_soc *ipu, struct device *dev, unsigned long base)
 	ipu->dp_priv = priv;
 
 	priv->base = devm_ioremap(dev, base, PAGE_SIZE);
-	if (!priv->base) {
+	if (!priv->base)
 		return -ENOMEM;
-	}
 
 	mutex_init(&priv->mutex);
 
-- 
1.8.1.2

[PATCH 4/5] imx-drm: ipu-dp: Introduce IPUV3_NUM_FLOWS

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam@freescale.com>

IPUv3 has a total of 3 flows (one synchronous flow and 2 asynchronous flows).

Let's add a definition for such number in order to let the code easier to
understand.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
---
 drivers/staging/imx-drm/ipu-v3/ipu-dp.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
index 6e0e9f1..3bdff6af 100644
--- a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
+++ b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
@@ -46,6 +46,8 @@
 #define DP_COM_CONF_CSC_DEF_BG		(2 << 8)
 #define DP_COM_CONF_CSC_DEF_BOTH	(1 << 8)
 
+#define IPUV3_NUM_FLOWS		3
+
 struct ipu_dp_priv;
 
 struct ipu_dp {
@@ -67,7 +69,7 @@ struct ipu_dp_priv {
 	struct ipu_soc *ipu;
 	struct device *dev;
 	void __iomem *base;
-	struct ipu_flow flow[3];
+	struct ipu_flow flow[IPUV3_NUM_FLOWS];
 	struct mutex mutex;
 	int use_count;
 };
@@ -322,7 +324,7 @@ int ipu_dp_init(struct ipu_soc *ipu, struct device *dev, unsigned long base)
 
 	mutex_init(&priv->mutex);
 
-	for (i = 0; i < 3; i++) {
+	for (i = 0; i < IPUV3_NUM_FLOWS; i++) {
 		priv->flow[i].foreground.foreground = 1;
 		priv->flow[i].base = priv->base + ipu_dp_flow_base[i];
 		priv->flow[i].priv = priv;
-- 
1.8.1.2

[PATCH 5/5] imx-drm: ipu-dp: Adjust the maximum number of flows

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam@freescale.com>

Later in ipu_dp_get() the index of the flow array is calculated by:
flow >> 1

So adjust its maximum to IPUV3_NUM_FLOWS << 1.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
---
 drivers/staging/imx-drm/ipu-v3/ipu-dp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
index 3bdff6af..ae2c199 100644
--- a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
+++ b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
@@ -282,7 +282,7 @@ struct ipu_dp *ipu_dp_get(struct ipu_soc *ipu, unsigned int flow)
 	struct ipu_dp_priv *priv = ipu->dp_priv;
 	struct ipu_dp *dp;
 
-	if (flow > 5)
+	if (flow > IPUV3_NUM_FLOWS << 1)
 		return ERR_PTR(-EINVAL);
 
 	if (flow & 1)
-- 
1.8.1.2

Re: [PATCH 1/5] imx-drm: imx-drm-core: Export imx_drm_encoder_get_mux_id

[Uwe Kleine-König]

On Fri, Jun 28, 2013 at 12:32:01AM -0300, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.estevam@freescale.com>
> 
> When building imx_v6_v7_defconfig with imx-drm drivers selected as modules, we 
> get the following build error:
> 
> ERROR: "imx_drm_encoder_get_mux_id" [drivers/staging/imx-drm/imx-ldb.ko] undefined!
So imx-ldb.c needs a symbol from imx-drm-core.c right? The alternative
to exporting this symbol for a single user(?) is to link these two files
into a single module. Does this make sense? If yes, that would IMHO be
the better fix.

Best regards
Uwe
> 
> Export the required function to avoid this problem.
> 
> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
> ---
>  drivers/staging/imx-drm/imx-drm-core.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/staging/imx-drm/imx-drm-core.c b/drivers/staging/imx-drm/imx-drm-core.c
> index 9854a1d..6bc205b 100644
> --- a/drivers/staging/imx-drm/imx-drm-core.c
> +++ b/drivers/staging/imx-drm/imx-drm-core.c
> @@ -678,6 +678,7 @@ found:
>  
>  	return i;
>  }
> +EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
>  
>  /*
>   * imx_drm_remove_encoder - remove an encoder
> -- 
> 1.8.1.2
> 
> 

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH 5/5] imx-drm: ipu-dp: Adjust the maximum number of flows

[Uwe Kleine-König]

On Fri, Jun 28, 2013 at 12:32:05AM -0300, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.estevam@freescale.com>
> 
> Later in ipu_dp_get() the index of the flow array is calculated by:
> flow >> 1
> 
> So adjust its maximum to IPUV3_NUM_FLOWS << 1.
Maybe squash this into patch 4?

