linux-kernel - [PATCH 2/3] staging: olpc_dcon: drop support for DCON v1

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Date:	Thu, 21 Jul 2011 20:37:55 -0700
From:	Andres Salomon <dilinger@...ued.net>
To:	gregkh@...e.de
Cc:	linux-kernel@...r.kernel.org, cjb@...top.org,
	jon.nettleton@...il.com, devel@...verdev.osuosl.org
Subject: [PATCH 2/3] staging: olpc_dcon: drop support for DCON v1

The v1 DCONs only existed for XO-1 prototypes (and even then, very very
early prototypes).  Drop support for v1 DCON.

Signed-off-by: Andres Salomon <dilinger@...ued.net>
---
 drivers/staging/olpc_dcon/olpc_dcon.c |   31 ++++++++++---------------------
 1 files changed, 10 insertions(+), 21 deletions(-)

diff --git a/drivers/staging/olpc_dcon/olpc_dcon.c b/drivers/staging/olpc_dcon/olpc_dcon.c
index cf4b454..ae18cd4 100644
--- a/drivers/staging/olpc_dcon/olpc_dcon.c
+++ b/drivers/staging/olpc_dcon/olpc_dcon.c
@@ -88,29 +88,18 @@ static int dcon_hw_init(struct dcon_priv *dcon, int is_init)
 	}
 
 	if (ver < 0xdc02) {
-		/* Initialize the DCON registers */
-
-		/* Start with work-arounds for DCON ASIC */
-		i2c_smbus_write_word_data(client, 0x4b, 0x00cc);
-		i2c_smbus_write_word_data(client, 0x4b, 0x00cc);
-		i2c_smbus_write_word_data(client, 0x4b, 0x00cc);
-		i2c_smbus_write_word_data(client, 0x0b, 0x007a);
-		i2c_smbus_write_word_data(client, 0x36, 0x025c);
-		i2c_smbus_write_word_data(client, 0x37, 0x025e);
-
-		/* Initialise SDRAM */
-
-		i2c_smbus_write_word_data(client, 0x3b, 0x002b);
-		i2c_smbus_write_word_data(client, 0x41, 0x0101);
-		i2c_smbus_write_word_data(client, 0x42, 0x0101);
-	} else {
-		/* SDRAM setup/hold time */
-		i2c_smbus_write_word_data(client, 0x3a, 0xc040);
-		i2c_smbus_write_word_data(client, 0x41, 0x0000);
-		i2c_smbus_write_word_data(client, 0x41, 0x0101);
-		i2c_smbus_write_word_data(client, 0x42, 0x0101);
+		dev_err(&dcon->client->dev,
+				"DCON v1 is unsupported, giving up..\n");
+		rc = -ENODEV;
+		goto err;
 	}
 
+	/* SDRAM setup/hold time */
+	i2c_smbus_write_word_data(client, 0x3a, 0xc040);
+	i2c_smbus_write_word_data(client, 0x41, 0x0000);
+	i2c_smbus_write_word_data(client, 0x41, 0x0101);
+	i2c_smbus_write_word_data(client, 0x42, 0x0101);
+
 	/* Colour swizzle, AA, no passthrough, backlight */
 	if (is_init) {
 		dcon->disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE |
-- 
1.7.2.5

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