drm/i915/csr: Allow matching unknown HW steppings with generic firmware

If the firmware is generic and has a run-anywhere mode, enable it rather
than completely failing on unknown HW revisions.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Damien Lespiau <damien.lespiau@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Sunil Kamath <sunil.kamath@intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Animesh Manna <animesh.manna@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1457352357-8433-1-git-send-email-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
index d417d9ab49b5bba254362ce9d11cca1680f80e6f..3f57cb94d9ad3de331805c86e877fd6e9759d1b6 100644 (file)
--- a/drivers/gpu/drm/i915/intel_csr.c
+++ b/drivers/gpu/drm/i915/intel_csr.c
@@ -188,28 +188,31 @@ static const struct stepping_info bxt_stepping_info[] = {
        {'B', '0'}, {'B', '1'}, {'B', '2'}
 };
 
-static const struct stepping_info *intel_get_stepping_info(struct drm_device *dev)
+static const struct stepping_info no_stepping_info = { '*', '*' };
+
+static const struct stepping_info *
+intel_get_stepping_info(struct drm_i915_private *dev_priv)
 {
        const struct stepping_info *si;
        unsigned int size;
 
-       if (IS_KABYLAKE(dev)) {
+       if (IS_KABYLAKE(dev_priv)) {
                size = ARRAY_SIZE(kbl_stepping_info);
                si = kbl_stepping_info;
-       } else if (IS_SKYLAKE(dev)) {
+       } else if (IS_SKYLAKE(dev_priv)) {
                size = ARRAY_SIZE(skl_stepping_info);
                si = skl_stepping_info;
-       } else if (IS_BROXTON(dev)) {
+       } else if (IS_BROXTON(dev_priv)) {
                size = ARRAY_SIZE(bxt_stepping_info);
                si = bxt_stepping_info;
        } else {
-               return NULL;
+               size = 0;
        }
 
-       if (INTEL_REVID(dev) < size)
-               return si + INTEL_REVID(dev);
+       if (INTEL_REVID(dev_priv) < size)
+               return si + INTEL_REVID(dev_priv);
 
-       return NULL;
+       return &no_stepping_info;
 }
 
 static void gen9_set_dc_state_debugmask(struct drm_i915_private *dev_priv)
@@ -270,13 +273,11 @@ void intel_csr_load_program(struct drm_i915_private *dev_priv)
 static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
                              const struct firmware *fw)
 {
-       struct drm_device *dev = dev_priv->dev;
        struct intel_css_header *css_header;
        struct intel_package_header *package_header;
        struct intel_dmc_header *dmc_header;
        struct intel_csr *csr = &dev_priv->csr;
-       const struct stepping_info *stepping_info = intel_get_stepping_info(dev);
-       char stepping, substepping;
+       const struct stepping_info *si = intel_get_stepping_info(dev_priv);
        uint32_t dmc_offset = CSR_DEFAULT_FW_OFFSET, readcount = 0, nbytes;
        uint32_t i;
        uint32_t *dmc_payload;
@@ -284,14 +285,6 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
        if (!fw)
                return NULL;
 
-       if (!stepping_info) {
-               DRM_ERROR("Unknown stepping info, firmware loading failed\n");
-               return NULL;
-       }
-
-       stepping = stepping_info->stepping;
-       substepping = stepping_info->substepping;
-
        /* Extract CSS Header information*/
        css_header = (struct intel_css_header *)fw->data;
        if (sizeof(struct intel_css_header) !=
@@ -303,7 +296,7 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
 
        csr->version = css_header->version;
 
-       if ((IS_SKYLAKE(dev) || IS_KABYLAKE(dev)) &&
+       if ((IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) &&
            csr->version < SKL_CSR_VERSION_REQUIRED) {
                DRM_INFO("Refusing to load old Skylake DMC firmware v%u.%u,"
                         " please upgrade to v%u.%u or later"
@@ -331,11 +324,11 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
        /* Search for dmc_offset to find firware binary. */
        for (i = 0; i < package_header->num_entries; i++) {
                if (package_header->fw_info[i].substepping == '*' &&
-                   stepping == package_header->fw_info[i].stepping) {
+                   si->stepping == package_header->fw_info[i].stepping) {
                        dmc_offset = package_header->fw_info[i].offset;
                        break;
-               } else if (stepping == package_header->fw_info[i].stepping &&
-                       substepping == package_header->fw_info[i].substepping) {
+               } else if (si->stepping == package_header->fw_info[i].stepping &&
+                          si->substepping == package_header->fw_info[i].substepping) {
                        dmc_offset = package_header->fw_info[i].offset;
                        break;
                } else if (package_header->fw_info[i].stepping == '*' &&
@@ -343,7 +336,8 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
                        dmc_offset = package_header->fw_info[i].offset;
        }
        if (dmc_offset == CSR_DEFAULT_FW_OFFSET) {
-               DRM_ERROR("Firmware not supported for %c stepping\n", stepping);
+               DRM_ERROR("Firmware not supported for %c stepping\n",
+                         si->stepping);
                return NULL;
        }
        readcount += dmc_offset;
@@ -389,9 +383,7 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
                return NULL;
        }
 
-       memcpy(dmc_payload, &fw->data[readcount], nbytes);
-
-       return dmc_payload;
+       return memcpy(dmc_payload, &fw->data[readcount], nbytes);
 }
 
 static void csr_load_work_fn(struct work_struct *work)