[PATCH] drm/amd/display: dcn20: include linux/delay.h

[PATCH] drm/amd/display: dcn20: include linux/delay.h

[Arnd Bergmann]

Without this header, we get a compiler error in some configurations:

.../dc/dcn20/dcn20_hwseq.c: In function 'dcn20_hwss_wait_for_blank_complete':
.../dc/dcn20/dcn20_hwseq.c:1493:3: error: implicit declaration of function 'udelay' [-Werror=implicit-function-declaration]

Note: the use of udelay itself may be problematic, as can occupy
the CPU for 200ms in a busy-loop here.

Fixes: 7ed4e6352c16 ("drm/amd/display: Add DCN2 HW Sequencer and Resource")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
index 4b0d8b9f61da..6925d25d2457 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
@@ -22,6 +22,7 @@
  * Authors: AMD
  *
  */
+#include <linux/delay.h>
 
 #include "dm_services.h"
 #include "dm_helpers.h"
-- 
2.20.0

Re: [PATCH] drm/amd/display: dcn20: include linux/delay.h

[Alex Deucher]

On Mon, Jul 8, 2019 at 9:53 AM Arnd Bergmann <arnd@arndb.de> wrote:
>
> Without this header, we get a compiler error in some configurations:
>
> .../dc/dcn20/dcn20_hwseq.c: In function 'dcn20_hwss_wait_for_blank_complete':
> .../dc/dcn20/dcn20_hwseq.c:1493:3: error: implicit declaration of function 'udelay' [-Werror=implicit-function-declaration]
>
> Note: the use of udelay itself may be problematic, as can occupy
> the CPU for 200ms in a busy-loop here.
>
> Fixes: 7ed4e6352c16 ("drm/amd/display: Add DCN2 HW Sequencer and Resource")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Applied.  thanks!

Alex

> ---
>  drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
> index 4b0d8b9f61da..6925d25d2457 100644
> --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
> +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
> @@ -22,6 +22,7 @@
>   * Authors: AMD
>   *
>   */
> +#include <linux/delay.h>
>
>  #include "dm_services.h"
>  #include "dm_helpers.h"
> --
> 2.20.0
>
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