[PATCH] drm/radeon: add a i2c bus mutex
Am 08.05.2014 16:58, schrieb Alex Deucher:
> The i2c and aux buses use the same pads so add
> a mutex to protect access to the pads.
>
> Signed-off-by: Alex Deucher
I've applied this one, "drm/radeon: fix DCE83 check for mullins" and
"drm/radeon: handle non-VGA class pci devices with ATRM" my 3.15 queue.
Thanks,
Christian.
> ---
> drivers/gpu/drm/radeon/atombios_dp.c | 18 ++
> drivers/gpu/drm/radeon/atombios_i2c.c | 17 +
> drivers/gpu/drm/radeon/radeon_i2c.c | 9 +
> drivers/gpu/drm/radeon/radeon_mode.h | 1 +
> 4 files changed, 37 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/atombios_dp.c
> b/drivers/gpu/drm/radeon/atombios_dp.c
> index 54e4f52..3bb0933 100644
> --- a/drivers/gpu/drm/radeon/atombios_dp.c
> +++ b/drivers/gpu/drm/radeon/atombios_dp.c
> @@ -95,9 +95,12 @@ static int radeon_process_aux_ch(struct radeon_i2c_chan
> *chan,
> int index = GetIndexIntoMasterTable(COMMAND,
> ProcessAuxChannelTransaction);
> unsigned char *base;
> int recv_bytes;
> + int r = 0;
>
> memset(, 0, sizeof(args));
>
> + mutex_lock(>mutex);
> +
> base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
>
> radeon_atom_copy_swap(base, send, send_bytes, true);
> @@ -117,19 +120,22 @@ static int radeon_process_aux_ch(struct radeon_i2c_chan
> *chan,
> /* timeout */
> if (args.v1.ucReplyStatus == 1) {
> DRM_DEBUG_KMS("dp_aux_ch timeout\n");
> - return -ETIMEDOUT;
> + r = -ETIMEDOUT;
> + goto done;
> }
>
> /* flags not zero */
> if (args.v1.ucReplyStatus == 2) {
> DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
> - return -EBUSY;
> + r = -EBUSY;
> + goto done;
> }
>
> /* error */
> if (args.v1.ucReplyStatus == 3) {
> DRM_DEBUG_KMS("dp_aux_ch error\n");
> - return -EIO;
> + r = -EIO;
> + goto done;
> }
>
> recv_bytes = args.v1.ucDataOutLen;
> @@ -139,7 +145,11 @@ static int radeon_process_aux_ch(struct radeon_i2c_chan
> *chan,
> if (recv && recv_size)
> radeon_atom_copy_swap(recv, base + 16, recv_bytes, false);
>
> - return recv_bytes;
> + r = recv_bytes;
> +done:
> + mutex_unlock(>mutex);
> +
> + return r;
> }
>
> #define BARE_ADDRESS_SIZE 3
> diff --git a/drivers/gpu/drm/radeon/atombios_i2c.c
> b/drivers/gpu/drm/radeon/atombios_i2c.c
> index b5162c3..9c570fb 100644
> --- a/drivers/gpu/drm/radeon/atombios_i2c.c
> +++ b/drivers/gpu/drm/radeon/atombios_i2c.c
> @@ -43,15 +43,19 @@ static int radeon_process_i2c_ch(struct radeon_i2c_chan
> *chan,
> int index = GetIndexIntoMasterTable(COMMAND,
> ProcessI2cChannelTransaction);
> unsigned char *base;
> u16 out = cpu_to_le16(0);
> + int r = 0;
>
> memset(, 0, sizeof(args));
>
> + mutex_lock(>mutex);
> +
> base = (unsigned char *)rdev->mode_info.atom_context->scratch;
>
> if (flags & HW_I2C_WRITE) {
> if (num > ATOM_MAX_HW_I2C_WRITE) {
> DRM_ERROR("hw i2c: tried to write too many bytes (%d vs
> 3)\n", num);
> - return -EINVAL;
> + r = -EINVAL;
> + goto done;
> }
> if (buf == NULL)
> args.ucRegIndex = 0;
> @@ -65,7 +69,8 @@ static int radeon_process_i2c_ch(struct radeon_i2c_chan
> *chan,
> } else {
> if (num > ATOM_MAX_HW_I2C_READ) {
> DRM_ERROR("hw i2c: tried to read too many bytes (%d vs
> 255)\n", num);
> - return -EINVAL;
> + r = -EINVAL;
> + goto done;
> }
> args.ucRegIndex = 0;
> args.lpI2CDataOut = 0;
> @@ -82,13 +87,17 @@ static int radeon_process_i2c_ch(struct radeon_i2c_chan
> *chan,
> /* error */
> if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) {
> DRM_DEBUG_KMS("hw_i2c error\n");
> - return -EIO;
> + r = -EIO;
> + goto done;
> }
>
> if (!(flags & HW_I2C_WRITE))
> radeon_atom_copy_swap(buf, base, num, false);
>
> - return 0;
> +done:
> + mutex_unlock(>mutex);
> +
> + return r;
> }
>
> int radeon_atom_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
> diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c
> b/drivers/gpu/drm/radeon/radeon_i2c.c
> index 7b94414..427ee4d 100644
> --- a/drivers/gpu/drm/radeon/radeon_i2c.c
> +++ b/drivers/gpu/drm/radeon/radeon_i2c.c
> @@ -94,6 +94,8 @@ static int pre_xfer(struct i2c_adapter *i2c_adap)
> struct radeon_i2c_bus_rec *rec = >rec;
> uint32_t temp;
>
> + mutex_lock(>mutex);
> +
> /* RV410 appears to have a bug where the hw i2c in reset
>* holds the i2c
[PATCH] drm/radeon: add a i2c bus mutex
The i2c and aux buses use the same pads so add
a mutex to protect access to the pads.
