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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2019-08-24 11:16:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-08-24 11:16:04 -0700 |
| commit | bc67b17eb91ea6a2b6d943bb64cde8d1438a11ec (patch) | |
| tree | a69457498720dc9bdd52dc7167d0ed6b0c2a1d8b /drivers | |
| parent | Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma (diff) | |
| parent | drm/mediatek: include dma-mapping header (diff) | |
| download | linux-dev-bc67b17eb91ea6a2b6d943bb64cde8d1438a11ec.tar.xz linux-dev-bc67b17eb91ea6a2b6d943bb64cde8d1438a11ec.zip | |
Merge tag 'drm-fixes-2019-08-24' of git://anongit.freedesktop.org/drm/drm
Pull more drm fixes from Dave Airlie:
"Although the tree built for me fine on arm here, it appears either
header cleanups in next or some kconfig combo it breaks, so this
contains a fix to mediatek to include dma-mapping.h explicitly.
There was also one nouveau fix that came in late that I was going to
leave until next week, but since I was sending this I thought it may
as well be in here:
mediatek:
- fix build in some cases
nouveau:
- fix hang with i2c and mst docks"
* tag 'drm-fixes-2019-08-24' of git://anongit.freedesktop.org/drm/drm:
drm/mediatek: include dma-mapping header
drm/nouveau: Don't retry infinitely when receiving no data on i2c over AUX
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/mediatek/mtk_drm_drv.c | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c | 24 |
2 files changed, 18 insertions, 7 deletions
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c index 7f5408cb2377..945bc20f1d33 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -17,6 +17,7 @@ #include <linux/of_address.h> #include <linux/of_platform.h> #include <linux/pm_runtime.h> +#include <linux/dma-mapping.h> #include "mtk_drm_crtc.h" #include "mtk_drm_ddp.h" diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c index b4e7404fe660..a11637b0f6cc 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/aux.c @@ -40,8 +40,7 @@ nvkm_i2c_aux_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) u8 *ptr = msg->buf; while (remaining) { - u8 cnt = (remaining > 16) ? 16 : remaining; - u8 cmd; + u8 cnt, retries, cmd; if (msg->flags & I2C_M_RD) cmd = 1; @@ -51,10 +50,19 @@ nvkm_i2c_aux_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) if (mcnt || remaining > 16) cmd |= 4; /* MOT */ - ret = aux->func->xfer(aux, true, cmd, msg->addr, ptr, &cnt); - if (ret < 0) { - nvkm_i2c_aux_release(aux); - return ret; + for (retries = 0, cnt = 0; + retries < 32 && !cnt; + retries++) { + cnt = min_t(u8, remaining, 16); + ret = aux->func->xfer(aux, true, cmd, + msg->addr, ptr, &cnt); + if (ret < 0) + goto out; + } + if (!cnt) { + AUX_TRACE(aux, "no data after 32 retries"); + ret = -EIO; + goto out; } ptr += cnt; @@ -64,8 +72,10 @@ nvkm_i2c_aux_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) msg++; } + ret = num; +out: nvkm_i2c_aux_release(aux); - return num; + return ret; } static u32 |