drm/omap: Hide sparse warnings

sparse reports:

drivers/gpu/drm/omapdrm/omap_dmm_tiler.c:122:16: warning: incorrect type in argument 1 (different address spaces)
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c:122:16:    expected void const volatile [noderef] __iomem *addr
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c:122:16:    got unsigned int [usertype] *wa_dma_data
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c:130:9: warning: incorrect type in argument 2 (different address spaces)
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c:130:9:    expected void volatile [noderef] __iomem *addr
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c:130:9:    got unsigned int [usertype] *wa_dma_data
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c:414:9: warning: incorrect type in argument 1 (different address spaces)
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c:414:9:    expected void const volatile [noderef] __iomem *addr
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c:414:9:    got unsigned int *

These come from pieces of code which do essentially:

p = dma_alloc_coherent()

dma_transfer_to_p()
readl(p)

writel(x, p)
dma_transfer_from_p()

I think we would do just fine without readl() and writel(), accessing
the memory without any extras, but ensuring that the necessary barriers
are in place. But this code is for a legacy platform, has been working
for ages, and it's doing work-arounds for hardware issues, and those
hardware issues are very difficult to trigger... So I would just rather
leave the code be as it is now.

However, the warnings are not nice. Hide the warnings by a (__iomem void
*) typecast.

Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Cc: Ville Syrjälä <[email protected]>
Reviewed-by: Sebastian Reichel <[email protected]>
Signed-off-by: Tomi Valkeinen <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
index 1aca3060333e..fcd600024136 100644
--- a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
+++ b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
@@ -119,7 +119,7 @@ static u32 dmm_read_wa(struct dmm *dmm, u32 reg)
 	 * earlier than the DMA finished writing the value to memory.
 	 */
 	rmb();
-	return readl(dmm->wa_dma_data);
+	return readl((__iomem void *)dmm->wa_dma_data);
 }
 
 static void dmm_write_wa(struct dmm *dmm, u32 val, u32 reg)
@@ -127,7 +127,7 @@ static void dmm_write_wa(struct dmm *dmm, u32 val, u32 reg)
 	dma_addr_t src, dst;
 	int r;
 
-	writel(val, dmm->wa_dma_data);
+	writel(val, (__iomem void *)dmm->wa_dma_data);
 	/*
 	 * As per i878 workaround, the DMA is used to access the DMM registers.
 	 * Make sure that the writel is not moved by the compiler or the CPU, so
@@ -411,7 +411,7 @@ static int dmm_txn_commit(struct dmm_txn *txn, bool wait)
 	 */
 
 	/* read back to ensure the data is in RAM */
-	readl(&txn->last_pat->next_pa);
+	readl((__iomem void *)&txn->last_pat->next_pa);
 
 	/* write to PAT_DESCR to clear out any pending transaction */
 	dmm_write(dmm, 0x0, reg[PAT_DESCR][engine->id]);