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6 Commits

Author SHA1 Message Date
Biju Das
7d3a3aaaa9 dmaengine: sh: rz-dmac: Add device_synchronize callback 
Some on-chip peripheral modules(for eg:- rspi) on RZ/G2L SoC
use the same signal for both interrupt and DMA transfer requests.
The signal works as a DMA transfer request signal by setting
DMARS, and subsequent interrupt requests to the interrupt controller
are masked.

We can re-enable the interrupt by clearing the DMARS.

This patch adds device_synchronize callback for clearing
DMARS and thereby allowing DMA consumers to switch to
interrupt mode.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20220722084430.969333-1-biju.das.jz@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
 2022-07-26 18:27:50 +05:30
Colin Ian King
4c0eee5065 dmaengine: sh: make array ds_lut static 
Don't populate the read-only array ds_lut on the stack but instead it
static. Also makes the object code smaller by 163 bytes:

Before:
   text    data     bss     dec     hex filename
  23508    4796       0   28304    6e90 ./drivers/dma/sh/rz-dmac.o

After:
   text    data     bss     dec     hex filename
  23281    4860       0   28141    6ded ./drivers/dma/sh/rz-dmac.o

(gcc version 11.2.0)

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210915112038.12407-1-colin.king@canonical.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
 2021-10-25 12:15:34 +05:30
Biju Das
161596fd77 dmaengine: sh: rz-dmac: Add DMA clock handling 
Currently, DMA clocks are turned on by the bootloader.
This patch adds support for DMA clock handling so that
the driver manages the DMA clocks.

Fixes: 5000d37042a6 ("dmaengine: sh: Add DMAC driver for RZ/G2L SoC")
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210923102451.11403-1-biju.das.jz@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
 2021-10-18 12:06:44 +05:30
Dan Carpenter
11a427be2c dmaengine: sh: fix some NULL dereferences 
The dma_free_coherent() function needs a valid device pointer or it will
crash.

Fixes: 550c591a89a1 ("dmaengine: sh: Add DMAC driver for RZ/G2L SoC")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20210827085410.GA9183@kili
Signed-off-by: Vinod Koul <vkoul@kernel.org>
 2021-08-31 21:50:23 +05:30
Colin Ian King
1e008336b9 dmaengine: sh: Fix unused initialization of pointer lmdesc 
Pointer lmdesc is being inintialized with a value that is never read,
it is later being re-assigned a new value. Fix this by initializing
it with the latter value.

Addresses-Coverity: ("Unused value")
Fixes: 550c591a89a1 ("dmaengine: sh: Add DMAC driver for RZ/G2L SoC")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210829152811.529766-1-colin.king@canonical.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
 2021-08-31 21:49:25 +05:30
Biju Das
5000d37042 dmaengine: sh: Add DMAC driver for RZ/G2L SoC 
Add DMA Controller driver for RZ/G2L SoC.

Based on the work done by Chris Brandt for RZ/A DMA driver.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20210806095322.2326-4-biju.das.jz@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
 2021-08-29 19:14:19 +05:30