drm/i2c: tda998x: fix EDID reading on TDA19988 devices

TDA19988 devices need their RAM enabled in order to read EDID
information.  Add support for this.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Rob Clark <robdclark@gmail.com>
Tested-by: Darren Etheridge <detheridge@ti.com>
Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: Russell King <rmk_kernel@arm.linux.org.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index e68b58a1aaf9..d71c408916e4 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -229,6 +229,8 @@ struct tda998x_priv {
 
 /* Page 12h: HDCP and OTP */
 #define REG_TX3                   REG(0x12, 0x9a)     /* read/write */
+#define REG_TX4                   REG(0x12, 0x9b)     /* read/write */
+# define TX4_PD_RAM               (1 << 1)
 #define REG_TX33                  REG(0x12, 0xb8)     /* read/write */
 # define TX33_HDMI                (1 << 1)
 
@@ -673,6 +675,7 @@ read_edid_block(struct drm_encoder *encoder, uint8_t *buf, int blk)
 static uint8_t *
 do_get_edid(struct drm_encoder *encoder)
 {
+        struct tda998x_priv *priv = to_tda998x_priv(encoder);
         int j = 0, valid_extensions = 0;
         uint8_t *block, *new;
         bool print_bad_edid = drm_debug & DRM_UT_KMS;
@@ -680,6 +683,9 @@ do_get_edid(struct drm_encoder *encoder)
         if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
                 return NULL;
 
+        if (priv->rev == TDA19988)
+                reg_clear(encoder, REG_TX4, TX4_PD_RAM);
+
         /* base block fetch */
         if (read_edid_block(encoder, block, 0))
                 goto fail;
@@ -689,7 +695,7 @@ do_get_edid(struct drm_encoder *encoder)
 
         /* if there's no extensions, we're done */
         if (block[0x7e] == 0)
-                return block;
+                goto done;
 
         new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
         if (!new)
@@ -716,9 +722,15 @@ do_get_edid(struct drm_encoder *encoder)
                 block = new;
         }
 
+done:
+        if (priv->rev == TDA19988)
+                reg_set(encoder, REG_TX4, TX4_PD_RAM);
+
         return block;
 
 fail:
+        if (priv->rev == TDA19988)
+                reg_set(encoder, REG_TX4, TX4_PD_RAM);
         dev_warn(encoder->dev->dev, "failed to read EDID\n");
         kfree(block);
         return NULL;