From patchwork Sat Apr 16 09:17:38 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 712111 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p3G9MWZP010328 for ; Sat, 16 Apr 2011 09:22:52 GMT Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1D8769EB25 for ; Sat, 16 Apr 2011 02:22:32 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from fireflyinternet.com (server109-228-6-236.live-servers.net [109.228.6.236]) by gabe.freedesktop.org (Postfix) with ESMTP id B91C09EB09 for ; Sat, 16 Apr 2011 02:18:13 -0700 (PDT) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.66.37; Received: from arrandale.alporthouse.com (unverified [78.156.66.37]) by fireflyinternet.com (Firefly Internet SMTP) with ESMTP id 32233678-1500050 for multiple; Sat, 16 Apr 2011 10:17:53 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Sat, 16 Apr 2011 10:17:38 +0100 Message-Id: <1302945465-32115-15-git-send-email-chris@chris-wilson.co.uk> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1302945465-32115-1-git-send-email-chris@chris-wilson.co.uk> References: <1302945465-32115-1-git-send-email-chris@chris-wilson.co.uk> X-Originating-IP: 78.156.66.37 Subject: [Intel-gfx] [PATCH 14/21] drm/i915/i2c: Convert from using GMBUS1 + reg_offset idiom to reg + 0 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Sat, 16 Apr 2011 09:22:52 +0000 (UTC) Keith complained that GMBUSx + reg_offset was ugly. An alternative naming scheme which is more consistent with the reset of the code base is to store the address of the GMBUS0 and then reference each of the GMBUSx registers as an offset from GMBUS0. Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/intel_i2c.c | 51 +++++++++++++++++++++---------------- 1 files changed, 29 insertions(+), 22 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c index d3b903b..ed11523 100644 --- a/drivers/gpu/drm/i915/intel_i2c.c +++ b/drivers/gpu/drm/i915/intel_i2c.c @@ -51,6 +51,11 @@ struct intel_gpio { u32 reg; }; +static int intel_gmbus_reg0(struct drm_device *dev) +{ + return HAS_PCH_SPLIT(dev) ? PCH_GMBUS0 : GMBUS0; +} + void intel_i2c_reset(struct drm_device *dev) { @@ -232,36 +237,36 @@ gmbus_xfer(struct i2c_adapter *adapter, struct intel_gmbus, adapter); struct drm_i915_private *dev_priv = adapter->algo_data; - int i, reg_offset; + int i, reg; if (bus->force_bit) return intel_i2c_quirk_xfer(dev_priv, bus->force_bit, msgs, num); - reg_offset = HAS_PCH_SPLIT(dev_priv->dev) ? PCH_GMBUS0 - GMBUS0 : 0; + reg = intel_gmbus_reg0(dev_priv->dev); - I915_WRITE(GMBUS0 + reg_offset, bus->reg0); + I915_WRITE(reg + 0, bus->reg0); for (i = 0; i < num; i++) { u16 len = msgs[i].len; u8 *buf = msgs[i].buf; if (msgs[i].flags & I2C_M_RD) { - I915_WRITE(GMBUS1 + reg_offset, + I915_WRITE(reg + 1, GMBUS_CYCLE_WAIT | (i + 1 == num ? GMBUS_CYCLE_STOP : 0) | (len << GMBUS_BYTE_COUNT_SHIFT) | (msgs[i].addr << GMBUS_SLAVE_ADDR_SHIFT) | GMBUS_SLAVE_READ | GMBUS_SW_RDY); - POSTING_READ(GMBUS2+reg_offset); + POSTING_READ(reg + 2); do { u32 val, loop = 0; - if (wait_for(I915_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_RDY), 50)) + if (wait_for(I915_READ(reg + 2) & (GMBUS_SATOER | GMBUS_HW_RDY), 50)) goto timeout; - if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER) + if (I915_READ(reg + 2) & GMBUS_SATOER) goto clear_err; - val = I915_READ(GMBUS3 + reg_offset); + val = I915_READ(reg + 3); do { *buf++ = val & 0xff; val >>= 8; @@ -275,18 +280,18 @@ gmbus_xfer(struct i2c_adapter *adapter, val |= *buf++ << (8 * loop); } while (--len && ++loop < 4); - I915_WRITE(GMBUS3 + reg_offset, val); - I915_WRITE(GMBUS1 + reg_offset, + I915_WRITE(reg + 3, val); + I915_WRITE(reg + 1, (i + 1 == num ? GMBUS_CYCLE_STOP : GMBUS_CYCLE_WAIT) | (msgs[i].len << GMBUS_BYTE_COUNT_SHIFT) | (msgs[i].addr << GMBUS_SLAVE_ADDR_SHIFT) | GMBUS_SLAVE_WRITE | GMBUS_SW_RDY); - POSTING_READ(GMBUS2+reg_offset); + POSTING_READ(reg + 2); while (len) { - if (wait_for(I915_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_RDY), 50)) + if (wait_for(I915_READ(reg + 2) & (GMBUS_SATOER | GMBUS_HW_RDY), 50)) goto timeout; - if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER) + if (I915_READ(reg + 2) & GMBUS_SATOER) goto clear_err; val = loop = 0; @@ -294,14 +299,15 @@ gmbus_xfer(struct i2c_adapter *adapter, val |= *buf++ << (8 * loop); } while (--len && ++loop < 4); - I915_WRITE(GMBUS3 + reg_offset, val); - POSTING_READ(GMBUS2+reg_offset); + I915_WRITE(reg + 3, val); + POSTING_READ(reg + 2); } } - if (i + 1 < num && wait_for(I915_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_WAIT_PHASE), 50)) + if (i + 1 < num && + wait_for(I915_READ(reg + 2) & (GMBUS_SATOER | GMBUS_HW_WAIT_PHASE), 50)) goto timeout; - if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER) + if (I915_READ(reg + 2) & GMBUS_SATOER) goto clear_err; } @@ -312,22 +318,23 @@ clear_err: * of resetting the GMBUS controller and so clearing the * BUS_ERROR raised by the slave's NAK. */ - I915_WRITE(GMBUS1 + reg_offset, GMBUS_SW_CLR_INT); - I915_WRITE(GMBUS1 + reg_offset, 0); + I915_WRITE(reg + 1, GMBUS_SW_CLR_INT); + I915_WRITE(reg + 1, 0); done: /* Mark the GMBUS interface as disabled. We will re-enable it at the * start of the next xfer, till then let it sleep. */ - I915_WRITE(GMBUS0 + reg_offset, 0); + I915_WRITE(reg + 0, 0); return i; timeout: DRM_INFO("GMBUS timed out, falling back to bit banging on pin %d [%s]\n", bus->reg0 & 0xff, bus->adapter.name); - I915_WRITE(GMBUS0 + reg_offset, 0); + intel_i2c_reset(dev_priv->dev); - /* Hardware may not support GMBUS over these pins? Try GPIO bitbanging instead. */ + /* Hardware may not support GMBUS over these pins? + * Try GPIO bitbanging instead. */ bus->force_bit = intel_gpio_create(dev_priv, bus->reg0 & 0xff); if (!bus->force_bit) return -ENOMEM;