Signed-off-by: Alex Deucher
---
drivers/gpu/drm/radeon/atombios_dp.c | 18 ++
drivers/gpu/drm/radeon/atombios_i2c.c | 17 +
drivers/gpu/drm/radeon/radeon_i2c.c | 9 +
drivers/gpu/drm/radeon/radeon_mode.h | 1 +
4 files changed, 37 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c
b/drivers/gpu/drm/radeon/atombios_dp.c
index 54e4f52..3bb0933 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -95,9 +95,12 @@ static int radeon_process_aux_ch(struct radeon_i2c_chan
*chan,
int index = GetIndexIntoMasterTable(COMMAND,
ProcessAuxChannelTransaction);
unsigned char *base;
int recv_bytes;
+ int r = 0;
memset(, 0, sizeof(args));
+ mutex_lock(>mutex);
+
base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
radeon_atom_copy_swap(base, send, send_bytes, true);
@@ -117,19 +120,22 @@ static int radeon_process_aux_ch(struct radeon_i2c_chan
*chan,
/* timeout */
if (args.v1.ucReplyStatus == 1) {
DRM_DEBUG_KMS("dp_aux_ch timeout\n");
- return -ETIMEDOUT;
+ r = -ETIMEDOUT;
+ goto done;
}
/* flags not zero */
if (args.v1.ucReplyStatus == 2) {
DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
- return -EBUSY;
+ r = -EBUSY;
+ goto done;
}
/* error */
if (args.v1.ucReplyStatus == 3) {
DRM_DEBUG_KMS("dp_aux_ch error\n");
- return -EIO;
+ r = -EIO;
+ goto done;
}
recv_bytes = args.v1.ucDataOutLen;
@@ -139,7 +145,11 @@ static int radeon_process_aux_ch(struct radeon_i2c_chan
*chan,
if (recv && recv_size)
radeon_atom_copy_swap(recv, base + 16, recv_bytes, false);
- return recv_bytes;
+ r = recv_bytes;
+done:
+ mutex_unlock(>mutex);
+
+ return r;
}
#define BARE_ADDRESS_SIZE 3
diff --git a/drivers/gpu/drm/radeon/atombios_i2c.c
b/drivers/gpu/drm/radeon/atombios_i2c.c
index b5162c3..9c570fb 100644
--- a/drivers/gpu/drm/radeon/atombios_i2c.c
+++ b/drivers/gpu/drm/radeon/atombios_i2c.c
@@ -43,15 +43,19 @@ static int radeon_process_i2c_ch(struct radeon_i2c_chan
*chan,
int index = GetIndexIntoMasterTable(COMMAND,
ProcessI2cChannelTransaction);
unsigned char *base;
u16 out = cpu_to_le16(0);
+ int r = 0;
memset(, 0, sizeof(args));
+ mutex_lock(>mutex);
+
base = (unsigned char *)rdev->mode_info.atom_context->scratch;
if (flags & HW_I2C_WRITE) {
if (num > ATOM_MAX_HW_I2C_WRITE) {
DRM_ERROR("hw i2c: tried to write too many bytes (%d vs
3)\n", num);
- return -EINVAL;
+ r = -EINVAL;
+ goto done;
}
if (buf == NULL)
args.ucRegIndex = 0;
@@ -65,7 +69,8 @@ static int radeon_process_i2c_ch(struct radeon_i2c_chan *chan,
} else {
if (num > ATOM_MAX_HW_I2C_READ) {
DRM_ERROR("hw i2c: tried to read too many bytes (%d vs
255)\n", num);
- return -EINVAL;
+ r = -EINVAL;
+ goto done;
}
args.ucRegIndex = 0;
args.lpI2CDataOut = 0;
@@ -82,13 +87,17 @@ static int radeon_process_i2c_ch(struct radeon_i2c_chan
*chan,
/* error */
if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) {
DRM_DEBUG_KMS("hw_i2c error\n");
- return -EIO;
+ r = -EIO;
+ goto done;
}
if (!(flags & HW_I2C_WRITE))
radeon_atom_copy_swap(buf, base, num, false);
- return 0;
+done:
+ mutex_unlock(>mutex);
+
+ return r;
}
int radeon_atom_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c
b/drivers/gpu/drm/radeon/radeon_i2c.c
index 7b94414..427ee4d 100644
--- a/drivers/gpu/drm/radeon/radeon_i2c.c
+++ b/drivers/gpu/drm/radeon/radeon_i2c.c
@@ -94,6 +94,8 @@ static int pre_xfer(struct i2c_adapter *i2c_adap)
struct radeon_i2c_bus_rec *rec = >rec;
uint32_t temp;
+ mutex_lock(>mutex);
+
/* RV410 appears to have a bug where the hw i2c in reset
* holds the i2c port in a bad state - switch hw i2c away before
* doing DDC - do this for all r200s/r300s/r400s for safety sake
@@ -170,6 +172,8 @@ static void post_xfer(struct i2c_adapter *i2c_adap)
temp = RREG32(rec->mask_data_reg) & ~rec->mask_data_mask;
WREG32(rec->mask_data_reg, temp);
temp = RREG32(rec->mask_data_reg);
+
+ mutex_unlock(>mutex);
}