Uwe
> 
> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
> ---
>  drivers/staging/imx-drm/ipu-v3/ipu-dp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
> index 3bdff6af..ae2c199 100644
> --- a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
> +++ b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
> @@ -282,7 +282,7 @@ struct ipu_dp *ipu_dp_get(struct ipu_soc *ipu, unsigned int flow)
>  	struct ipu_dp_priv *priv = ipu->dp_priv;
>  	struct ipu_dp *dp;
>  
> -	if (flow > 5)
> +	if (flow > IPUV3_NUM_FLOWS << 1)
>  		return ERR_PTR(-EINVAL);
>  
>  	if (flow & 1)
> -- 
> 1.8.1.2
> 
> 

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH 5/5] imx-drm: ipu-dp: Adjust the maximum number of flows

[Fabio Estevam]

Hi Uwe,

On Fri, Jun 28, 2013 at 4:30 AM, Uwe Kleine-König
<u.kleine-koenig@pengutronix.de> wrote:
> On Fri, Jun 28, 2013 at 12:32:05AM -0300, Fabio Estevam wrote:
>> From: Fabio Estevam <fabio.estevam@freescale.com>
>>
>> Later in ipu_dp_get() the index of the flow array is calculated by:
>> flow >> 1
>>
>> So adjust its maximum to IPUV3_NUM_FLOWS << 1.
> Maybe squash this into patch 4?

Patch 4 is just cosmetic, but in this one I am changing the comparison from:
'if (flow > 5)' to 'if (flow > 6)'

,so that's why I splitted them.

I am OK with squashing the two patches together though.

Sascha,

Do you agree with the 'if (flow > 6)' change?

Thanks,

Fabio Estevam

Re: [PATCH 5/5] imx-drm: ipu-dp: Adjust the maximum number of flows

[Philipp Zabel]

Hi Fabio,

Am Freitag, den 28.06.2013, 00:32 -0300 schrieb Fabio Estevam:
> From: Fabio Estevam <fabio.estevam@freescale.com>
> 
> Later in ipu_dp_get() the index of the flow array is calculated by:
> flow >> 1
> 
> So adjust its maximum to IPUV3_NUM_FLOWS << 1.
> 
> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
> ---
>  drivers/staging/imx-drm/ipu-v3/ipu-dp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
> index 3bdff6af..ae2c199 100644
> --- a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
> +++ b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
> @@ -282,7 +282,7 @@ struct ipu_dp *ipu_dp_get(struct ipu_soc *ipu, unsigned int flow)
>  	struct ipu_dp_priv *priv = ipu->dp_priv;
>  	struct ipu_dp *dp;
>  
> -	if (flow > 5)
> +	if (flow > IPUV3_NUM_FLOWS << 1)

If (flow == IPUV3_NUM_FLOWS << 1), this will continue and try to access
&priv->flow[3] below, which is invalid. How about

+	if ((flow >> 1) >= IPUV3_NUM_FLOWS)

instead?

>  		return ERR_PTR(-EINVAL);
>  
>  	if (flow & 1)

regards
Philipp

Re: [PATCH 5/5] imx-drm: ipu-dp: Adjust the maximum number of flows

[Fabio Estevam]

Hi Philipp,

On Fri, Jun 28, 2013 at 10:53 AM, Philipp Zabel <p.zabel@pengutronix.de> wrote:

>
> If (flow == IPUV3_NUM_FLOWS << 1), this will continue and try to access
> &priv->flow[3] below, which is invalid. How about
>
> +       if ((flow >> 1) >= IPUV3_NUM_FLOWS)
>
> instead?

Yes, agreed.

Thanks,

Fabio Estevam

Re: [PATCH 1/5] imx-drm: imx-drm-core: Export imx_drm_encoder_get_mux_id

[Fabio Estevam]

Hi Uwe,

On Fri, Jun 28, 2013 at 4:29 AM, Uwe Kleine-König
<u.kleine-koenig@pengutronix.de> wrote:
> On Fri, Jun 28, 2013 at 12:32:01AM -0300, Fabio Estevam wrote:
>> From: Fabio Estevam <fabio.estevam@freescale.com>
>>
>> When building imx_v6_v7_defconfig with imx-drm drivers selected as modules, we
>> get the following build error:
>>
>> ERROR: "imx_drm_encoder_get_mux_id" [drivers/staging/imx-drm/imx-ldb.ko] undefined!
> So imx-ldb.c needs a symbol from imx-drm-core.c right? The alternative
> to exporting this symbol for a single user(?) is to link these two files
> into a single module. Does this make sense? If yes, that would IMHO be
> the better fix.

The Makefile for these files is:

imxdrm-objs := imx-drm-core.o imx-fb.o

obj-$(CONFIG_DRM_IMX) += imxdrm.o

obj-$(CONFIG_DRM_IMX_PARALLEL_DISPLAY) += parallel-display.o
obj-$(CONFIG_DRM_IMX_TVE) += imx-tve.o
obj-$(CONFIG_DRM_IMX_LDB) += imx-ldb.o
obj-$(CONFIG_DRM_IMX_FB_HELPER) += imx-fbdev.o
obj-$(CONFIG_DRM_IMX_IPUV3_CORE) += ipu-v3/
obj-$(CONFIG_DRM_IMX_IPUV3)	+= ipuv3-crtc.o

so imx-drm-core is always built and imx-ldb is only built when
CONFIG_DRM_IMX_LDB is selected.

In this case, we should keep the two modules separate and fix this
error using the export.

Regards,

Fabio Estevam