drm/i915: add support for dvo Chrontel 7010B

This patch add dvo detection for the Chrontel 7010B on some old hardware.

References: https://bugzilla.kernel.org/show_bug.cgi?id=55101
Signed-off-by: Braggle <braggle at free.fr>
[danvet: Fix up whitespace mangling.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 33 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/dvo_ch7xxx.c b/drivers/gpu/drm/i915/dvo_ch7xxx.c
index 3edd981e0770..757e0fa11043 100644
--- a/drivers/gpu/drm/i915/dvo_ch7xxx.c
+++ b/drivers/gpu/drm/i915/dvo_ch7xxx.c
@@ -32,12 +32,14 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define CH7xxx_REG_DID          0x4b
 
 #define CH7011_VID              0x83 /* 7010 as well */
+#define CH7010B_VID             0x05
 #define CH7009A_VID             0x84
 #define CH7009B_VID             0x85
 #define CH7301_VID              0x95
 
 #define CH7xxx_VID              0x84
 #define CH7xxx_DID              0x17
+#define CH7010_DID              0x16
 
 #define CH7xxx_NUM_REGS         0x4c
 
@@ -87,11 +89,20 @@ static struct ch7xxx_id_struct {
         char *name;
 } ch7xxx_ids[] = {
         { CH7011_VID, "CH7011" },
+        { CH7010B_VID, "CH7010B" },
         { CH7009A_VID, "CH7009A" },
         { CH7009B_VID, "CH7009B" },
         { CH7301_VID, "CH7301" },
 };
 
+static struct ch7xxx_did_struct {
+        uint8_t did;
+        char *name;
+} ch7xxx_dids[] = {
+        { CH7xxx_DID, "CH7XXX" },
+        { CH7010_DID, "CH7010B" },
+};
+
 struct ch7xxx_priv {
         bool quiet;
 };
@@ -108,6 +119,18 @@ static char *ch7xxx_get_id(uint8_t vid)
         return NULL;
 }
 
+static char *ch7xxx_get_did(uint8_t did)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(ch7xxx_dids); i++) {
+                if (ch7xxx_dids[i].did == did)
+                        return ch7xxx_dids[i].name;
+        }
+
+        return NULL;
+}
+
 /** Reads an 8 bit register */
 static bool ch7xxx_readb(struct intel_dvo_device *dvo, int addr, uint8_t *ch)
 {
@@ -179,7 +202,7 @@ static bool ch7xxx_init(struct intel_dvo_device *dvo,
         /* this will detect the CH7xxx chip on the specified i2c bus */
         struct ch7xxx_priv *ch7xxx;
         uint8_t vendor, device;
-        char *name;
+        char *name, *devid;
 
         ch7xxx = kzalloc(sizeof(struct ch7xxx_priv), GFP_KERNEL);
         if (ch7xxx == NULL)
@@ -204,7 +227,8 @@ static bool ch7xxx_init(struct intel_dvo_device *dvo,
         if (!ch7xxx_readb(dvo, CH7xxx_REG_DID, &device))
                 goto out;
 
-        if (device != CH7xxx_DID) {
+        devid = ch7xxx_get_did(device);
+        if (!devid) {
                 DRM_DEBUG_KMS("ch7xxx not detected; got 0x%02x from %s "
                                 "slave %d.\n",
                           vendor, adapter->name, dvo->slave_addr);
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index 00e70dbe82da..ee328ce8e9fe 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -54,6 +54,13 @@ static const struct intel_dvo_device intel_dvo_devices[] = {
                 .dev_ops = &ch7xxx_ops,
         },
         {
+                .type = INTEL_DVO_CHIP_TMDS,
+                .name = "ch7xxx",
+                .dvo_reg = DVOC,
+                .slave_addr = 0x75, /* For some ch7010 */
+                .dev_ops = &ch7xxx_ops,
+        },
+        {
                 .type = INTEL_DVO_CHIP_LVDS,
                 .name = "ivch",
                 .dvo_reg = DVOA,