linux-kernel - [PATCH v3 3/3] staging: fbtft: access screen buffer directly

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Date:	Wed, 7 Oct 2015 09:20:14 +0200
From:	Lars Svensson <lars1.svensson@...ymobile.com>
To:	<thomas.petazzoni@...e-electrons.com>, <noralf@...nnes.org>,
	<plagnioj@...osoft.com>, <tomi.valkeinen@...com>
CC:	<linux-fbdev@...r.kernel.org>, <gregkh@...uxfoundation.org>,
	<devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
	<dan.carpenter@...cle.com>,
	Lars Svensson <lars1.svensson@...ymobile.com>
Subject: [PATCH v3 3/3] staging: fbtft: access screen buffer directly

In fbtft-bus.c:fbtft_write_vmem16_bus9(), ioread8() is used for
accessing the provided screen array. Since screen_buffer actually
points to an ordinary buffer, instead access it directly.

Signed-off-by: Lars Svensson <lars1.svensson@...ymobile.com>
---
 drivers/staging/fbtft/fbtft-bus.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/fbtft/fbtft-bus.c b/drivers/staging/fbtft/fbtft-bus.c
index f5a36a4..04efe90 100644
--- a/drivers/staging/fbtft/fbtft-bus.c
+++ b/drivers/staging/fbtft/fbtft-bus.c
@@ -184,7 +184,7 @@ EXPORT_SYMBOL(fbtft_write_vmem16_bus8);
 /* 16 bit pixel over 9-bit SPI bus: dc + high byte, dc + low byte */
 int fbtft_write_vmem16_bus9(struct fbtft_par *par, size_t offset, size_t len)
 {
-	u8 __iomem *vmem8;
+	u8 *vmem8;
 	u16 *txbuf16 = par->txbuf.buf;
 	size_t remain;
 	size_t to_copy;
@@ -212,12 +212,12 @@ int fbtft_write_vmem16_bus9(struct fbtft_par *par, size_t offset, size_t len)
 
 #ifdef __LITTLE_ENDIAN
 		for (i = 0; i < to_copy; i += 2) {
-			txbuf16[i]     = 0x0100 | ioread8(vmem8 + i + 1);
-			txbuf16[i + 1] = 0x0100 | ioread8(vmem8 + i);
+			txbuf16[i]     = 0x0100 | vmem8[i + 1];
+			txbuf16[i + 1] = 0x0100 | vmem8[i];
 		}
 #else
 		for (i = 0; i < to_copy; i++)
-			txbuf16[i]   = 0x0100 | ioread8(vmem8 + i);
+			txbuf16[i]   = 0x0100 | vmem8[i];
 #endif
 		vmem8 = vmem8 + to_copy;
 		ret = par->fbtftops.write(par, par->txbuf.buf, to_copy*2);
-- 
2.4.2

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